JSON Formatter & Validator
Paste JSON to format, validate, minify or beautify — everything runs in your browser
How to Use
Paste or type JSON into the input panel. Click Format to pretty-print with syntax highlighting, or Minify to compress. The tool validates your JSON automatically and shows errors with line numbers. Use the indent selector to switch between 2 spaces, 4 spaces, or tabs.
What This Tool Does
This JSON formatter parses your input with the native JSON.parse() method, validates the structure, then re-serialises it with your chosen indentation. It adds syntax highlighting for strings, numbers, booleans, nulls and keys. Invalid JSON shows the exact error position so you can fix it quickly.
Is My Data Safe?
Yes. This tool runs entirely in your browser using JavaScript. Your JSON is never sent to any server. There's no backend, no API call, no logging. You can verify this by opening your browser's network tab — you'll see zero requests when formatting.
What Is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It's easy for humans to read and write, and easy for machines to parse. JSON is the standard format for API responses, configuration files, and data storage across virtually every programming language and framework.