How to use the Fetch API Code Generator
- 1. Enter the requestURL, method, token, headers and JSON body.
- 2. Pick a styleasync/await, .then() chains or axios.
- 3. Copy the codePaste it into your app and replace the placeholders.
What the generated code handles
- JSON bodies: the body is checked as valid JSON, sent with
JSON.stringify, andContent-Type: application/jsonis added for you. - HTTP errors: fetch does not reject on 404 or 500, only on network failure, so the code checks
response.okand throws. axios throws for those statuses by itself. - Timeouts: fetch has no timeout by default and can hang.
AbortSignal.timeout(ms)cancels it and raises a TimeoutError, which the catch block reports clearly. - Auth: a bearer token becomes an
Authorization: Bearer …header.
Worked example
A POST to https://api.example.com/v1/students with a token, an Accept header, a two-field JSON body and a 10-second timeout gives code with 3 headers (Content-Type, Authorization and Accept), body: JSON.stringify({ "name": "Asha", "course": "Python" }) and signal: AbortSignal.timeout(10000). It sits inside an async function with try/catch, so one failed request can't crash the rest of your code.
Things to remember:
- Never put real secret keys in front-end code; anyone can read them in DevTools. Call such APIs from your server instead.
- Browsers block calls to another domain unless that server allows it with CORS headers.
- GET and DELETE requests have no body here, which is the usual practice.
Switch the style to compare the same request written three ways.
Frequently asked questions
fetch or axios: which should I use?
fetch is built in, so there is nothing to install. axios adds conveniences like automatic JSON, throwing on HTTP errors, interceptors and upload progress.
Does this work in Node.js?
Yes. fetch and AbortSignal.timeout are built into Node 18 and later.
Why .then() as an option?
Older codebases use promise chains. Both styles do the same thing.
Is the fetch api code generator free?
Yes, it is free. Generating your first snippet asks for your name and WhatsApp number once. After that, the fetch api code generator and every other Uncodemy tool open with no form.