Paste messy JSON and instantly beautify it with syntax highlighting, compress it to a single line, or validate it to find errors. Free, unlimited, and everything runs locally in your browser — your data never leaves your device.
How to use the JSON Formatter
- Paste your JSON into the input box (or click Load sample to try it out).
- Click ✨ Format / Beautify for readable, syntax-highlighted JSON, Minify to compress it to one line, or Validate to check it.
- If the JSON is invalid, you’ll get a clear error message pointing at the problem. Click Copy result when you’re happy.
Frequently asked questions
What is JSON formatting?
Formatting (beautifying) adds consistent indentation and line breaks to JSON so humans can read it easily. Minifying does the opposite — removing all unnecessary whitespace to make payloads smaller.
Why is my JSON invalid?
Common culprits are trailing commas, single quotes instead of double quotes, unquoted keys, and comments. The validator’s error message tells you exactly what the parser choked on.
Is my data uploaded to a server?
No. Parsing and formatting happen entirely in your browser with JavaScript’s built-in JSON engine. Your data never leaves your device.