expressjsHow can I use Express.js with TypeScript?

Express.js is a web application framework for Node.js that provides a robust set of features for web and mobile applications. TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. Using Express.js with TypeScript is possible by using the ts-node package.

To use Express.js with TypeScript, we need to install the ts-node package:

npm install ts-node

Then we can create a server.ts file with the following code:

import express from "express";

const app = express();

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

app.listen(3000, () => {
  console.log("Server running on port 3000");
});

Once the server is running, we can access the application by going to http://localhost:3000 in the browser.

The code above consists of the following parts:

1. import express from "express" - This imports the Express.js module.
2. const app = express() - This creates an Express.js application.
3. app.get("/", (req, res) => { ... }) - This defines a route handler for the root path (/).
4. app.listen(3000, () => { ... }) - This starts the Express.js server on port 3000.

By using TypeScript with Express.js, we can take advantage of the type-safety and other features of TypeScript.

Helpful links

• Express.js
• TypeScript
• ts-node

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