JSON Formatter — Beautify, Minify & Validate
Format, beautify, minify, and validate JSON online for free. Syntax highlighting, tree view, error detection, and more. No signup required.
How it works
Enter your data
Fill in the form fields or paste your content to get started.
Processed in your browser
Everything runs client-side — your data never leaves your machine.
Copy or download results
Get instant results you can copy to clipboard or download.
Features
Beautify & Minify
Format JSON with custom indentation or minify to reduce size.
Syntax Highlighting
Color-coded syntax for strings, numbers, booleans, and null values.
Error Detection
Precise error messages with line and column numbers for invalid JSON.
Stats & Metrics
Character count, line count, key count, and nesting depth.
Client-Side Only
All processing happens in your browser. Your data never leaves your machine.
Sample Data
Load sample JSON to quickly test and explore the tool's features.
Frequently asked questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used to store and exchange data. It's the most common format for APIs, configuration files, and data storage.
What does JSON beautify/prettify do?
Beautifying JSON adds proper indentation and line breaks to make it human-readable. This makes it easier to understand the structure and debug issues.
What does JSON minify do?
Minifying JSON removes all unnecessary whitespace and line breaks to reduce file size. This is useful for production environments where bandwidth matters.
How do I validate JSON?
Paste your JSON into the input area and click 'Validate'. The tool will check if it's valid JSON and show specific error messages with line and column numbers if issues are found.
Is my data safe?
Yes, all processing happens in your browser. Your JSON data is never sent to any server.
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Use cases
API Development
Format and validate API responses while developing and testing RESTful services.
Configuration Files
Clean up and validate JSON configuration files for applications and services.
Data Analysis
Make large JSON datasets readable and explore nested data structures.
Debugging
Quickly find and fix JSON syntax errors with precise error location reporting.