JSON TOOL · CLIENT-SIDE
JSON Formatter
Paste compact or messy JSON and get clean, readable output with consistent indentation. Adjust indent size, copy results, and validate syntax — all in your browser.
Input
Output
How JSON formatting works
JSON data is often transmitted in a compact, minified form to save bandwidth. This tool parses the JSON structure and re-emits it with consistent indentation, line breaks, and spacing — making nested objects and arrays immediately scannable.
Debug APIs
Paste API responses to quickly inspect nested data structures.
Config files
Format package.json, tsconfig, or any JSON config for readability.
Validate syntax
Instantly spot missing commas, brackets, or quoting errors.
Frequently Asked Questions
What is JSON formatting?
JSON formatting (or pretty-printing) adds indentation and line breaks to compact JSON data, making it human-readable. This tool transforms minified JSON into a neatly structured format with consistent spacing.
Why should I format JSON?
Formatted JSON is essential for debugging APIs, reviewing configuration files, and sharing data with teammates. It makes nested structures, arrays, and object hierarchies immediately understandable.
What is pretty-printing?
Pretty-printing is the process of taking minified or compressed data and adding whitespace, indentation, and line breaks so it becomes easy to read. The data itself remains unchanged.