Inspect an API response
Indent a compact response so nested keys are easier to scan.
JSON VALIDATOR AND FORMATTER
Validate, format,
and minify JSON.
Check syntax, add indentation, create a one-line version, and inspect the root type, keys, array items, depth, and UTF-8 size.
Formatted result
Root type—
Total keys—
Array items—
Maximum depth—
UTF-8 size—
HOW TO USE
Format in three steps
- Paste a JSON value into the input.
- Choose two or four spaces for indentation.
- Format, minify, or copy the result.
EXAMPLES
Common uses
Minify configuration
Turn formatted JSON into a single line before copying it into a setting.
Summarize structure
Review the root type, total keys, array items, depth, and UTF-8 byte size.
Local processing
No external API is needed to parse or format the input.
Standard browser JavaScript performs all operations on this device.
How validation works
The tool parses standard JSON in browser memory and serializes the same data structure again.
Only standard JSON is accepted
Keys and strings require double quotes. Comments, single quotes, trailing commas, JSON5, and JavaScript object syntax are not supported.
Formatting does not change values
Prettifying and minifying only change whitespace around a successfully parsed structure.
Protect sensitive and large data
Input is not sent by this page, but screen sharing and extensions are separate risks. Very large JSON can be slow on limited devices.