Does the converter support Basic Auth (-u flag)?

Yes. The -u user:pass or --user user:pass flag is automatically converted to an Authorization: Basic header using btoa(user:pass). The base64 encoding is computed at conversion time and embedded directly in the generated code.

cURL to fetch Converter

Convert cURL commands to browser fetch or Axios JavaScript/TypeScript code online for free. Supports -X, -H, -d, -u, --data-raw, --compressed, and all common cURL flags — choose between fetch promise, fetch async/await, Axios promise, or Axios async/await output. No signup needed — all conversion runs locally in your browser.

Paste a cURL command and click Convert. The converter parses all common cURL flags and generates equivalent browser fetch or Axios JavaScript/TypeScript code. All conversion runs locally in your browser.

Output Style

Language

cURL Command

Quick examples:

Why Use Our cURL to fetch Converter?

Fast, accurate cURL to JavaScript conversion with full flag support

Instant cURL to fetch Conversion

Convert any cURL command to browser fetch or Axios code instantly. Paste your cURL command and get clean, ready-to-use JavaScript or TypeScript in milliseconds — no waiting, no build steps.

Secure cURL to fetch Converter Online

All cURL to fetch conversion happens locally in your browser — your commands and API tokens never leave your device. Use our cURL to fetch converter online with complete privacy and zero data collection.

cURL to fetch Converter Online — No Installation

Convert cURL to fetch directly in any browser with no Node.js, npm, or build tool setup required. Works on any device, anywhere — just paste and convert.

Full cURL Flag Support

Our converter supports all common cURL flags: -X (method), -H (headers), -d / --data-raw (body), -u (Basic Auth), --compressed, -L (redirects), -k (insecure), and multi-line cURL with backslash continuation.

Common Use Cases for cURL to fetch Converter

Practical scenarios where our cURL to fetch converter saves time

API Integration Development

Convert cURL examples from API documentation directly to fetch code. Most REST API docs provide cURL samples — paste them into our converter and get browser-ready JavaScript or TypeScript instantly.

Migrating from curl to JavaScript

Translate shell scripts and terminal cURL commands to browser-compatible fetch or Axios code. Our converter handles method, headers, body, and authentication flags automatically.

Learning JavaScript HTTP Requests

Understand how cURL flags map to fetch options. See exactly how -X maps to method, -H to headers, -d to body, and -u to Authorization headers — a practical way to learn the fetch API.

Debugging API Calls

Convert cURL commands copied from browser DevTools Network tab to fetch code. Reproduce API calls in JavaScript without manually translating each header and body parameter.

Code Review and Documentation

Generate clean fetch or Axios examples from cURL test commands for code reviews, README files, and API documentation. Choose between promise chains or async/await style to match your codebase.

TypeScript API Client Development

Convert cURL commands to typed fetch or Axios TypeScript code with proper type annotations. Get Response and AxiosResponse types added automatically when you select TypeScript output.

Understanding cURL to fetch Conversion

How cURL commands map to browser fetch and Axios JavaScript code

What is a cURL to fetch Converter?

cURL is a command-line tool for making HTTP requests from the terminal. It is widely used by developers to test APIs, download files, and interact with web services using flags like -X (method), -H (headers), -d (body), and -u (authentication). The fetch API is the browser-native standard for making HTTP requests in JavaScript — it uses a Request object with equivalent options. Our cURL to fetch converter bridges the gap: paste any cURL command and instantly get the equivalent browser fetch or Axios JavaScript/TypeScript code. This is especially useful when working with API documentation that provides cURL examples, or when translating terminal commands into web application code.

How Our cURL to fetch Converter Works

1. Paste Your cURL Command: Copy any cURL command — from API docs, browser DevTools, or your terminal — and paste it into the input. Multi-line cURL commands with backslash continuation (\) are supported automatically.
2. Click Convert: Choose your output style (fetch or Axios, promise or async/await) and language (JavaScript or TypeScript), then click Convert to fetch. The converter parses all cURL flags and generates clean, ready-to-use code.
3. Copy or Download: Copy the generated code to clipboard or download it as fetch-request.js or fetch-request.ts for immediate use in your project.

What Gets Converted

HTTP Method & URL: The -X METHOD or --request METHOD flag maps to the method option in fetch. The URL is extracted automatically. GET requests with no body omit the method field.
Request Headers: Each -H 'Key: Value' or --header 'Key: Value' flag maps to an entry in the headers object. Multiple headers are supported.
Request Body: The -d, --data, and --data-raw flags map to the body field in fetch or data in Axios. JSON bodies are automatically pretty-printed for readability.
Authentication: The -u user:pass or --user user:pass flag is converted to an Authorization: Basic <base64> header automatically using btoa().

Supported cURL Flags

-X, --request METHOD — Sets the HTTP method (GET, POST, PUT, DELETE, PATCH, etc.)
-H, --header "Key: Value" — Adds a request header
-d, --data, --data-raw "body" — Sets the request body
--data-urlencode "key=value" — Adds URL-encoded body data and sets Content-Type automatically
-u, --user "user:pass" — Adds a Basic Auth Authorization header using btoa()
--compressed — Adds Accept-Encoding: gzip header
-L, --location — Adds a comment noting fetch follows redirects by default
-k, --insecure — Adds a comment noting fetch cannot disable SSL verification in browsers

Flags not listed above (such as --cert, --proxy, --max-time, --cookie) are silently ignored since they have no direct equivalent in the browser fetch API.

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Frequently Asked Questions About cURL to fetch Converter

Common questions about converting cURL commands to JavaScript fetch code

A cURL to fetch converter translates cURL command-line HTTP requests into equivalent browser fetch or Axios JavaScript/TypeScript code. cURL uses flags like -X, -H, and -d to define HTTP requests in the terminal. Our converter parses those flags and generates the equivalent fetch() or axios() call that you can use directly in a browser or Node.js application.

The converter supports the most common cURL flags: -X / --request (HTTP method), -H / --header (request headers), -d / --data / --data-raw (request body), --data-urlencode (URL-encoded body), -u / --user (Basic Auth), --compressed (Accept-Encoding: gzip), -L / --location (redirect note), and -k / --insecure (SSL note). Unsupported flags like --proxy, --cert, and --cookie are silently ignored.

Paste the multi-line cURL command as-is — the converter automatically handles backslash line continuation (\). Lines ending with \ are joined before parsing, so you can paste cURL commands directly from API documentation or your terminal without any manual editing.

Yes. The -u user:pass or --user user:pass flag is automatically converted to an Authorization: Basic <base64> header using btoa(user:pass). The base64 encoding is computed at conversion time and embedded directly in the generated code.

The --compressed flag adds an Accept-Encoding: gzip header to the generated code, which is the equivalent browser behavior. The -k / --insecure flag adds a comment noting that fetch does not support disabling SSL certificate verification in browsers — this is a browser security restriction with no fetch equivalent.

Yes. Select "TypeScript" from the Language dropdown before clicking Convert. The TypeScript output adds type annotations: Response for fetch responses, AxiosResponse for Axios responses, and a Promise<void> return type on the async function. An import statement for Axios is also added automatically when using Axios output style.

Yes. Choose "Axios — .then/.catch" or "Axios — async/await" from the Output Style dropdown. The converter generates an axios({ method, url, headers, data }) call with the same options. For TypeScript, an import statement for axios and AxiosResponse is added at the top of the output.

Absolutely. All cURL to fetch conversion happens entirely in your browser using JavaScript. Your cURL commands, API tokens, passwords, and request bodies are never sent to any server. Everything runs locally on your device, ensuring complete privacy.

Yes! Our cURL to fetch converter is 100% free with no signup, no ads, and no usage limits. Convert cURL commands to fetch or Axios code as many times as you need — completely free, forever.