cURL to JavaScript (fetch) Converter

cURL to JavaScript (fetch) Converter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Development
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

1Paste your raw cURL command into the input text area.
2Toggle options to pretty-print the request body or include explanatory comments in the output.
3Copy 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.

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.

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.

Pretty-print body: disabled, Include comments: disabled

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Convert POST Request with JSON Payload

2. Convert GET Request with Authorization Headers

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