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Simple HTTP Web Server


  • Use Deno's integrated HTTP server to run your own web server.


With just a few lines of code you can run your own HTTP web server with control over the response status, request headers and more.

Sample web server

In this example, the user-agent of the client is returned to the client:


// Start listening on port 8080 of localhost.
const server = Deno.listen({ port: 8080 });
console.log(`HTTP webserver running.  Access it at:  http://localhost:8080/`);

// Connections to the server will be yielded up as an async iterable.
for await (const conn of server) {
  // In order to not be blocking, we need to handle each connection individually
  // without awaiting the function

async function serveHttp(conn: Deno.Conn) {
  // This "upgrades" a network connection into an HTTP connection.
  const httpConn = Deno.serveHttp(conn);
  // Each request sent over the HTTP connection will be yielded as an async
  // iterator from the HTTP connection.
  for await (const requestEvent of httpConn) {
    // The native HTTP server uses the web standard `Request` and `Response`
    // objects.
    const body = `Your user-agent is:\n\n${
      requestEvent.request.headers.get("user-agent") ?? "Unknown"
    // The requestEvent's `.respondWith()` method is how we send the response
    // back to the client.
      new Response(body, {
        status: 200,

Then run this with:

deno run --allow-net webserver.ts

Then navigate to http://localhost:8080/ in a browser.

Using the std/http library

ℹ️ Since the stabilization of native HTTP bindings in ^1.13.x, std/http now supports a native HTTP server from ^0.107.0. The legacy server module was removed in 0.117.0.


import { serve } from "";

const port = 8080;

const handler = (request: Request): Response => {
  const body = `Your user-agent is:\n\n${
    request.headers.get("user-agent") ?? "Unknown"

  return new Response(body, { status: 200 });

console.log(`HTTP webserver running. Access it at: http://localhost:8080/`);
await serve(handler, { port });

Then run this with:

deno run --allow-net webserver.ts