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");
    byeController.bye(); 
}

//bye.controller.js
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:

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

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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