JSON Formatter
Format, minify, and validate JSON with error messages.
Overview
Paste, validate, and beautify your JSON data with this online JSON formatter and validator. Whether you're debugging an API response or cleaning up a config file, this tool formats your JSON with proper indentation, syntax coloring, and clear error messages pointing to the exact line where problems occur.
Key Features
- Format & Beautify — Transform minified JSON into properly indented, human-readable output with one click.
- Validate JSON — Instantly check if your JSON is valid with error messages showing the exact line and character position.
- Minify — Compress formatted JSON back to a single line for production use.
- Syntax Coloring — Keys, strings, numbers, booleans, and null values are color-coded for easy scanning.
Tech Stack
Built with HTML, CSS, and JavaScript. Uses JSON.parse() for validation and JSON.stringify() with indentation for formatting. Custom regex-based syntax highlighting.
Problem it solves
Reading minified JSON is nearly impossible, and finding syntax errors by eye is slow. This tool formats, validates, and highlights JSON instantly.
How it was built
Built with HTML, CSS, and JavaScript. JSON.parse/stringify for validation and formatting, regex-based syntax highlighting.
Frequently Asked Questions
Is the JSON Formatter completely free to use?
Yes, the JSON Formatter is 100% free with no account required, no subscription, and no watermarks.
Does JSON Formatter store any of my data or inputs?
No. All generation and calculations run client-side directly in your browser. None of your data or inputs are sent to or stored on external servers.
Can I use outputs from JSON Formatter for commercial projects?
Yes, all results generated with this tool are free to use for both personal and commercial projects without attribution.