The app.disabled() function is used to return the bool values of the setting name. It returns true if the setting name is disabled and returns false if the setting name is not disabled.
Syntax:
app.disabled(name)
Installation of the express module:
You can visit the link to Install the express module. You can install this package by using this command.
npm install express
After installing the express module, you can check your express version in the command prompt using the command.
npm version express
After that, you can just create a folder and add a file, for example, index.js. To run this file you need to run the following command.
node index.js
Project Structure:

Filename: index.js
javascript
const express = require( 'express' );
const app = express();
console.log(app.disabled( 'trust proxy' ))
app.enable( 'trust proxy' )
console.log(app.disabled( 'trust proxy' ))
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Steps to run the program:
Make sure you have installed the express module using the following command:
npm install express
Run the index.js file using the below command:
node index.js
Output:
true
false