Objects — Free JavaScript Tutorial

Learn Objects in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Objects in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Sep 17, 2026

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Objects in JavaScript

Objects store key-value pairs. Keys are strings (or Symbols), values can be any type including functions (then called methods).

Access: `obj.key` (dot notation) or `obj["key"]` (bracket notation — useful with dynamic keys).

Adding/updating: `obj.newKey = value`. Deleting: `delete obj.key`.

`Object.keys(obj)` — array of keys. `Object.values(obj)` — array of values. `Object.entries(obj)` — array of [key,value] pairs.

Spread to copy/merge: `const copy = {...original}`. `const merged = {...obj1, ...obj2}`.

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