How to use "require" dynamically in javascript?

Question

I have a javascript function in "sample.js" file. It is like this:

var mapDict = { '100': 'test_100.js', '200': 'test_200_API.js', '300': 'test_300_API.js' }

function mapAPI()
{
    this.version = 0.1;
}

mapAPI.prototype.getFileName = function( id ) {
   return mapDict[id]
}

module.exports = mapAPI;

in another file named "institute.js" I want to require the above "test_xxx_API" files dynamically. I have the following code:

const mapAPI  = require('../../sample.js');
const map     = new mapAPI();
const mapFile = map.getFileName("100");
var insAPI    = require(mapFile);

When I run this code by "node institute.js" command, I get the following error:

Error: Cannot find module './test_100_API.js'.

But the "test_100_API.js" file exists and is located in the current folder besides "institute.js". When I changed var insAPI = require(mapFile); to var insAPI = require("./test_100_API.js"); and give it the exact path instead of dynamic path, it works fine. Can anyone help me?

Thanks in advance

where in the disk are these dynamic files found, you nee dto include the full path, for example `require(__dirname+mapFile);` if on same folder else find the path they are under NOT just the filename the WHOLE path. — Nikos M., Nov 14 '18 at 18:05
They are on the same folder. My problem is that when I use `var insAPI = require(mapFile)` and prints `mapFile` value it is exactly prints `./test_100_API.js' in the console. My code works correctly with `var insAPI = require("./test_100_API.js")` but gives me error with `var insAPI = require(mapFile);`. This is the strange part. — we.are, Nov 15 '18 at 13:15
Take a look at this thread [link](https://stackoverflow.com/questions/42797313/webpack-dynamic-module-loader-by-require) But in resume what you have to do is **require(\`./${path}/file.js\`);** — Victor Oliveira, Jul 04 '19 at 11:11

How to use "require" dynamically in javascript?

0 Answers0