bypass cors in javascript

To bypass CORS in JavaScript, you can use the Fetch API to make cross-origin requests. The Fetch API provides an easy-to-use interface for making requests and handling responses. However, by default, it enforces the same-origin policy, which prevents requests to resources from a different origin.

To bypass the CORS policy, you can use a proxy server or configure the server to allow cross-origin requests. However, if you don't have control over the server, you can use a proxy service like CORS-anywhere or a browser extension such as Allow CORS.

Here's an example of using the Fetch API to make a cross-origin request:

index.tsx
fetch('http://example.com/api/data')
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error));
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If the server doesn't allow cross-origin requests, you'll get an error like:

index.tsx
Access to fetch at 'http://example.com/api/data' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
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In this case, you can use a proxy to bypass the CORS policy, like this:

index.tsx
fetch('https://cors-anywhere.herokuapp.com/http://example.com/api/data')
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error));
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Alternatively, if you have control over the server, you can allow cross-origin requests by configuring the server to include the Access-Control-Allow-Origin header.