deno run, run a file

deno run [OPTIONS] [SCRIPT_ARG] run a JavaScript or TypeScript file.

Usage Jump to heading#

To run the file at https://examples.deno.land/hello-world.ts use:

deno run https://examples.deno.land/hello-world.ts

You can also run files locally. Ensure that you are in the correct directory and use:

deno run hello-world.ts

By default, Deno runs programs in a sandbox without access to disk, network or ability to spawn subprocesses. This is because the Deno runtime is secure by default. You can grant or deny required permissions using the --allow-* and --deny-* flags.

Permissions examples Jump to heading#

Grant permission to read from disk and listen to network:

deno run --allow-read --allow-net server.ts

Grant permission to read allow-listed files from disk:

deno run --allow-read=/etc server.ts

Grant all permissions this is not recommended and should only be used for testing:

deno run -A server.ts

If your project requires multiple security flags you should consider using a deno task to execute them.

Watch Jump to heading#

To watch for file changes and restart process automatically use the --watch flag. Deno's built in application watcher will restart your application as soon as files are changed.

Be sure to put the flag before the file name eg:

deno run --allow-net --watch server.ts

Deno's watcher will notify you of changes in the console, and will warn in the console if there are errors while you work.

Running a package.json script Jump to heading#

package.json scripts can be executed with the deno task command.

Running code from stdin Jump to heading#

You can pipe code from stdin and run it immediately with:

curl https://examples.deno.land/hello-world.ts | deno run -

Terminate run Jump to heading#

To stop the run command use ctrl + c.