Code & data
JSON formatter & validator
Format, validate, and minify JSON online with readable error messages. Choose indentation, copy the result, or download a JSON file.
Free to useNo sign-upOn your device
Opening your workspace…
How to use it
- 01
Paste JSON or load the example.
- 02
Choose indentation, then Format or Minify.
- 03
Fix any validation error and copy or download the valid result.
A few useful answers
Does this accept comments or trailing commas?
No. This validates standard JSON. Comments, trailing commas, and single-quoted strings are not valid JSON.
Is API data sent anywhere?
No. Formatting and validation happen in your browser. Clearing the workspace removes its current contents.