Building a RESTful API with Express.js

To build a RESTful API with Express.js, follow these steps:

1. Install Express.js by running the following command:

1npm install express

2. Create an Express.js application and define a route for the API endpoint. For example:

1const express = require("express");
2const app = express();
3
4app.get("/api", (req, res) => {
5  res.json({ message: "Hello, world!" });
6});

3. Start the Express.js server and listen on a specific port. For example:

1const PORT = 3000;
2
3app.listen(PORT, () => {
4  console.log(`Server is running on port ${PORT}`);
5});

Once your Express.js API is up and running, you can test it by making HTTP requests to the defined endpoints.

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// Setting up Express.js

​

const express = require("express");

const app = express();

​

const PORT = 3000;

​

app.get("/api", (req, res) => {

  res.json({ message: "Hello, world!" });

});

​

app.listen(PORT, () => {

  console.log(`Server is running on port ${PORT}`);

});