Import modules from npm

Use JavaScript modules from npm in your Deno programs with the "npm:" specifier in your imports.

Import the express module from npm using an npm: prefix, and appending a version number. Dependencies from npm can be configured in an import map also.

import express from "npm:express@4.18.2";

Create an express server

const app = express();

Configure a route that will process HTTP GET requests

app.get("/", (_req, res) => {
  res.send("Welcome to the Dinosaur API!");
});

Start an HTTP server using the configured Express app

app.listen(3000);

Run this example locally using the Deno CLI:

deno run --allow-net --allow-read --allow-env https://examples.deno.land/npm.ts

Additional resources:

Node.js / npm support in Deno
npm: specifiers
express module on npm

Use Node.js built-in modules Built-in TypeScript support