JSON Formatter & Validator
Beautify, minify and validate — with errors you can actually find.
- No uploads
- Validates as you type
- Keyboard friendly
- Free, no sign-up
Drop a JSON file
or browse — or paste into the input below
Processed on your device — never uploaded
JSON input
Tip: press Ctrl/⌘+Enter to run immediately.
Formatted output
Format, validate and minify JSON
Paste messy, minified or hand-written JSON and Lindajzmin turns it into neatly indented, colour-highlighted output — or squeezes it down to a single line for production. Validation runs as you type.
When something is wrong, you get a plain-English explanation and the exact line and column of the problem, plus a button that jumps your cursor straight to it. Common mistakes such as trailing commas, single quotes and unquoted keys are called out by name.
How to use it
- Paste JSON or drop a .json file.
- Pick Beautify or Minify and your indentation.
- Copy or download the result.
Features
- Beautify with 2 spaces, 4 spaces or tabs
- Minify for the smallest payload
- Precise error line/column with jump-to-error
- Optional recursive key sorting
- Syntax highlighting in light and dark mode
- Stats: root type, keys, depth and value count