Should I use Axios or Fetch?

Fetch is built into modern browsers, meaning no extra libraries are needed. Axios is a popular 3rd party library that automatically handles JSON parsing and throws errors on bad status codes. For most modern projects, native Fetch is preferred to reduce bundle size, but Axios is still heavily used in enterprise apps.

Why do I get a CORS error?

CORS (Cross-Origin Resource Sharing) is a security feature in browsers. If your frontend on `localhost:3000` tries to fetch data from `api.example.com`, the API server must explicitly send a header allowing `localhost:3000` to read it. If it doesn't, the browser blocks the request.

Can I cancel a fetch request?

Yes, you can use the `AbortController` API. You pass an `AbortSignal` to the fetch options, and calling `controller.abort()` will cancel the network request, throwing an `AbortError`.

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JS Fetch API | JavaScript Tutorial

Learn about JS Fetch API in this comprehensive JavaScript tutorial for web development. Learn to fetch remote data, handle asynchronous streams, and send payloads to servers using the latest Promise-based syntax.

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Network Protocol

The native system for making network requests in modern JS.

The Fetch API is the modern browser standard for making network requests and interacting with RESTful APIs.

1The Request Flow

When you call fetch, the browser starts a network operation in the background and returns a Promise. Importantly, this promise resolves as soon as the server responds with headers—even before the actual data (the body) has finished downloading. This is why we have two distinct asynchronous steps: waiting for the response, and then waiting for the body to be parsed (e.g., into JSON).

2POST & Headers

Sending data requires more configuration than receiving it. You must specify the method as 'POST' and, crucially, set the 'Content-Type' header to 'application/json'. This tells the server how to interpret the text you are sending in the body. Without these headers, many servers will simply ignore the data you send or return an error.