TypeError Cannot read property confvar of undefined

Question

Here is my first file:

var self = this;
var config = {
    'confvar': 'configval'
};

I want this configuration variable in another file, so I have done this in another file:

conf = require('./conf');
url = conf.config.confvar;

But it gives me an error.

TypeError: Cannot read property 'confvar' of undefined

What can I do?

Answer 1

Hello @kartik,

You need module.exports:

An object which is shared between all instances of the current module and made accessible through require(). exports is the same as the module.exports object. See src/node.js for more information. exports isn't actually a global but rather local to each module.

For example, if you would like to expose variableName with value "variableValue" on sourceFile.js then you can either set the entire exports as such:

module.exports = { variableName: "variableValue" };

Or you can set the individual value with:

module.exports.variableName = "variableValue";

To consume that value in another file, you need to require(...) it first (with relative pathing):

const sourceFile = require('./sourceFile');
console.log(sourceFile.variableName);

Hope it helps!!

Thank You!!