cURL to JavaScript (fetch) Converter

Convert a cURL command into a JavaScript fetch() code snippet with headers, body, and method

Key Facts

Category
Developer & Web
Input Types
textarea, checkbox
Output Type
text
Sample Coverage
4
API Ready
Yes

Overview

Quickly convert your cURL commands into clean, ready-to-use JavaScript fetch() code snippets. This tool automatically parses HTTP methods, headers, and request bodies from your cURL syntax, generating standard JavaScript code for browser or Node.js environments.

When to Use

  • •When migrating API requests tested in the terminal via cURL into a frontend web application using the native Fetch API.
  • •When debugging API integrations and needing to quickly translate third-party documentation cURL examples into JavaScript.
  • •When building Node.js scripts or browser scripts that require structured HTTP requests with custom headers and JSON payloads.

How It Works

  • •Paste your raw cURL command into the input text area.
  • •Toggle options to pretty-print the request body or include explanatory comments in the output.
  • •Copy the instantly generated JavaScript fetch() code snippet from the output field.

Use Cases

Translating API documentation examples written in cURL into frontend JavaScript code.
Converting terminal-based API tests into reusable JavaScript functions for web applications.
Generating fetch requests with complex headers and authentication tokens for rapid prototyping.

Examples

1. Convert POST Request with JSON Payload

Frontend Developer
Background
A developer is integrating a new user registration API. The API documentation only provides a cURL command for testing.
Problem
Manually writing the fetch request with headers and a stringified JSON body is tedious and error-prone.
How to Use
Paste the cURL command containing the POST method, Content-Type header, and JSON data into the input field, then copy the generated fetch code.
Example Config
Pretty-print body: enabled, Include comments: enabled
Outcome
A clean JavaScript fetch snippet with headers and a formatted JSON body ready to paste into the application.

2. Convert GET Request with Authorization Headers

Full-stack Engineer
Background
An engineer needs to fetch secure user data from a backend service using a Bearer token.
Problem
The engineer has a working cURL command with authorization headers but needs to run it inside a React component.
How to Use
Input the cURL command containing the authorization header into the converter.
Example Config
Pretty-print body: disabled, Include comments: disabled
Outcome
A minimal, comment-free JavaScript fetch snippet containing the Authorization header.

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FAQ

Does this tool support POST requests with JSON payloads?

Yes, it parses the data flags and converts them into the body of the fetch request.

Can I format the output JSON body?

Yes, enabling the 'Pretty-print body' option formats the JSON payload for better readability.

Does it support custom headers?

Yes, all headers specified with the -H or --header flags are extracted and added to the fetch headers object.

Can I use the generated code in Node.js?

Yes, the generated fetch() code works in modern Node.js environments as well as standard web browsers.

Are comments included in the generated code?

Yes, you can toggle the 'Include comments' option to add helpful annotations to the generated snippet.

API Documentation

Request Endpoint

POST /en/api/tools/curl-to-js-fetch

Request Parameters

Parameter Name Type Required Description
curlCommand textarea Yes -
prettyBody checkbox No -
includeComments checkbox No -

Response Format

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}
Text: Text

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-curl-to-js-fetch": {
      "name": "curl-to-js-fetch",
      "description": "Convert a cURL command into a JavaScript fetch() code snippet with headers, body, and method",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=curl-to-js-fetch",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]