Dev Tools
JSON Formatter & Validator
The JSON Formatter & Validator pretty-prints messy or minified JSON into clean, indented, readable formatting, or minifies it down to a single compact line — and it validates the JSON along the way, pointing out exactly where a syntax error is if something's broken.
It's built for the daily grind of working with APIs: pasting in a raw API response to actually read it, checking a config file for a stray comma or missing bracket, or shrinking a JSON payload before sending it somewhere size-constrained.
How to Use the JSON Formatter & Validator
- Open the JSON Formatter & Validator (button below).
- Paste your JSON into the input box.
- Click Format to pretty-print it (or Minify to compact it) — any syntax errors are called out with a clear message and location.
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Frequently Asked Questions
What happens if my JSON has a syntax error?
The tool tells you it's invalid and points to where the problem is — a missing comma, unclosed bracket, trailing comma, or similar — instead of just failing silently.
Is my JSON data uploaded anywhere?
No — parsing and formatting both happen locally using your browser's own JSON engine. Nothing you paste is sent to a server, which matters if the JSON contains sensitive data.
What's the difference between Format and Minify?
Format expands the JSON with indentation and line breaks so it's easy to read. Minify strips all unnecessary whitespace to produce the smallest possible payload — useful before sending JSON over a network.