JSON Input
How to use the JSON Formatter
1
Paste your JSON data into the input box above, or click "Load Sample" to try with example data.
2
Click "Format / Beautify" to make your JSON readable with proper indentation, or "Minify" to compact it.
3
Use "Validate" to check for syntax errors. Any errors will be shown with the line number.
4
Copy the formatted output with the "Copy" button.
About JSON Formatter
JSON (JavaScript Object Notation) is the most widely used data format for APIs and web applications. Poorly formatted JSON is difficult to read and debug. Our JSON Formatter instantly beautifies messy JSON into clean, indented structure.
The validator checks your JSON against the official JSON specification and reports exact error locations. The minifier removes all unnecessary whitespace to reduce file size — useful before deploying APIs or embedding JSON in code.
Frequently Asked Questions
Is my JSON data sent to any server? ▼
No. This JSON formatter runs entirely in your browser using JavaScript. Your data never leaves your device and is not sent to any server.
What is the difference between beautify and minify? ▼
Beautify (format) adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to create compact JSON — useful for reducing data transfer size in APIs.
What causes a JSON validation error? ▼
Common errors include missing commas between items, unquoted keys, trailing commas, single quotes instead of double quotes, or unclosed brackets. Our validator will tell you exactly where the error is.
How large can the JSON be? ▼
Since processing happens in your browser, performance depends on your device. Files up to 10MB typically work fine. For very large JSON files, consider using a desktop tool.
Can I format nested or deeply nested JSON? ▼
Yes. Our formatter handles any valid JSON structure — arrays of objects, deeply nested objects, mixed types — and formats them all correctly.