expressjsHow do I use Express.js to fetch data?

Express.js is a web application framework for Node.js that enables developers to easily create web applications. It provides a simple and powerful API for fetching data from a server.

To use Express.js to fetch data, we can use the fetch API. Here is an example code:

const express = require('express');
const app = express();

app.get('/data', (req, res) => {
  fetch('http://example.com/data.json')
    .then(response => response.json())
    .then(data => res.json(data));
});

app.listen(3000);

This code will fetch data from http://example.com/data.json and send it back as a response to the client.

The code consists of the following parts:

1. const express = require('express'); - This line imports the Express.js module.
2. const app = express(); - This line creates an Express.js application.
3. app.get('/data', (req, res) => { ... }); - This line defines a route for the application which will fetch data when the /data URL is requested.
4. fetch('http://example.com/data.json') - This line fetches the data from the specified URL.
5. .then(response => response.json()) - This line parses the response as JSON.
6. .then(data => res.json(data)) - This line sends the parsed data as a response to the client.
7. app.listen(3000); - This line starts the server on port 3000.

For more information, please refer to the Express.js documentation.

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