JSON Formatter
Paste or drop your JSON, pick an indent width, then format or minify. Invalid documents fail with a helpful message and the error location highlighted — all computation happens locally.
How to use
Beautify, minify and validate JSON right in your browser. No uploads, nothing leaves your device. Your data is processed only inside this browser tab.
FAQ
Is my JSON uploaded anywhere?
No. Parsing and formatting happen in your browser; the network is never touched.
What size files can it handle?
Up to about 5 MB. Larger inputs are rejected with a clear notice instead of freezing the page.
Related tools
Base64 Encoder / Decoder
Convert text or files to Base64 and back, with correct UTF-8 handling.
PopularUnix Timestamp Converter
Convert Unix seconds or milliseconds to dates and back, in your timezone or UTC.
PopularImage Compressor
Compress JPG / PNG / WebP locally.
Coming soonIP Range ⇄ CIDR
Convert IP ranges to the smallest CIDR set (IPv4/IPv6).
Coming soonRegex Tester
Live matches, groups and replace preview.
Coming soonPassword Generator
Local entropy-based password generation.
Coming soon