JSON Formatter
Format and validate JSON data with syntax highlighting
json-formatter.inputJson
🔒json-formatter.privacyNotice
How to Use JSON Formatter
Format and validate JSON in 4 simple steps
Paste Your JSON
Copy and paste your JSON data into the input area. You can paste minified, unformatted, or even invalid JSON to check for errors.
Choose Format Options
Select your preferred indentation (2 or 4 spaces, or tabs), and choose between formatting or minifying your JSON data.
See Instant Results
Watch as your JSON is automatically formatted with syntax highlighting, line numbers, and error indicators if there are any validation issues.
Copy or Export
Click the copy button to copy the formatted JSON to your clipboard, or download it as a .json file for use in your projects.
Why Use Our JSON Formatter?
Powerful features for working with JSON data
Instant Validation
Automatically detects JSON syntax errors and highlights the exact location of issues with helpful error messages.
Syntax Highlighting
Color-coded JSON structure makes it easy to read and understand complex nested data with clear visual indicators.
Error Detection
Identifies missing brackets, trailing commas, invalid characters, and other common JSON formatting mistakes instantly.
100% Client-Side
All JSON processing happens in your browser - your data never leaves your device, ensuring complete privacy and security.
Lightning Fast
Format or minify large JSON files instantly, even with deeply nested structures and thousands of lines of data.
Multiple Output Formats
Choose between beautified JSON with custom indentation or minified JSON to reduce file size for production use.
Common Use Cases
How developers use our JSON formatter
API Development
Format API responses and request payloads to understand data structures, debug endpoints, and document API behavior.
Configuration Files
Edit and validate JSON configuration files for applications, ensuring correct syntax before deployment.
Data Exchange
Convert between formatted and minified JSON for data transfer, storage optimization, and inter-system communication.
Debugging & Testing
Quickly identify JSON syntax errors in logs, API responses, or data exports to fix issues faster.
Documentation
Create readable, formatted JSON examples for technical documentation, tutorials, and code samples.
Data Processing
Clean up and validate JSON data before importing into databases or processing with scripts and applications.
Frequently Asked Questions
Yes! Our JSON formatter is 100% free to use with no limitations, no registration required, and no hidden costs. Format and validate as much JSON data as you need.
Absolutely! All JSON formatting and validation happens entirely in your browser using JavaScript. Your data never gets uploaded to any server, ensuring complete privacy and security.
Formatting (beautifying) adds indentation, line breaks, and spacing to make JSON human-readable. Minifying removes all unnecessary whitespace to reduce file size for storage or transmission.
Yes! Our validator uses the standard JSON.parse() method to detect all syntax errors including missing brackets, trailing commas, unquoted keys, and invalid characters. It shows the exact error location and type.
You can choose between 2 spaces, 4 spaces, or tab indentation for formatting your JSON. Each option follows standard coding conventions used in different programming environments.
Yes! Our formatter can handle JSON files with thousands of lines. However, extremely large files (10+ MB) may take a few seconds to process depending on your device's performance.
Standard JSON does not support comments. If you paste JSON with comments (JSONC or JSON5), the formatter will show syntax errors. You'll need to remove comments for valid JSON.
Yes! Since all processing happens in your browser, once the page loads you can use the formatter offline without an internet connection. Your data stays completely local.
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