Objects often contain multiple properties, and many times you need to process each property one by one. This is where looping through objects becomes useful.
Unlike arrays, objects are not accessed by index numbers. Instead, you loop through their keys (property names) to read values.
Learning how to loop through objects helps you work with dynamic data such as user details, settings, and API responses.
Ways to Loop Through Objects in JavaScript
- Using for...in loop
- Using Object.keys()
- Using Object.values()
- Using Object.entries()
The for...in loop is the most common beginner-friendly method.
The for...in loop goes through each property name in the object.
Inside the loop, user[key] is used to access the value of that property.
Object.keys() returns an array of all property names in the object.
This is useful when you want to work with object data using array methods.
This example shows a modern way to loop through both keys and values at the same time.
By mastering object loops, students gain the ability to process structured data and build dynamic, real-world JavaScript applications.