title: How to use data returned from an HTTP request using http-proxy-middleware and Express
body: <p>I am making API calls to Squarespace for an inventory management system. I've set up a Node.js and Express server, and have been using http-proxy-middleware to set up a proxy and make GET requests.</p>
  <p>I am able to generate the GET requests successfully on my localhost - an HTML pre-tag is filled with all of the JSON data of the request. However, I am completely clueless on how to handle and use the data further that was returned to me. When I make a call and receive Pending orders, I want to pull JSON data from the returned request body of the orders, such as SKU numbers for products purchased.</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>    const { response } = require('express');
      const express = require('express'); 
      require("dotenv").config();
      const { createProxyMiddleware, responseInterceptor } = require('http-proxy-middleware');
      const router = express.Router();
  
      const PORT = 3000; 
      const HOST = "localhost";
      const GET_ORDERS_URL = process.env.SS_GET_ORDERS_URL;
      const API_KEY = process.env.SS_AUTH;
  
      const app = express(); 
  
      const proxy = app.use("/testing", createProxyMiddleware({
          target: GET_ORDERS_URL,
          headers: {
              'Authorization': API_KEY,
              'User-Agent': 'halp me'
          },
          changeOrigin: true,
          pathRewrite: {
              [`^/testing`]: '',
          },
          selfHandleResponse: true, // 
          onProxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) =&gt; {
            
              var orderResponse = responseBuffer.toString('utf-8');
              return orderResponse;
          }),
        }));
  
  
      // Start Proxy
      app.listen(PORT, HOST, () =&gt; {
          console.log(`Starting Proxy at ${HOST}:${PORT}`);
      });</code></pre>
  </div>
  </div>
  </p>
  <p>The API request returns JSON data, which I would love to use and process for the next part of my inventory management. I'm trying to figure out why I can't get return orderResponse; to output anything at all.</p>
  <p>I have tried every variation of returning a variable I can imagine, console.logged a million things - any guidance to what I'm missing here would be greatly appreciated!</p>