JSON formatter
Format JSON with readable indentation.
JSON formatter
Type or paste to update the result automatically.
Your result appears here
Type, paste, or use an example. Copy your result when it is ready.
How to use JSON formatter
JSON formatter takes strict JSON and returns the same data with readable line breaks and indentation. You can set 1 to 8 indent spaces or switch to tabs, sort object keys alphabetically, and end the output with a newline. Integers beyond the exact safe range are rejected instead of being silently rounded.
- Type or paste your source, or load an example.
- Change the basic settings or open Advanced mode to fine-tune the result.
- Review and copy or download your result. Pause Live results to run manually. Sources or individual settings above 20,000 characters require an explicit run.
What this tool supports
Accepts strict JSON. Trailing commas, comments, single quotes and nonfinite numbers are invalid. Formatting preserves parsed values; duplicate keys follow JSON.parse semantics, so only their final value remains.
- Indent spaces
- Range: 1 to 8
- Sort object keys alphabetically
- Set this value for your task.
- End with a newline
- Set this value for your task.
- Indentation style
- Spaces · Tabs
Limits and processing
Text operations generally accept up to 2,000,000 characters. Individual parsers, generators and formulas apply additional limits shown by their controls.
Example source
{"name":"ToolCabana","count":2}Frequently asked questions
Can I format JSON with tabs instead of spaces?
Yes. Open Advanced mode and set Indentation style to Tabs. With Spaces selected, the Indent spaces setting accepts any whole number from 1 to 8, and the default is 2.
Does the JSON formatter accept trailing commas or comments?
No. It accepts strict JSON only, so trailing commas, comments, single quotes and nonfinite numbers produce an error that names the line and column where parsing failed.
What happens to duplicate keys when I format JSON?
Duplicate keys follow standard JSON.parse behavior, so only the last value for a repeated key remains in the formatted output. Check the source if earlier values matter to you.
Where is my input processed?
This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.
What are the input limits?
Text operations generally accept up to 2,000,000 characters. Individual parsers, generators and formulas apply additional limits shown by their controls.