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Jsonr
The fastest, cleanest JSON formatter online. Paste raw JSON, get formatted output instantly. No sign-up, no server, no fuss. Your data never leaves your browser.
What It Does
Jsonr is a browser-based JSON formatter. Paste messy, single-line, or minified JSON and get clean, indented output in milliseconds. It also validates your JSON and pinpoints syntax errors with line and column numbers. Need to go the other way? Minify formatted JSON to a single line for smaller payloads.
How It Works
Auto-formatFormats instantly when you paste. No button to click.
MinifyCollapse formatted JSON to a single line for smaller payloads.
ValidatePinpoints syntax errors with line and column numbers.
One-click copyCopy the formatted or minified result to your clipboard.
Syntax colorsColor-coded strings, numbers, booleans, and null values.
Light & darkFollows your system preference or switch manually.
Who It's For
- Backend developers debugging API responses that arrive as a wall of text.
- Frontend developers inspecting complex state objects or GraphQL payloads.
- DevOps engineers validating config files before a deploy.
- Anyone who needs to clean up JSON before pasting it into documentation, Slack, or a bug report.
Why “Jsonr”?
JSON + “r” for formatter. Short, easy to type, easy to remember.
100% client-side
Your JSON never leaves your browser. Everything runs locally via JSON.parse() + JSON.stringify(). No accounts, no tracking, no server calls.
See our Privacy Policy for details.