How to use
- Paste or type your JSON into the input box.
- Choose an indent size, then click Format, Minify or Validate.
- Copy the formatted or minified output.
Frequently asked questions
What does Validate do?
It parses your JSON and reports whether it is valid, showing the exact error message and position if it is not.
What is the difference between Format and Minify?
Format pretty-prints JSON with indentation for readability; Minify strips all whitespace to produce the smallest possible string.
Is my JSON uploaded anywhere?
No. Parsing and formatting happen locally in your browser, so your data never leaves your device.
About this tool
Beautify, validate or minify JSON with adjustable indentation. Paste your data, fix syntax errors instantly and copy the result. Runs fully in your browser — nothing is uploaded.