JSON Formatter & Validator
Validate, format, minify, sort, and inspect JSON with indentation controls and a collapsible tree. Export YAML, or convert to CSV when the JSON shape supports rows and columns.
{ }
Input
Paste or type JSON
✦
Output
Output will appear here…
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How to Format JSON
- Paste your JSON — Copy your JSON and paste it into the input area. Output formats automatically as you type.
- Explore the tree — Click ▾ toggles to collapse/expand any object or array node. Use Collapse All / Expand All to navigate large structures.
- Copy or Download — Copy the formatted output to your clipboard or download it as a .json file.
- Search or bookmark — Use the sidebar to search keys, values, regex, or a path like
a.b[0].c, or save the current JSON as a local bookmark for later.
Features
- Live auto-format as you type (200ms debounce)
- Collapsible nodes — collapse any {} or [] instantly
- Syntax highlighting with color-coded tokens
- JSON validation with exact error position
- Minify JSON to reduce file size
- Upload .json files directly
- Download formatted output as .json
- YAML export and CSV conversion for supported JSON shapes
- Search by key, value, regex, or path with highlighted matches
- Local bookmarks — save JSON snippets in your browser for later
JSON Formatter: validate, sort, inspect, and convert
Use JSON Formatter to parse JSON, format it with 2 spaces, 4 spaces, or tabs, sort object keys, and inspect nested values in a collapsible tree. The tool can also minify valid JSON for compact output.
Example workflow
Paste an API response, format it with 2-space indentation, sort keys to compare objects, then use the validation message to find syntax problems before downloading formatted.json.
Limits to check
- Valid JSON required: Formatting, minifying, and conversion depend on successful JSON parsing.
- CSV shape: CSV conversion works for objects or arrays of objects, not every JSON value.
- Large input: Very large JSON can be limited by browser memory and rendering time.
For the next step, try Regex Tester & Log Extractor, Base64 Encoder & Decoder, Hash Generator, Unix Timestamp Converter.
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Frequently Asked Questions
What is a JSON formatter?
A JSON formatter parses raw or minified JSON and writes it back with readable indentation and line breaks.
Can this tool validate JSON?
Yes. The page parses your input with JSON.parse and shows a syntax error message when the JSON is invalid.
Can I convert JSON to CSV?
CSV conversion works when the JSON is an object or an array of objects. Other JSON shapes should stay in JSON or YAML output.
What is JSON minification?
Minification removes unnecessary whitespace and line breaks from valid JSON while preserving the parsed data.
What file types can I upload?
You can upload a .json file using the Upload button. The file is loaded into the input area for formatting or validation.
How does JSON search work?
Search the key, value, or both, with plain text, regex, or a dot/bracket path like a.b[0].c. Matches are highlighted and you can jump between them with the Prev/Next buttons.
Are bookmarks saved online?
No. Bookmarks are stored only in your browser's local storage, so they stay on this device and are never uploaded.
