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JavaScript

JavaScript Comments

JavaScript comments leave hidden notes inside the code.

Read Time

5 min read

Difficulty

Beginner

Last Updated

Jun 15, 2026

Version

v1.0.0

Introduction

JavaScript comments explain code logic to other developers. The browser completely ignores these comments when executing the program. Developers use them to organize complex files or temporarily disable code while testing.

Syntax

1/* comment syntax */
2// Single line comment
3/* Multi-line 
4comment */

Key Points

Two slashes `//` create a single-line comment.
A slash-asterisk `/*` starts a multi-line comment.
An asterisk-slash `*/` ends a multi-line comment.
Comments prevent code execution.

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