How to restart a server automatically in Deno

In this tutorial, we are going to learn about how to restart a deno server automatically when your code changes in the app files.

Installing the Denon package

Deno provides us a third party module called denon, that watches for the file changes and restart the server automatically.

Install the denon package by running the following command in your terminal.

deno install --allow-read --allow-run --allow-write --allow-net -f --unstable https://deno.land/x/denon/denon.ts

Note: To install the above package, you should require deno ^1.0.1 version.

Restarting the server

Once you are successfully installed the denon package, now you can start a server in a watch mode using the denon run command followed by the file path.

denon run --allow-net app.ts

Output:

➜  deno-app denon run --allow-net app.ts
[denon] v2.1.0
[denon] watching path(s): *.*
[denon] watching extensions: ts,tsx,js,jsx,json
[denon] starting `deno run --allow-net app.ts`

http://localhost:3000/

Now, if you make any code changes denon will automatically restart your app with the updated changes.