JSON is the language of APIs. Every developer works with it daily. But how often do you actually look at the structure of what you're parsing?
Formatting is debugging. A minified JSON blob from an API response is unreadable. One missing comma or mismatched bracket and you're staring at a parse error with no clue where it broke. A good formatter does two things: indentation and error location. Paste your blob, and the tool tells you exactly which line has the problem.
Tree view reveals hidden structure. Flat key-value pairs are easy. Nested arrays of objects with optional fields are not. A tree view collapses what you don't need and expands what matters. When debugging a deeply nested API response, the visual hierarchy saves ten minutes of squinting.
Schema inference for reverse-engineering. Pasted a response from an undocumented API? Schema inference guesses the types and structure. You get a blueprint of what fields exist, what types they are, and which are optional. It's like documentation, but extracted from real data.
Common JSON mistakes: Trailing commas (invalid in strict JSON), unquoted keys (valid in JavaScript, invalid in JSON), single quotes (JSON requires double quotes), and undefined values (JSON doesn't support undefined, use null instead).
Our JSON formatter handles all of these and shows you exactly where each error is.