JSON Beautifier
Pretty-print messy or minified JSON with the indentation you choose — or set indent 0 to minify. Invalid JSON is reported with the exact spot. Runs in your browser; nothing is uploaded.
About this tool
JSON Beautifier reformats minified or messy JSON into clean, readable text — with the indentation you choose — and validates it along the way.
- Indent sets the spaces per level (1–8). Set indent to 0 to minify instead: the whole document collapses to one compact line.
- Validation built in: if the JSON is malformed, you get the parser's exact message (with line/column) instead of broken output.
- Key order is preserved — objects come out in the same order you wrote them, not alphabetically sorted.
Everything runs locally in your browser via WebAssembly — your data is never uploaded.
Handy for
- Making an API response or config readable.
- Minifying JSON before embedding it somewhere size-sensitive.
- Quickly checking whether a blob is valid JSON and where it breaks.
FAQ
How do I minify instead of pretty-print?
Set the indent to 0. The document is still parsed and validated, then re-serialized as one compact line with all insignificant whitespace removed — ideal before embedding JSON in a URL, env var, or HTTP header.
Will my object keys get re-sorted?
No. Key order is preserved exactly as written — {"b":1,"a":2} stays b
before a after formatting. Only whitespace changes, so diffs against the
original stay meaningful.
Why does it reject JSON with trailing commas or comments?
Because they aren't valid JSON — the tool is also a validator, so it parses
strictly and reports the parser's exact message with the line and column of
the first problem (e.g. [1,2,] fails on the trailing comma). JSON5/JSONC
extensions like comments or unquoted keys are reported as errors too.
What indentation sizes are supported?
Anything from 1 to 8 spaces per level (default 2); larger values are clamped to 8, and 0 switches to minify mode. Tabs aren't offered — the indent is always spaces.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool json-beautify '{"name":"gizza","tags":["fast","local"]}'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/json-beautify/?json=%7B%22name%22%3A%22gizza%22%2C%22tags%22%3A%5B%22fast%22%2C%22local%22%5D%7D&indent=2Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.