Is it possible to run a node JS program in a console-like environment?

Question

What I want is very simple, to run code while typing, just like enter node and run things like this:

% node
Welcome to Node.js v17.0.1.
Type ".help" for more information.
> var a=5; var b=6;
> console.log(a+b);
11

But in this case, I have to copy and paste my code again and again.

Is it possible to "include" the code from an eternal .js file, then let me stay in the console-like environment to run the code?

Store these in the app.js:

var a=5;
var b=6;
function addNumber(x,y){console.log(x+y);}

In node console:

% node
Welcome to Node.js v17.0.1.
Type ".help" for more information.
> include "app.js" //- This is what I'm looking for
> addNumber(a,b);
11

CertainPerformance · Accepted Answer · 2022-08-28 05:13:04Z

3

You can require files in the REPL just as easily as you can in a standard Node script.

For example, inside a directory, create a file, foo.js:

module.exports = () => 'foo';

And inside that directory, enter Node:

PS D:\Directory> node
Welcome to Node.js v14.17.6.
Type ".help" for more information.
> const foo = require('./foo');
undefined
> console.log(foo())
foo
undefined
>

require('./foo') will return the exports of the foo file in the same directory.

require('../foo') will return the exports of the foo file in the parent directory.

Absolute paths work too. And so on.

answered Aug 28, 2022 at 5:13

CertainPerformance

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