JSON5 Formatter & Studio
Comments & Trailing CommasFormat, beautify, and validate modern JSON5 documents with comments, unquoted keys, single quotes, and hex numbers.
JSON5 Formatter & Studio Online
Format, beautify, validate, and inspect JSON5 documents with PlayWithJSON's free online JSON5 formatter. JSON5 is an official extension to JSON that expands its syntax to include the production of ECMAScript 5.1.
Our JSON5 editor allows inline (//) and block (/* */) comments, unquoted object keys, single-quoted strings, trailing commas, hexadecimal numbers, and IEEE 754 floats. All operations run 100% locally in your browser for total privacy.
Why Use PlayWithJSON?
- Supports // and /* */ comments
- Permits unquoted keys & single quotes
- Allows trailing commas in arrays & objects
- 100% Free and works completely offline
- No telemetry or server uploads
What Can You Do With Our JSON5 Formatter?
Full Comments Support
Preserve and inspect single-line (//) and multi-line (/* */) comments in configuration files.
Clean ES5 Formatting
Beautify JSON5 with unquoted identifier keys and customizable indentation.
Instant Syntax Validation
Check for JSON5 syntax discrepancies and get accurate line/column error feedback.
Interactive Tree Inspector
Navigate complex nested JSON5 object trees and collapse nodes seamlessly.
Multi-Pane Split Studio
Open up to 4 parallel JSON5 editor panes for side-by-side comparison.
Export & Copy
One-click copy to clipboard or download formatted .json5 config files.
How to Format JSON5 Online
Paste or type JSON5
Enter your JSON5 or standard JSON code into any editor panel.
Click Format
The formatter beautifies comments, quotes, and indentation automatically.
Inspect in Tree or Raw View
Toggle between raw text and visual tree inspection with one click.
Copy or Download
Copy the formatted JSON5 or export it directly to your project.
JSON5 Formatting Example
JSON5 Syntax Validation Example
Supported JSON5 Features
Frequently Asked Questions about JSON5
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