What does the cURL to JavaScript Fetch and Python Requests do?
Paste a cURL command up to 64 KiB, choose JavaScript Fetch or Python Requests, and generate reviewable code. A browser Worker parses the command using locally hosted WASM files. It does not execute the command, access @file references, or contact the request destination.
When should you use this tool?
Use this tool to start a client implementation from a cURL example. Use URL Encoder to inspect query components and JSON Formatter to inspect request bodies. Test generated code only in the intended runtime after reviewing warnings.
How do you use it?
- Paste a cURL command or open a local .txt or .sh file.
- Select JavaScript Fetch or Python Requests and choose Run.
- Review warnings, credentials, headers, and body handling before copying or downloading the generated code.
Worked example
Convert a basic GET request to Fetch
Input
curl 'https://example.com/api' -H 'Accept: application/json'Output
fetch('https://example.com/api', {
headers: {
'Accept': 'application/json'
}
});The converter writes source text. No request to example.com is sent, and the generated code is not executed.
Common errors and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| A command cannot be parsed. | The input is not supported cURL shell syntax or has unbalanced quotes. | Paste a complete cURL command and check quotes; PowerShell and CMD syntax may need conversion to Bash-style syntax. |
| Generated Fetch code behaves differently from cURL. | Browser CORS, restricted headers, credentials, and unsupported cURL flags do not have identical semantics. | Review visible warnings and adjust the code for its actual runtime; formatting success is not an HTTP execution test. |
Supported behavior and limitations
This tool does not bypass CORS, execute commands, access referenced files, verify endpoints, or guarantee semantic equivalence. Shell substitutions may become placeholders or target-language expressions and require review. Tokens remain visible in the generated code; copying or downloading preserves them. Input is capped at 64 KiB.
Standards and implementation references
- curlconverter (opens in a new tab)Provides local command parsing, target-language generators, and warning metadata.
- curlconverter browser setup (opens in a new tab)Documents the two WASM files served locally by this site.
Frequently asked questions about cURL → Code
Is my input uploaded?
No. Processing happens in a browser Worker. Engine files load from this website; tool input, output, and filenames are not sent to a processing API.
Do I need an account or API key?
No account, API key, or backend processing service is needed.
How do I save a result?
Review the result, then use the Copy or Download control available for that output. Modifying input clears stale results.
What are the limits?
This tool does not bypass CORS, execute commands, access referenced files, verify endpoints, or guarantee semantic equivalence. Shell substitutions may become placeholders or target-language expressions and require review. Tokens remain visible in the generated code; copying or downloading preserves them. Input is capped at 64 KiB.
What changed?
Added local processing, explicit size limits, cancellation, worked examples, error explanations, and downloadable results.