JSON formatter
Parse JSON locally, verify its syntax, and produce stable indentation for reading, review, or reuse.
Local processing
Result
Your result will appear here
The input stays available if you need to adjust a setting.
How to use json formatter
- 1
Paste JSON.
- 2
Choose indentation.
- 3
Format, then copy or download the result.
A realistic example
Expand a compact API response into two-space-indented JSON for debugging.
Supported formats and limits
Input and output: UTF-8 JSON text.
- JSON comments and trailing commas are invalid.
- Very large documents may consume noticeable browser memory.
Questions people ask
Does formatting change values?
No. It parses and serializes the same JSON data with new whitespace.
Can it format JSON5?
No. V1 follows standard JSON syntax.