express-cors-anywhere

An express middleware for redirecting requests and avoiding CORS errors when hitting cross-origin APIs.

🚀 Getting Started

Using yarn:

yarn add express-cors-anywhere

✍️ Usage

Just embed the default export at the route you wish to redirect requests from:

import express from "express";
import axios from "axios";
import { json } from "body-parser";
import anywhere from "express-cors-anywhere";

const { PORT } = process.env;
const port = PORT || 3000;

(async () => {
  /* configure cors */
  await new Promise(
    resolve => express()
      .use(json())
      .use("/cors-anywhere", anywhere())
      .get("/hello", (_, res) => res.status(200).send("Hi!"))
      .listen(port, resolve),
  );
})();

Subsequently, all requests made to http://localhost:3000/cors-anywhere will be redirected from your server without cors headers using an identical format to CORS Anywhere. All you need to do is prefix the location of your middleware route to the required target URL.

As an example, say you wish to POST to a cross-origin API at https://some-example-api.com/some-example-endpoint from your browser. This would not work from your browser because a) it does not exist, and b) it relies on a resource provided by another origin. However, we can just make the same request to the middleware address instead:

import axios from "axios";

(async () => {
  const { data, status } = await axios({
    url: "http://localhost:3000/cors-anywhere/https://some-example-api/some-example-endpoint",
    method: "post",
    headers: {
      "Content-Type": "application/json",
    },
    data: {
      some: "data",
    },
  });
  /* data returned is from https://some-example-api/some-example-endpoint */
  console.log({ data });
});

✌️ License

MIT