JSON Formatter
Beautify, minify, validate, and explore JSON with a collapsible tree view. Everything stays in your browser.
Input JSON
Paste JSON or upload a .json file.
Output
Formatted, minified, or tree view.
Click Beautify, Minify, or Tree View…Valid JSON · 0 bytes
By Vizo ToolLast updated August 20264 min read
JSON Formatter — Beautify, Minify & Validate JSON Online
The JSON Formatter cleans up messy JSON in seconds: paste or upload any JSON blob, hit Beautify for a perfectly indented, human-readable structure, or Minify to strip every unnecessary space. A collapsible tree view lets you explore nested data without reading braces.
Invalid JSON is never left to guesswork — the tool highlights the exact line and column of the error with a plain-English explanation. Everything runs locally in your browser, so even sensitive configuration or API payloads never leave your device.
- Beautify & minify
- Collapsible tree view
- Error line numbers
- 100% browser-based
Why Use JSON Formatter?
Instant Beautify
One click turns minified JSON into clean, 2-space indented output that is easy to read and diff.
Collapsible Tree View
Explore deeply nested objects and arrays with expand/collapse — no manual brace matching.
Precise Error Reporting
See the exact line, column, and a human-readable reason when your JSON is invalid.
100% Private
All parsing happens in your browser. Paste sensitive configs and API payloads with confidence.
Features
Beautify
Format JSON with 2-space indentation for readable output.
Minify
Strip whitespace to shrink JSON for storage or transmission.
Tree View
Interactive collapsible view of the parsed structure with copyable values.
Upload & Download
Load a .json file from disk and download the result with one click.
Copy Anywhere
Copy the formatted, minified, or a single tree node's value to the clipboard.
How to Format JSON
Make any JSON readable in three quick steps.
Paste or upload JSON
Type, paste, or load a .json file with invalid or minified content.
Choose an action
Click Beautify, Minify, or switch to the tree view for a visual structure.
Copy or download
Copy the output to your clipboard or download it as a .json file.
Frequently Asked Questions
Got questions? We've got answers.
What is a JSON formatter?▼
A JSON formatter takes raw or minified JSON and reformats it with proper indentation, making it readable. This tool also minifies JSON and validates it.
Is the JSON formatter free?▼
Yes, it is completely free with no sign-ups, limits, or watermarks.
Does it work on my private or sensitive data?▼
Yes — all parsing happens locally in your browser. Your JSON never leaves your device.
What does Beautify do?▼
Beautify parses your JSON and re-prints it with 2-space indentation so nested objects and arrays are easy to read.
What does Minify do?▼
Minify removes all unnecessary whitespace, producing the smallest valid JSON string — useful for storage or API payloads.
How does the tree view work?▼
The tree view renders your parsed JSON as collapsible nodes. Click arrows to expand objects and arrays, and click a value to copy it.
What happens if my JSON is invalid?▼
The tool shows the exact line and column of the error with a plain-English explanation, so you can fix it immediately.
Can I format a file?▼
Yes, upload any .json file and the tool reads it into the editor automatically. You can also download the result as a .json file.
Does it support large JSON?▼
It handles large payloads comfortably in modern browsers, though extremely large files (tens of MB) can be slower.
Does it work on mobile?▼
Yes, the tool is fully responsive and works on desktop, tablet, and mobile browsers.
Can I copy just one value from the tree?▼
Yes — in the tree view, clicking a scalar value copies it to your clipboard without copying the whole document.
Why should I minify JSON?▼
Minified JSON is smaller, which reduces bandwidth, storage costs, and payload transfer time in APIs and databases.
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