JSON Formatter & Validator
Beautify, minify and validate JSON
About this tool
Paste any JSON payload to format it with readable indentation, minify it to a single line, or validate its structure before you ship. Clear error messages help you spot trailing commas, missing brackets, and encoding issues quickly.
Developers use this when debugging API responses, cleaning config files, or preparing examples for documentation. Everything runs in your browser, so tokens and secrets never leave your device.
How to use it
- Paste or type your JSON into the input panel.
- Choose an indent style (2 spaces, 4 spaces, or tabs) or pick Minify.
- Click Format or Minify to transform the payload instantly.
- Copy the result, or fix any validation error highlighted in the editor.
Common use cases
- Beautify messy API responses while debugging.
- Minify JSON before embedding it in scripts or storage.
- Validate config files (package manifests, CI configs, feature flags).
- Share readable JSON snippets in tickets or docs without uploading data.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting and validation happen entirely in your browser. Sensitive payloads never leave your device.
Which indent options are available?
You can format with 2 spaces, 4 spaces, or tabs, or minify to remove insignificant whitespace.
What happens if the JSON is invalid?
The tool reports a clear validation error so you can fix syntax issues before continuing.
Can I format large JSON files?
Yes for typical payloads. Extremely large documents may be limited by your browser’s memory, but no file is uploaded.
Does formatting change my data?
No. Pretty-print and minify only change whitespace. Object keys and values stay the same.