cURL to Fetch
Convert cURL commands to JavaScript fetch
Paste one cURL command and convert it into runnable fetch code first; parsed previews and compare cases are available in Advanced mode.
The full guide also includes pitfalls, worked examples, snippets, FAQs, and related tools for checking results or troubleshooting.
About this tool
Translate a simple one-line cURL request into an editable JavaScript fetch draft. The parser recognizes a small set of method, header, and literal body flags; it does not reproduce shell execution, file loading, or all cURL semantics. Inspect the request preview and response-reading code before use. The command is not executed, but its full input draft is stored in this browser.
Failure Clinic (Common Pitfalls)
A cURL draft is assumed to reproduce shell and browser behavior
Cause: Data flags are read as literals, shell quoting and escapes are simplified, and unsupported options may be ignored or mistaken for a URL argument. Fetch also has its own CORS, header, body, and response-reading requirements.
Fix: Use simple single-line commands with placeholder credentials. Inspect URL, method, headers, body, and response handling before executing the code; the complete command draft is saved in this browser.
Production Snippets
Inspect literal data before running generated code
text
Input:
curl 'https://example.com' --data-urlencode 'q=hello world'
Generated request fields:
method: POST
body: q=hello world
This converter does not turn the space into %20 or +.
The template ends by calling response.json().Frequently Asked Questions
Which cURL syntax is recognized?
Use a simple one-line curl command with a URL, -X/--request, -H/--header, -I/--head, or data flags. Without an explicit method it chooses POST when a data argument exists, otherwise GET. This is a small tokenizer, not a shell or complete cURL parser.
Are all data flags equivalent to real cURL?
No. Data arguments are treated as literal strings and joined with &. --data-urlencode is not URL-encoded, @file is not read, and shell variables, command substitutions, escapes, multipart uploads, and unsupported flags are not faithfully translated. Compare the generated request preview with the intended request.
Will generated fetch code run unchanged?
Review it first. The template always reads response.json(), which must be changed for empty or non-JSON responses. Browser CORS, forbidden headers, cookies, and Fetch method/body restrictions still apply. The converter does not execute either the command or the generated request.
What happens to tokens in pasted commands?
Conversion does not upload the command, but the complete input is saved in this browser’s local storage and restored later. Replace real credentials with placeholders before pasting, especially on shared browser profiles. Clear removes the saved command.
Keep browsing