expressjsHow can I use Express.js to return a JSON response?

Express.js is a web application framework for Node.js that provides a simple way to return a JSON response. To use Express.js to return a JSON response, you need to set up your server, create a route to handle the request, and send the response in JSON format.

For example:

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

app.get('/', (req, res) => {
  res.send({
    message: 'Hello World!'
  });
});

app.listen(3000);

The above code will create a server and listen on port 3000. When a request is sent to the / path, the server will respond with a JSON object containing a message.

The code consists of the following parts:

1. const express = require('express'); - This imports the Express.js library.
2. const app = express(); - This creates an Express.js application.
3. app.get('/', (req, res) => { ... }); - This creates a route that will handle requests sent to the / path.
4. res.send({ ... }); - This sends a JSON response containing the message Hello World!.

For more information, see the Express.js documentation.

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