Free JSON Formatter & Validator
Paste messy JSON and pretty-print it with one click — or minify it for APIs and storage. The validator pinpoints syntax errors with clear messages.
How to use
- Paste your JSON into the input box.
- Click Format to pretty-print, Minify to compress, or Validate to check it.
- Copy the clean output with one click.
Frequently asked questions
What does Format do?
It pretty-prints compact JSON with 2-space indentation so nested objects and arrays are easy to read.
What does Minify do?
It strips all unnecessary whitespace, producing the smallest valid JSON — ideal for APIs, configs and storage.
How do I read a validation error?
The message names the problem and often the position, for example “Unexpected token } in JSON at position 42” — check that spot for a missing quote or comma.
Is my JSON data private?
Yes. Parsing and formatting run entirely in your browser; nothing is uploaded anywhere.