JSON Formatter & Beautifier
Format, validate, and minify JSON instantly. Runs entirely in your browser — your data never leaves your device.
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Instant formatting
Paste any JSON and format it instantly with proper indentation and syntax.
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Real-time validation
Detects syntax errors immediately and shows which line is broken.
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100% private
All processing happens in your browser. Your JSON data never touches any server.
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Minification
Remove all whitespace to reduce JSON size for production use.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It is human-readable text used to transmit data between servers and web applications. JSON uses key-value pairs and supports strings, numbers, booleans, arrays and nested objects.
Why is my JSON invalid?
Common causes: missing or extra commas, unquoted keys, single quotes instead of double quotes, trailing commas after the last item, or unescaped special characters in strings. The validator shows the exact line of the error.
What is JSON minification?
Minification removes all unnecessary whitespace, newlines and indentation from JSON. This reduces file size which improves API response times and reduces bandwidth usage in production environments.