How to avoid third-party interfaces returning 403 errors in Node environment?

Node.js environment handles third-party APIs and returns 403 error

When calling third-party website APIs using Node.js, you often encounter 403 errors. For example, the API address https://core-api.prod.blur.io/v1/prices is normally accessible in the browser, but it returns 403 in the Node.js environment.

The following Node.js code demonstrates this problem:

 let response = await fetch('https://core-api.prod.blur.io/v1/prices');
const data = await response.text();
console.log(data); // 403

Since we cannot directly modify the configuration of third-party websites, we need to find a solution on the Node.js side.

There are two main solutions:

Method 1: Simulate the browser request header

Browser requests usually contain specific request headers. By adding these headers, browser requests can be simulated, thus avoiding 403 errors. For example:

 let response = await fetch('https://core-api.prod.blur.io/v1/prices', {
  headers: {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
    'accept': 'application/json',
    'content-type': 'application/json',
    'authorization': 'Bearer your_access_token' //If authorization is required}
});

Please adjust the above code according to the actual request header of the browser. your_access_token needs to be replaced with the actual access token.

Method 2: Use JSONP request

JSONP (JSON with Padding) can bypass CORS limits and sometimes resolve 403 errors. Using the jsonp library:

 const jsonp = require('jsonp');

jsonp('https://core-api.prod.blur.io/v1/prices', null, (err, data) => {
  if (err) {
    console.error(err.message);
  } else {
    console.log(data);
  }
});

Both methods can try to solve the 403 error problem of calling third-party APIs under Node.js environment. Which method to choose depends on the specific API and server configuration. If method one is invalid, try method two. Remember, authorization header information needs to be added only if the API requires authorization.

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