Paste messy JSON and get a clean, syntax-highlighted version instantly. Validates structure, finds errors with line numbers, and lets you minify too.
JSON (JavaScript Object Notation) is the most common format for exchanging data between web servers and applications. Real-world JSON often arrives compressed onto a single line — hard for humans to read or debug.
This tool formats messy JSON into a clean indented version, validates the syntax and tells you exactly where the error is, and minifies it back into one compact line for production. Everything runs in your browser — your data never leaves your device.