/express-cors-proxy-server

Primary LanguageJavaScript

Express CORS proxy server

Introduction

This tiny Express app is a proxy server which can be used to call public APIs with a restrictive CORS policy.

When you try to call a public API from your browser, you may find your request blocked because of CORS. The solution is to call this Express app instead, and let this app call the public API for you. The request then becomes a server-to-server request, which CORS doesn't block.

How to run the app

Install npm packages:

npm install

Start the app:

npm start

How to make API calls

Call this Express app from your own app. Here's an example:

fetch(
  // this is where you call the Express app
  'http://localhost:3001/',
)
  .then(function (response) {
    if (response.ok) {
      return response.json();
    } else {
      return Promise.reject(response);
    }
  })
  .then(function (data) {
    console.log(data);
  })
  .catch(function (error) {
    console.warn('Something went wrong.', error);
  });

Then change the url in index.js (of this app) to the url of the API endpoint you want to call.

Sources / Further information