cURL to JavaScript Converter

How to Convert cURL Commands to JavaScript Fetch

1. Paste Your cURL Command: Copy a cURL request snippet from an API documentation page, Postman, or browser network inspector into the left pane.
2. Click "Convert to Fetch": The shell tokenizer analyzes arguments, quotes, headers, HTTP methods, and JSON payloads.
3. Review JavaScript Code: Inspect the cleanly formatted fetch() request configured with headers, method, and stringified JSON body.
4. Copy or Download: Click "Copy Code" to grab the snippet for your codebase or click "Download" to save request.js.
5. Clear Workspace: Click "Clear" at any time to return the workspace to a neutral state.

What Is a cURL to JavaScript Converter?

A cURL to JavaScript Converter is an API developer productivity tool that translates command-line cURL syntax into native JavaScript fetch() request code. Most public API documentation (from Stripe, Twilio, GitHub, and OpenAI) provides examples exclusively as terminal cURL commands.

Converting complex cURL arguments—such as nested headers, multiline continuation backslashes (\), and JSON payload escaping—by hand is error-prone. CodeCrate automates this conversion instantly inside your browser without sending your credentials across the internet.

Before & After Example

curl -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer secret_token" \
  -d '{"username":"dev_user","active":true}' \
  https://api.example.com/v1/auth

// Native Fetch API Request
const response = await fetch("https://api.example.com/v1/auth", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Authorization": "Bearer secret_token"
  },
  body: JSON.stringify({
    "username": "dev_user",
    "active": true
  })
});
const data = await response.json();
console.log(data);

Key Features of CodeCrate cURL to JavaScript Converter

• Quote-Aware Lexical Tokenizer: Parses escaped single quotes, double quotes, and multiline backslashes accurately.
• Automatic JSON Body Detection: Automatically parses and formats JSON strings with JSON.stringify() for maximum readability.
• Comprehensive HTTP Method Support: Handles GET, POST, PUT, PATCH, DELETE, and custom HTTP request methods.
• Zero Network Transmission: The tool never dispatches HTTP requests or uploads your API tokens to third-party endpoints.
• One-Click File Export: Download your generated request immediately as request.js for instant script execution.

Common Developer Use Cases

Technical Notes & Security Architecture

Strict Static Translation: CodeCrate treats all pasted commands as inert strings. The browser does NOT invoke fetch() or XMLHttpRequest against the parsed URL, ensuring that rate limits, webhook endpoints, and authorization scopes are never triggered during code generation.

Bearer Token Privacy: API keys, bearer tokens, and session cookies are processed strictly inside volatile browser memory. We maintain zero telemetry, zero analytics tracking, and zero remote logging.

Frequently Asked Questions

Related Developer Tools