Executing functions in node.js via CLI

Sometimes you just want to execute a particular function in an existing node.js backend, instead of making whole network requests to run that function you can run it using your CLI.

Let's say you have a file hello.controller.js

const byeController = require("./bye.controller");
exports.hello = () => {
    console.log("Hello There");
exports.bye = () => {
    console.log("See you again!");

you can run this function from your CLI by executing

node -e 'require("./controllers/hello.controller").hello()';

Output: Screenshot 2020-09-02 at 11.58.00 AM.png

PS: Functions involving DB operations cannot run using this. For that, you have to hit the endpoint.

This post is part of the series Bytes. Feel free to share some nifty tricks you use in your day-to-day in the comments. You can also @ me on twitter