How to read key values from a property file in javascript

Question

I want to read properties from a config file - in a key value pair format from my main.js

I have a config file config.json

{
 "IGUrl": "xyz",
 "Key": "abc",
 "dbName": "node-login"
}

I want to read the property say "IGUrl" from my app.js.

The code to access and read this file is

    var config  = require('./config.json');
    var x = config.IGUrl;
    console.log("TEST URL " + x)

But this is giving me an error Uncaught TypeError: Cannot read property 'IGUrl' of undefined

var { config } = require('./config.json') you are not importing correctly. If you would import correctly it will work. In config file you need module.exports = objectThatYouAreExporting — Nicolae Maties
– Nicolae Maties, Commented Oct 30, 2019 at 16:24
Hmm, I thought it was the JSON.parse() as well, but just tested this on my node and apparently requiring a json file automatically parses it. So your posted code works for me. Which version of node.js are you running since iirc, requiring a json file is a relatively recent addition. — Shilly
– Shilly, Commented Oct 30, 2019 at 16:30
The user is importing a JSON file, no a JS module in some kind of module format. So exporting should not matter. And it seems requiring a json file has been in node since 0.5. I just copy pasted the OP code and everything works for me as expected on node v12.2.0 . Are you running this on the client? Or with a non-node version of require() ? — Shilly
– Shilly, Commented Oct 30, 2019 at 16:34
What version of Nodejs are you using @psd and is config.json in same directory as main.js — Vishnudev Krishnadas
– Vishnudev Krishnadas, Commented Oct 30, 2019 at 17:03

Alain Cruz · Accepted Answer · 2019-10-31 00:25:20Z

1

You can just use a common JS file instead. Is much easier and there is no need to do anything special other than accessing the file.

export const properties = {
    IGUrl: "xyz",
    Key: "abc",
    dbName: "node-login"
};

export default properties;

Then whenever you need to access it, just use the following code.

import properties from './path/properties';

console.log(properties.IGUrl);

edited Oct 31, 2019 at 0:25

answered Oct 30, 2019 at 16:28

Alain Cruz

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salt-pepper · Accepted Answer · 2019-11-01 20:41:16Z

0

Since this code is on client side, the require statement wouldn't work. I just had to have the config file in my html file and reference it directly in my main.js

config.js

const properties = {
    url: "xyz",
    key: "abc",
    dbName: "node-login"
    };

main.js

console.log("TEST " + properties.url);

index.html

<script src="/config.js"></script>

answered Nov 1, 2019 at 20:41

salt-pepper

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