How it works

Paste JSON and pretty-print it with 2-space, 4-space, or tab indentation, or minify it to one line. Invalid JSON shows the parse error.

The tool parses your input with JSON.parse and re-serializes with JSON.stringify at the indent style you choose: 2 spaces (default, used by most JSON conventions), 4 spaces (Python / older Java style), tabs (some legacy tools), or 0 (minify to a single line). Status line shows a green check for valid JSON with byte counts in and out, or a red X with the exact parse error (line and column) for invalid input. Useful for debugging API responses, sanity-checking a config file, or compacting JSON before pasting into a cell that can't handle multi-line content. Keys are not reordered, formatting is structure-preserving. Output is a copyable, downloadable .json file.

How to use it

1. Paste your JSON. The status line shows a green check for valid input or the exact parse error with line and column.
2. Pick an indent style. 2 spaces, 4 spaces, tabs, or minify to a single line.
3. Copy or download. Grab the formatted output or download it as a .json file — key order is preserved.

Frequently asked questions

Why does my JSON show as invalid?

The status shows the parse error with location. Common causes: trailing commas (not allowed in standard JSON), single quotes (must be double), unquoted keys, unescaped backslashes.

Can I sort keys?

Not in this version. The output preserves the source order of keys.

What's the difference between minify and format?

Minify removes all whitespace (smallest possible). Format adds line breaks and indentation for readability.

Is my JSON uploaded?

No. Parsing and serializing happen in your browser.