JSON Formatter & Validator

Pretty-print, minify, validate and inspect JSON with a tree view.

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Files and text are processed locally in your browser. Tools that must reach the network say so explicitly.

About the JSON Formatter & Validator

Format, validate and inspect JSON. The Toolcenter JSON Formatter pretty-prints with 2, 4 or tab indentation, minifies to one line, validates with line-and-column error messages, and offers a collapsible tree view plus key-count and depth stats. Everything runs in your browser.

How to use it

1Paste JSON into the input box.
2See instant validation feedback.
3Click Format or Minify, or set the indent size.
4Switch to the tree view to explore the structure.

Key features

Pretty-print with 2, 4 or tab indent
One-click minify
Validation with line and column of the error
Collapsible tree view
Size, key-count and depth stats

Frequently asked questions

Why is my JSON invalid?+

The tool shows the exact line and column of the parse error — usually a trailing comma, a missing quote, or single quotes instead of double.

Does it change my data?+

No. Formatting and minifying only change whitespace; the parsed values are identical.

How large a file can it handle?+

Multi-megabyte JSON works, limited by browser memory. The tree view lazily expands to stay responsive.

Is my JSON uploaded?+

No. Parsing and formatting are entirely local.

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