Developer — Free

Format and validate JSON

Pretty-print, minify and validate JSON with precise error messages.

Paste text to begin. Free

Input

Output

01 — Steps

How to format and validate JSON

Paste JSON
From an API response, config file or log.
Format or minify
Choose 2 or 4 spaces, tabs, or minified. Keys can be sorted.
Fix errors
Invalid JSON shows the line and column of the problem.

02 — Questions

Can it handle large files?

Yes. Multi-megabyte documents format in well under a second.

Does it support comments or trailing commas?

Strict JSON does not allow them, and the validator flags them. Use the relaxed option to strip comments and trailing commas first.

Can I sort keys?

Yes. Turn on key sorting to order object keys alphabetically at every level.

04 — More