Updated June 2026 · runs 100% in your browser
JSON Formatter
Beautify, validate and minify JSON. Paste, convert, copy or download — on your device, no upload.
🔒 Processed on your device · 0 bytes uploaded
How it works
Paste your JSON, choose an indent (or tick Minify) and press Convert. Invalid JSON is reported with the error.
It all runs in your browser with JavaScript, so your data never leaves your device. It stays free, unlimited and private, and works offline once loaded.
About JSON Formatter
A formatter re-indents JSON so it is readable, flags syntax errors, and can also minify it to a single line. It is the quickest way to sanity-check a JSON blob.
Frequently asked questions
How do I use JSON Formatter?
Paste your JSON, choose an indent (or tick Minify) and press Convert. Invalid JSON is reported with the error.
What does "minify" do?
It removes all whitespace and newlines so the JSON is one compact line — handy for embedding or shrinking payloads.
Is my data uploaded?
No. Everything is parsed and converted in your browser with JavaScript — your data is never sent to a server.
What is a JSON file?
JSON (JavaScript Object Notation) is a lightweight, human-readable text format for structured data. It's the standard for web APIs and config files because both people and programs read it easily.