# How to recognize when to use : or = in JavaScript?

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

The colon (:) can be used when you want to define the property to an object while equal (=) can be used when you want to assign a value to a variable.

## Example

Following is the code −

var studentDetails = {
"studentId": 101,
"studentName": "John",
"studentSubjectName": "Javascript",
"studentCountryName": "US"
}
console.log(studentDetails);
var firstName = "David";
console.log(firstName);

To run the above program, you need to use the below command −

node fileName.js.

Here, my file name is demo325.js.

## Output

This will produce the following output −

PS C:\Users\Amit\javascript-code> node demo325.js
{
studentId: 101,
studentName: 'John',
studentSubjectName: 'Javascript',
studentCountryName: 'US'
}
David
Published on 27-Oct-2020 10:03:00