Your formatted JSON will appear here.
Your JSON is processed entirely in your browser — nothing is uploaded or stored.
Why tidy JSON saves real debugging time
A wall of unformatted JSON hides its own structure. One missing comma can sit anywhere in thousands of characters, with no landmarks for your eyes. Formatting spreads the data across indented lines that mirror how objects and lists nest, so mismatched brackets and stray characters stand out. It is usually the first step before reading or fixing data from an API.
What to do, step by step
- Paste your JSON into the box at the top of this page.
- Click Format to spread it into readable, indented lines.
- If it will not format, click Validate to confirm there is an error to hunt.
- Check the usual culprits: trailing commas, single quotes, and keys without double quotes.
- Use Minify for the compact version, then Copy output to take it with you.
JSON FAQs
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, human-readable data format used everywhere on the web — APIs, config files, and apps use it to exchange structured data. It stores information as key-value pairs and lists, like {"name":"Ada"}.
Why is my JSON invalid?
JSON is strict. The most common culprits are trailing commas after the last item in an object or array, single quotes instead of double quotes, unquoted keys, or comments. Every key must be wrapped in double quotes and commas must separate — not trail — items.
Is my data sent to a server?
No. This formatter runs entirely in your browser using JavaScript. Your JSON never leaves your device — nothing is uploaded, saved, or logged anywhere.
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