What is a JSON formatter?
JSON is the most common format for exchanging data between front and back end, but machine-generated JSON is often crammed into one unreadable line. This online JSON formatter instantly beautifies messy JSON into a clear indented structure — or minifies it to the smallest size — while validating the syntax and pinpointing errors.
How to use
- Paste your JSON into the input box on the left.
- Choose the indentation (2 spaces, 4 spaces or Tab).
- Click Beautify to make it readable, or Minify to collapse it to one line.
- The result appears on the right and can be copied in one click. If the JSON is invalid, the status bar explains why.
Common use cases
- Inspect the structure of an API response.
- Normalize config files to a consistent indentation style.
- Minify JSON before shipping to reduce payload size.
- Validate hand-written JSON before your code parses it.