JSON Formatter
Pretty-print or minify JSON in the browser. Live update as you type.
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A JSON formatter takes compact or malformed JSON and returns a re-indented, human-readable version. Converterzilla's formatter runs entirely in your browser — your payload never leaves your computer, there's no file-size limit, and the result updates as you type. Switch between pretty-print and minify with one click; if your input has a syntax error, the parser tells you exactly which character is wrong.
How to use JSON Formatter in your browser
- Paste your JSON. Drop a .json file or paste content into the left panel.
- Pick a mode. Pretty-print (2-space indent) or minify (single line).
- Copy or download. Use the buttons under the output to grab the result.
Why use Converterzilla for JSON Formatter
100% browser-based
Uses the native JSON.parse/JSON.stringify — fast, deterministic, offline-capable.
Real-time errors
Syntax errors highlight on every keystroke; no need to click 'validate' first.
Privacy by design
Nothing uploaded, nothing logged, no API limits.
Frequently asked questions about JSON Formatter
No — we target standard RFC 8259 JSON to keep output safely round-trippable into any consumer.
JavaScript numbers are IEEE 754 doubles; integers beyond 2^53 may lose precision. If you need BigInt support, use a server-side tool instead.
Almost always a backslash inside a string that isn't a valid escape (\\\, \\n, \\"). Double the backslash to fix.