JSON formatter & validator
Format, beautify, validate, and minify JSON online. Pinpoint syntax errors by line and column, sort keys, and copy or download the result.
JSON minifier
Minify JSON by removing whitespace and line breaks. Validates first and shows the size saved.
How to use JSON minifier
Minify JSON by removing all whitespace and line breaks, then copy or download the compact result. The JSON is validated first, and the size saving is shown in bytes and percent.
JSON minifier FAQs
Is JSON minifier free?
JSON minifier is a free online tool on ReallyUseful.Tools. No account is required.
Does JSON minifier run in my browser?
JSON minifier is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
More Developer Tools
Base64 encode / decode
Encode text to Base64 or decode Base64 back to text with full UTF-8 support and an optional URL-safe alphabet.
Unix timestamp converter
Convert Unix epoch timestamps to human-readable dates and back. Supports seconds and milliseconds, local time, UTC, and ISO 8601.
Hash generator
Generate MD5, SHA-1, SHA-256, SHA-512, SHA3, and CRC32 hashes for text or files. Verify checksums and create HMACs locally.
Regex tester
Test JavaScript regular expressions with live match highlighting, capture groups, flags, and replace preview.