Data Validators

Validate TOML configuration files for syntax errors, duplicate keys, invalid values, and specification compliance with detailed error messages - Free online TOML validator

Validate JavaScript source code for syntax structure errors, unmatched tokens, unterminated strings/comments, and parser-level issues with line diagnostics - Free online JavaScript syntax validator

Validate Python source code for indentation mistakes, unmatched tokens, unterminated strings, and structural syntax issues with line diagnostics - Free online Python syntax validator

Validate shell scripts for parser-level syntax issues including unclosed blocks, unmatched tokens, and structure mistakes with line diagnostics - Free online shell script syntax checker

Validate TOON (Token-Oriented Object Notation) files for syntax errors, array count mismatches, invalid escape sequences, and specification compliance - Free online TOON validator

Validate YAML files for syntax errors, indentation issues, duplicate keys, anchors/aliases problems, and structure violations with line-level feedback - Free online YAML validator

Detect repeated mapping keys in YAML files with line and column conflict diagnostics to prevent silent overwrite bugs - Free online YAML duplicate key detector

Validate YAML anchors, aliases, and merge-key inheritance for undefined references, duplicate anchors, and configuration reuse safety - Free online YAML anchors and aliases validator

Validate JSON payloads against schema rules including required fields, type checks, ranges, enums, and additionalProperties constraints - Free online JSON schema validator

Detect repeated object keys in JSON payloads with conflict location diagnostics to prevent silent overwrites - Free online JSON duplicate key detector

Validate XML and XSD schema structure for namespace declaration, element declaration conflicts, schema include/import issues, and line-level diagnostics - Free online XML XSD validator

Validate XML structural syntax for tag nesting, closing tag correctness, entity usage, and parser-level well-formedness with line diagnostics - Free online XML well-formedness checker

Validate INI configuration files for syntax errors, duplicate sections, duplicate keys, invalid section headers, and INI format compliance - Free online INI validator

Validate HOCON configuration files for syntax errors, mismatched braces, invalid substitutions, duplicate keys, and HOCON specification compliance - Free online HOCON validator

Validate CSV row and column structure for field count consistency, quoting correctness, delimiter issues, and RFC 4180 compliance - Free online CSV structure validator

Validate TSV row and column structure for tab-delimited consistency, malformed lines, and import-readiness issues - Free online TSV structure validator

Validate ENV and dotenv files for invalid key names, duplicate keys, quoting errors, escape sequence issues, and naming convention compliance - Free online ENV file validator

Validate HTML files for unclosed tags, invalid nesting, missing attributes, deprecated elements, and HTML5 compliance - Free online HTML validator

Run a fast accessibility audit for HTML pages and snippets. Detect missing alt text, unlabeled controls, heading order jumps, missing landmarks, and weak link/button labels - Free online accessibility checker

Validate CSS stylesheets for syntax errors, unclosed blocks, invalid properties, malformed selectors, and structural issues - Free online CSS validator

Validate RSS 2.0 and Atom 1.0 feeds for syntax errors, missing required elements, invalid dates, and structural issues - Free online feed validator

Validate robots.txt files for syntax errors, invalid directives, path issues, sitemap URLs, crawl-delay values, and structural best practices - Free online robots.txt validator

Explain robots.txt Allow/Disallow conflicts with longest-match precedence analysis, wildcard overlap diagnostics, and user-agent group conflict insights - Free robots txt conflict checker

Validate sitemap XML files and sitemap index files for XML errors, missing elements, invalid URLs, date format issues, and protocol compliance - Free online sitemap validator

Split large sitemap XML files into protocol-compliant chunk files with 50,000 URL awareness, byte-size controls, and automatic sitemap index generation - Free online sitemap splitter

Validate Open Graph meta tags for required property coverage, URL quality, duplicate properties, and social preview readiness - Free online Open Graph validator

Optimize og:title and og:description copy for social preview length, truncation risk, and keyword alignment before publishing - Free og title description length checker

Build campaign URLs with standardized UTM naming rules to keep attribution dimensions clean across channels and teams - Free online UTM parameter builder

Remove UTM tracking parameters, clean click IDs, and normalize query strings for share-ready URLs and cleaner SEO audits - Free online UTM URL cleaner

Validate Twitter Card meta tags for required field coverage, card type quality, and media URL readiness - Free online Twitter card validator

Check CORS preflight request and response compatibility for origin mismatch, credential conflicts, method/header coverage, private network rules, and preflight status issues - Free online CORS preflight checker

Debug service worker registration context for scope mismatches, HTTPS requirements, script MIME type issues, response status problems, and cache-related update delays - Free online service worker debugger

Debug module import resolution for alias mismatches, unsafe relative paths, and candidate extension resolution pitfalls - Free online import path resolver debugger

Classify browser console logs into CORS, network, runtime, source-map, and promise-rejection categories with line-aware diagnostics - Free online browser console error classifier

Decode JavaScript runtime failures into actionable error classes with likely causes and practical first-fix guidance - Free online JavaScript runtime error decoder

Explain JavaScript stack traces to identify actionable frames, recursion patterns, and runtime debugging direction - Free online JavaScript stack trace explainer

Analyze obfuscated stack traces to detect sourcemap failures, prioritize actionable frames, and accelerate crash debugging - Free online stack trace deobfuscation helper

Generate root-cause investigation checklists from runtime stack traces with probable fault domains, triage steps, and remediation workflow guidance - Free stack trace analyzer online

Decode TypeScript compiler type errors into likely causes and practical first-fix guidance - Free online TypeScript type error explainer

Explain Python traceback output to find actionable frames and likely exception causes - Free online Python traceback explainer

Decode Java compiler diagnostics into likely causes and practical first-fix guidance - Free online Java compiler error explainer

Decode GCC/Clang compile and linker diagnostics into likely causes and first-fix guidance - Free online C compiler error explainer

Decode G++/Clang++ compile and linker diagnostics into likely causes and first-fix guidance - Free online C++ compiler error explainer

Decode dotnet build and MSBuild diagnostics into likely causes and first-fix guidance - Free online C# build error explainer

Decode Go build and test diagnostics into likely causes and first-fix guidance - Free online Go build error explainer

Decode cargo and rustc diagnostics into likely causes and first-fix guidance - Free online Rust compiler error explainer

Decode PHP warnings, notices, and fatal runtime errors into likely causes and first-fix guidance - Free online PHP error message explainer

Decode Ruby exceptions and traceback diagnostics into likely causes and first-fix guidance - Free online Ruby error message explainer

Decode Kotlin compiler and Gradle diagnostics into likely causes and first-fix guidance - Free online Kotlin compiler error explainer

Decode Swift compiler and Xcode diagnostics into likely causes and first-fix guidance - Free online Swift compiler error explainer

Decode dart analyze and flutter analyzer diagnostics into likely causes and first-fix guidance - Free online Dart analyzer error explainer

Decode SQL parser and database diagnostics into likely causes and practical first-fix guidance - Free online SQL syntax error explainer

Validate SQL query syntax, catch risky query patterns, and review SQL diagnostics with line-aware feedback - Free online SQL query validator

Detect costly SQL anti-patterns, lock-contention hints, and optimization opportunities from query text and diagnostics - Free online SQL performance smell checker

Generate practical SQL index suggestions from query access patterns and existing index coverage hints - Free online SQL index suggestion tool

Convert LIMIT/OFFSET SQL pagination to cursor-based query guidance with stable ordering and index hints - Free online offset to cursor pagination helper

Validate and repair JSONL line-by-line with safe fixes and clean NDJSON output for pipelines and logs - Free jsonl validator online

Convert NDJSON and JSONL records into clean CSV output with nested-field flattening and delimiter controls - Free ndjson to csv converter

Map CSV headers to JSON Schema properties with type inference and required-field strategies - Free csv to json schema tool

Find duplicate rows in CSV files using full-row or selected-key matching with grouped export output - Free find duplicate rows csv tool

Detect personally identifiable information in CSV columns using header and value-pattern analysis with confidence scores - Free detect pii in csv tool

Preview YAML output after env variable expansion with defaults and unresolved placeholder diagnostics - Free yaml env variable substitution tool

Resolve Git conflict markers in .env files with merge strategy controls and duplicate-key cleanup - Free merge env files tool

Test .gitignore rules against file and directory paths with line-aware rule tracing, negation checks, and parent-directory block diagnostics - Free online gitignore pattern tester

Validate Git branch names against naming conventions, prefix policies, ticket formats, and Git ref safety constraints with line-aware diagnostics - Free online branch naming convention checker

Detect CSS cascade override risks, specificity spikes, duplicate selectors, and !important overuse with line-aware guidance - Free online CSS specificity conflict checker

Visualize CSS selector specificity tuples, cascade weight distribution, and high-risk selector patterns with ranked diagnostics - Free online css specificity calculator

Detect and resolve conflicting Tailwind utility classes with variant-aware override tracing and cleanup-ready output - Free online tailwind class conflict checker

Test JSONPath expressions against JSON payloads with path-level matches, wildcard and recursive descent support, and syntax diagnostics - Free online jsonpath tester

Test XPath expressions against XML payloads with path-level matches, attribute and text-node predicates, and syntax diagnostics - Free online xpath tester

Parse log streams, classify severity, and group recurring error signatures for faster debugging and incident triage - Free online log parser and error grouper

Analyze server logs to classify severity, group recurring failures, and surface backend incident hotspots - Free online server log analyzer

Validate source map JSON structure, mappings quality, and source path consistency for production-debug readiness - Free online source map validator

Analyze redirect mappings and logs to detect loops, long redirect chains, and migration issues that impact crawl efficiency - Free online redirect chain checker

Test and simulate Nginx and Apache redirect rules to catch loops, chain bloat, and syntax mistakes before deployment - Free online redirect rule tester

Validate canonical tags and URL mappings for conflicts, non-HTTPS targets, and canonical normalization issues that affect SEO indexing - Free online canonical url checker

Test meta robots and X-Robots-Tag directives for indexing conflicts, invalid values, and crawler-policy consistency issues - Free online meta robots checker

Validate hreflang tags and locale URL mappings for invalid language-region codes, conflicting targets, and missing x-default fallback - Free online hreflang validator

Validate reciprocal hreflang return links across locale pages to detect missing back-links, language mismatches, and conflicting alternate targets - Free hreflang return tag checker

Find orphan pages from URL inventories and internal-link mappings to improve crawl discovery, indexation quality, and technical SEO health - Free online orphan page finder

Detect repeated lines and duplicate content blocks for SEO audits, editorial QA, and migration cleanup - Free online duplicate content finder

Compare page content blocks to detect overlapping keyword targeting and internal ranking competition - Free online keyword cannibalization checker

Detect circular dependency loops in directed module edge lists to improve architecture stability - Free online circular dependency detector

Analyze timestamp and date parsing inputs for timezone ambiguity, mixed formats, and cross-region runtime pitfalls - Free online timezone bug analyzer

Check timestamps and date parsing inputs for timezone ambiguity, mixed formats, and DST-related runtime pitfalls - Free online timezone bug checker

Detect ambiguous datetime parsing patterns, mixed date formats, and runtime-specific parsing pitfalls - Free online date parsing bug checker

Decode and validate JWT tokens for malformed segments, Base64URL decoding issues, claim timestamp problems, expired tokens, and auth security pitfalls - Free online JWT decoder and validator

Calculate exact JWT expiration countdown from exp claims and diagnose token lifetime issues with UTC and local timestamps - Free online JWT expiry countdown calculator

Scan code, logs, and config snippets for exposed API keys, private key blocks, leaked tokens, and credentialed URLs with actionable remediation guidance - Free online secret exposure scanner

Validate OAuth callback URLs for malformed URI syntax, insecure schemes, wildcard misuse, fragment mistakes, and registration mismatch issues - Free online OAuth redirect URI validator

Compare required and granted OAuth scopes to detect missing permissions, extra token privileges, and authorization scope drift - Free online OAuth scope comparator

Generate secure CSP nonce and hash tokens for inline script and style sources to harden Content-Security-Policy headers - Free online CSP nonce and hash generator

Detect insecure HTTP assets in HTML, CSS, headers, and logs that can trigger browser blocking on HTTPS pages - Free online mixed content checker

Analyze SSL certificate metadata for expiry risk, weak signature algorithms, key-size posture, SAN coverage, and deployment readiness - Free online SSL certificate health checker

Validate DNS zone records for syntax errors, CNAME conflicts, MX and host target issues, SPF duplication, and DMARC policy gaps - Free online DNS record validator

Validate SPF TXT records for syntax mistakes, unsafe all policy usage, duplicate SPF entries, and sender-authorization quality - Free online SPF record validator

Estimate SPF flattening risk using DNS lookup count, include-chain depth, unresolved references, and permerror exposure before TXT deployment - Free online SPF flatten checker

Validate DKIM TXT records for syntax errors, missing required tags, key-format quality, and selector deployment readiness - Free online DKIM record validator

Plan DKIM selector naming, key rotation cadence, overlap windows, and reserve capacity using actionable DKIM selector best practices - Free online DKIM selector planning helper

Build a phased DMARC rollout plan with p and pct escalation, alignment hardening, reporting checks, and operational risk scoring - Free online DMARC policy rollout planner

Validate DMARC TXT records for syntax quality, p/sp policy correctness, alignment posture, and reporting URI configuration - Free online DMARC record validator

Analyze email subject lines for mobile and desktop truncation risk, spam-like wording, readability quality, and rewrite opportunities - Free online email subject line checker

Count SMS characters and estimate GSM-7 versus Unicode segment split with boundary diagnostics and rewrite suggestions - Free online SMS character counter

Format phone numbers to E.164 with country-prefix handling, extension cleanup, and line-by-line diagnostics - Free online e164 phone formatter

Split long shipping addresses into structured address lines with unit handling and overflow diagnostics - Free online split address lines tool

Validate VAT number format by country with prefix normalization, syntax diagnostics, and canonical VAT output - Free online vat number format checker

Validate IBAN format with country-length rules, checksum diagnostics, and canonical formatting output - Free online iban format checker

Check GST invoice number patterns for prefix policy, fiscal-year token usage, duplicate risks, and sequence consistency - Free online gst invoice format checker

Generate QR code payload strings for URL, WiFi, and vCard formats with syntax checks and scan-readiness diagnostics - Free qr code payload generator

Simulate short URL slug availability with reserved route checks, duplicate detection, and alternative suggestions - Free short url slug checker

Generate password policy regex patterns with configurable length and character requirements, then test sample passwords - Free password regex generator

Analyze consent and privacy text readability using reading-ease scores, grade-level insights, and legal-jargon diagnostics - Free privacy policy readability checker

Map cookie inventory entries into compliance-ready categories with confidence scoring, unknown-cookie alerts, and purpose-signal checks - Free cookie categories compliance tool

Compare policy versions with section-level added, removed, and changed clauses plus sensitive-term diagnostics - Free tool to compare privacy policy versions

Analyze URL inventories to discover contextual internal linking opportunities with overlap scoring and anchor suggestions - Free internal linking tool seo assistant

Test title templates against variable rows to catch duplicate outputs, keyword gaps, and truncation risks before publish - Free seo title template generator QA tool

Generate click-focused meta description variants with keyword coverage, duplicate checks, and SERP-length diagnostics - Free meta description generator seo tool

Classify keywords into informational, navigational, commercial, transactional, local, and mixed intent with confidence diagnostics - Free keyword intent classifier

Build keyword clusters using strategic modifiers with duplicate checks, collision alerts, and intent-focused grouping diagnostics - Free keyword clustering tool

Convert FAQ question and answer content into FAQPage JSON-LD with duplicate checks and schema-quality diagnostics - Free faq schema generator

Generate HowTo JSON-LD from instructional steps with duplicate checks, optional tools and supplies, and schema diagnostics - Free howto schema generator

Generate BreadcrumbList JSON-LD from breadcrumb paths with URL validation, duplicate checks, and script-ready output - Free breadcrumb schema generator

Validate Organization JSON-LD for required fields, logo and sameAs quality, URL format, and schema consistency diagnostics - Free organization schema validator

Validate Product JSON-LD completeness for required commerce fields, offer quality, URL integrity, and rich-result readiness - Free product schema checker

Check review schema eligibility with aggregateRating validation, metadata quality checks, and policy-risk diagnostics - Free review schema validator

Compare Name Address Phone data across listings to detect citation mismatches and improve local SEO trust - Free NAP consistency checker

Count Apple App Store and Google Play metadata field lengths to catch overflow risk and ASO submission errors - Free app store character counter

Format YouTube chapter timestamps from messy notes, validate chapter order, and generate copy-ready description timelines - Free YouTube timestamp generator

Clean rough transcripts by fixing punctuation, capitalization, filler noise, and repeated words with timestamp-aware processing - Free transcript cleaner

Shift SRT subtitle timestamps forward or backward with millisecond precision, overlap diagnostics, and clamp-to-zero safety - Free SRT timestamp adjuster

Extract structured tasks from meeting notes with owner checks, due-date diagnostics, priority inference, and dedupe support - Free action item extractor

Convert plain process text into SOP checklist steps with owner checks, verification guidance, and risk-aware output - Free SOP checklist generator

Parse user-agent strings into browser, OS, device, bot, and spoofing-risk summaries with confidence diagnostics - Free user agent parser online

Calculate subnet masks, network ranges, usable hosts, wildcard masks, and private/public CIDR diagnostics - Free CIDR range calculator

Generate an accurate subnet mask calculator cheat sheet from prefixes, masks, and CIDR input with host-capacity details - Free subnet mask cheat generator

Validate DNS propagation outputs for inconsistent resolver answers, stale cache signals, TTL delays, and regional rollout gaps - Free online domain propagation checker

Estimate DNS propagation completion time from resolver samples, TTL values, answer drift, and failure signals - Free dns propagation time checker

Generate status page updates for investigating, identified, monitoring, and resolved phases with customer-safe wording and timeline-aware context - Free incident update template generator

Score support tickets with urgency, impact scope, customer tier, aging, and SLA risk context for faster triage decisions - Free support ticket priority matrix tool

Analyze prompts and transcripts for instruction-override attacks, role escalation attempts, secret-exfiltration cues, and unsafe tool-use coercion - Free online prompt injection risk checker

Validate webhook signature headers for provider format issues, timestamp replay-window risks, payload consistency pitfalls, and signing-secret readiness - Free online webhook signature validator

Validate payment webhook event payloads for event id, event type format, timestamp sanity, and provider payload readiness - Free online payment webhook event validator

Analyze API rate-limit headers for numeric errors, reset ambiguity, retry-after issues, and RFC versus legacy throttling header consistency - Free online rate limit analyzer

Inspect HTTP response headers for security directives, cache consistency, cookie attributes, and protocol-level mistakes - Free online HTTP headers inspector

Compare baseline and target HTTP headers to detect added, removed, and changed values across environments with line-aware diagnostics - Free online HTTP header diff checker

Compare cache update precision, topology, and personalization factors to choose ETag, Last-Modified, or dual-validator HTTP strategy - Free etag last modified difference helper

Choose the best service worker runtime caching strategy using resource behavior, freshness constraints, offline goals, and cache budget inputs - Free service worker caching strategy tool

Validate GraphQL schema SDL for syntax, type references, duplicate definitions, root schema wiring, and diagnostics hints - Free online GraphQL schema validator

Estimate GraphQL query complexity using field depth, fan-out patterns, fragments, directives, and operation type weighting - Free online GraphQL query cost estimator

Check REST API endpoint paths for mixed naming styles, inconsistent parameter notation, versioning drift, trailing slash inconsistency, and verb-based route anti-patterns - Free REST endpoint naming conventions checker

Choose the right API versioning approach using exposure model, breaking-change cadence, cache behavior, client control, and migration risk insights - Free API versioning strategy tool

Validate Redis key naming standards for delimiter consistency, prefix policy, segment depth, wildcard safety, and duplicate-key drift - Free Redis key naming checker

Sanitize Kubernetes resource names against DNS subdomain, RFC 1123 label, and RFC 1035 label rules with collision-aware diagnostics - Free Kubernetes name validator

Validate Kubernetes labels and annotations for key syntax, value constraints, reserved-prefix safety, and duplicate metadata conflicts - Free Kubernetes metadata validator

Compare baseline and target Helm values.yaml files to detect added, removed, changed, and critical release-impact drift - Free compare Helm values files tool

Compare Terraform variable declarations against tfvars assignments to detect missing required inputs, unknown keys, and duplicate assignment drift - Free Terraform missing variables checker

Validate Terraform resource, module, variable, and output labels for naming-style consistency, duplicate identifier collisions, and policy compliance - Free terraform naming convention validator

Calculate DNS TTL strategy from current records, change cadence, rollback urgency, and migration window constraints - Free dns ttl calculator

Validate Protocol Buffer (.proto) schemas for syntax issues, field-number conflicts, enum/service issues, naming violations, and proto2/proto3 rule mismatches - Free online Protobuf syntax validator

Check Protocol Buffer (.proto) messages for unreserved field-number gaps, duplicate field numbers, and numbering compatibility risks - Free online Protobuf field number checker

Validate and lint Dockerfiles for syntax errors, best-practice violations, security issues, deprecated instructions, multi-stage build problems, and common anti-patterns - Free online Dockerfile linter

Validate docker-compose.yml files for service definitions, port conflicts, volume/network references, dependency ordering, environment variables, and best-practice violations - Free online Docker Compose validator

Validate Nginx configuration files for syntax errors, SSL/TLS issues, proxy misconfigurations, security vulnerabilities, and best-practice violations - Free online Nginx validator

Validate Apache httpd.conf and .htaccess files for syntax errors, container mismatches, SSL/TLS issues, deprecated directives, security vulnerabilities, and best-practice violations - Free online Apache validator

Validate Caddyfile configurations for syntax errors, block mismatches, reverse proxy mistakes, TLS issues, and best-practice violations - Free online Caddy validator

Validate HAProxy config files for syntax errors, section wiring issues, backend reference mistakes, bind/server problems, and operational best-practice gaps - Free online HAProxy config validator

Validate Terraform HCL for syntax issues, security anti-patterns, duplicate blocks, and infrastructure best-practice gaps - Free online Terraform HCL validator

Decode Terraform plan/apply diagnostics into likely causes and practical first-fix suggestions for faster infrastructure incident triage - Free online Terraform plan error explainer

Validate Kubernetes YAML manifests for syntax errors, missing fields, apiVersion/kind issues, container configuration, resource limits, and best-practice violations - Free online Kubernetes YAML validator

Validate Helm values YAML for key syntax issues, duplicate paths, risky secret handling, service type mismatches, and deployment best-practice gaps - Free online Helm values validator

Validate GitHub Actions workflow YAML for syntax errors, trigger events, job configuration, step validation, circular dependencies, cron schedules, and permissions - Free online GHA validator

Validate .gitlab-ci.yml for syntax errors, stage mismatches, missing script blocks, and job dependency issues - Free online GitLab CI YAML validator

Validate Jenkins pipeline config for syntax errors, missing pipeline blocks, malformed stage declarations, and CI reliability issues - Free online Jenkinsfile validator

Validate Prettier configuration files for syntax errors, invalid option values, malformed overrides, and quality warnings - Free online .prettierrc validator

Validate ESLint configuration files for syntax errors, invalid rule severity values, malformed overrides, and schema mismatches - Free online .eslintrc validator

Validate Stylelint configuration files for syntax errors, invalid top-level key types, malformed rules, and override schema issues - Free online .stylelintrc validator

Validate PostCSS configuration for syntax errors, plugin map issues, parser and map option mistakes, and config warnings - Free online postcss config validator

Validate Vite configuration files for syntax errors, invalid option types, malformed build/server blocks, and schema mismatches - Free online vite.config validator

Validate Next.js configuration files for syntax errors, invalid option types, malformed nested settings, and schema mismatches - Free online next.config validator

Validate Webpack configuration files for syntax errors, invalid option types, malformed module rules, output and resolve mistakes, and schema mismatches - Free online webpack.config validator

Validate Rollup configuration files for syntax errors, invalid option types, malformed output blocks, treeshake mismatches, and schema mistakes - Free online rollup.config validator

Validate tsconfig.json files for syntax errors, invalid compilerOptions values, malformed references, and TypeScript configuration mistakes - Free online tsconfig validator

Validate Makefile targets and dependency graphs for syntax errors, TAB-indentation issues, unresolved dependencies, duplicate targets, and circular chains - Free online Makefile checker

Troubleshoot CMakeLists.txt for syntax errors, block mismatches, unknown commands, target-reference mistakes, and configure-step failures - Free online CMake troubleshooter

Validate Ansible playbook YAML for syntax errors, play structure, task modules, handler references, privilege escalation, Jinja2 expressions, deprecated modules, and best practices - Free online Ansible validator

Lint Markdown files with fix-assistant guidance for heading structure, link syntax, image alt text, code blocks, list formatting, table alignment, and CI-ready quality checks - Free online markdown lint assistant

Check pasted markdown for broken links, unresolved reference IDs, missing heading anchors, duplicate URLs, and insecure HTTP patterns - Free online markdown link checker

Audit markdown heading hierarchy for skipped levels, duplicate headings, multi-H1 policy violations, and depth/readability issues with line-aware diagnostics - Free online markdown heading checker

Check README markdown against required and recommended documentation sections with coverage scoring, strict checklist mode, and policy-section diagnostics - Free online README checklist tool

Rewrite raw API errors into user-friendly messages with category-based phrasing, next-step guidance, and sanitized debug hints - Free online API error rewriter

Validate ads.txt files for format errors, invalid domains, account types (DIRECT/RESELLER), duplicate entries, TAG-ID certification authority IDs, and IAB specification compliance - Free online ads.txt validator

Validate app-ads.txt files for format errors, invalid seller records, DIRECT/RESELLER issues, duplicate entries, and mobile inventory authorization compliance - Free online app-ads.txt validator

Validate Google Analytics 4 setup snippets for measurement ID format, gtag initialization, config calls, GTM integration quality, and consent-mode readiness - Free online GA4 setup validator

Validate GA4 event names for naming limits, allowed characters, reserved prefixes, duplicate conflicts, and analytics taxonomy consistency - Free online GA4 event naming validator

Validate Google Consent Mode implementation for default/update calls, v2 consent keys, granted/denied value correctness, and setup completeness - Free online consent mode validator

Validate cookie consent banner snippets for accept/reject actions, preference controls, policy links, consent persistence, and pre-consent script loading signals - Free online cookie banner compliance checker

Validate Set-Cookie headers for Secure, HttpOnly, SameSite, __Host-/__Secure- prefix constraints, Domain and Path scope issues, and browser compatibility rules - Free secure cookie flags checker

Validate Schema.org JSON-LD markup for syntax quality, missing @context/@type fields, graph shape issues, and rich-result readiness - Free online structured data validator

Validate manifest.webmanifest JSON for installability-critical fields, icon requirements, scope and display behavior, and platform compatibility signals - Free online PWA manifest validator

Validate package.json dependencies for risky versions, deprecated packages, unsafe scripts, and reproducibility gaps - Free online dependency health checker

Validate JSON-LD structured data for JSON syntax errors, Schema.org type validation, missing properties, @graph support, and Google rich results eligibility - Free online JSON-LD validator

Validate semantic version strings against Semver 2.0.0 specification for correct MAJOR.MINOR.PATCH format, pre-release identifiers, build metadata, leading zeros, and range expressions - Free online semver validator

Compare two semantic version range expressions, compute exact overlap branches, and test candidate versions for package compatibility planning - Free online semver range checker

Calculate fluid typography clamp() formulas from viewport and font-size ranges with rem/px output and fallback CSS snippets - Free css clamp calculator

Calculate Node.js heap memory recommendations from host or container limits, worker process count, and runtime headroom assumptions - Free node heap memory calculator

Plan LCP, INP, and CLS aligned JavaScript, CSS, image, and third-party payload budgets for release-safe performance goals - Free core web vitals budget calculator

Validate UUID and GUID strings against RFC 4122 and RFC 9562 for correct 8-4-4-4-12 hex format, version nibble, variant bits, nil/max UUID detection, and multiple input formats - Free online UUID validator

Inspect UUID and GUID values for version nibble, variant bits, RFC compliance, duplicate detection, and format consistency - Free online UUID version checker

Validate cron schedule expressions for 5-field syntax correctness, ranges, steps, aliases, macros, and common scheduling pitfalls - Free online cron expression validator

Translate cron expressions to plain-English schedule text with field-by-field breakdowns, macro support, and compatibility diagnostics - Free online cron translator

Find overlap windows for global meetings using UTC offsets, local work hours, duration, and slot steps - Free online timezone overlap calculator

Normalize mixed date strings, epoch timestamps, and timezone-missing datetimes into canonical ISO 8601 output - Free online ISO date normalizer

Convert epoch milliseconds, epoch seconds, and datetime strings with explicit UTC offset handling and line-by-line diagnostics - Free online epoch milliseconds converter

Generate SEO-friendly slugs from titles using separator control, lowercase rules, max-length trimming, and duplicate slug diagnostics - Free online slug generator

Sanitize filenames for Windows, macOS, Linux, and browser upload safety by removing invalid characters, fixing reserved names, and enforcing length limits - Free online filename sanitizer

Convert mixed identifiers into snake_case, camelCase, kebab-case, and PascalCase with bulk input and naming diagnostics - Free online case converter for developers

Compare baseline and target JSON or YAML configs to highlight added, removed, and changed paths with structured diagnostics - Free online config diff highlighter

Redact API keys, tokens, private key blocks, and credentialed URLs from logs with configurable masking rules - Free online secret redaction helper

Calculate reset timestamps, retry windows, and quota pacing from RateLimit and X-RateLimit headers - Free online rate limit reset calculator

Calculate exponential retry delays with full, equal, and decorrelated jitter, max-delay caps, and cumulative wait timing - Free online exponential backoff calculator

Simulate webhook delivery retry timing with exponential backoff, jitter modes, delay caps, and UTC attempt schedules - Free online webhook retry strategy calculator

Generate and evaluate idempotency key strategies with deterministic scoping, payload fingerprinting, retention tuning, and replay-risk diagnostics - Free online idempotency key generator

Explain regular expressions in plain English and test them against sample text with match positions, capture-group reporting, and beginner-friendly diagnostics - Free regex explainer online

Create regex from text requirements using plain-English prompts, sample match testing, confidence scoring, and rule diagnostics - Free regex generator online

Validate Lua scripts for syntax errors, unmatched blocks, malformed literals, and parser-level issues with line-aware diagnostics - Free online Lua syntax validator