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Free JSON Formatter — Beautify, Validate & Minify JSON Online
Format, validate, minify, and visualize JSON as an interactive tree.
About JSON Formatter
Paste messy, minified, or broken JSON and instantly format it into clean, indented, readable code with syntax highlighting. Also validates your JSON, pinpoints syntax errors with line numbers, and offers an interactive tree view to explore deeply nested objects. Supports minification for production use. The most-used developer tool on LootNestX — essential for API debugging, config file editing, and data inspection.
How to Use JSON Formatter
- 1Paste your JSON into the input area (it works with formatted, minified, or broken JSON)
- 2Click Format to prettify, or Validate to check for errors
- 3Use the Tree View tab to explore nested objects and arrays interactively
- 4Click Minify to compress JSON for production use
When to Use JSON Formatter
- ▸Debugging API responses by making minified JSON readable
- ▸Finding syntax errors in JSON with line-by-line error messages
- ▸Exploring deeply nested JSON objects in the interactive tree view
- ▸Minifying JSON for production to reduce bandwidth
Pro Tips
- 💡Bookmark this page if you work with APIs frequently — it's the fastest JSON debugger
- 💡Use the tree view for API responses with 3+ levels of nesting
Frequently Asked Questions
- What does the validator check for?
- It validates JSON syntax: matching braces and brackets, proper comma placement, valid string quoting (double quotes only), and supported value types. It highlights the exact line and position of any error.
- How do I fix a 'Unexpected token' error?
- This usually means you have trailing commas, single quotes instead of double quotes, or unquoted keys. The error message shows the exact location, and our formatter attempts to suggest fixes.