JSON Formatter vs JSON Validator
What's the difference? When to use each?
Formatting (Beautifying)
A JSON formatter takes minified or messy JSON and makes it readable. It adds indentation, line breaks, and consistent spacing. It does not check if the JSON is valid — it assumes (or tries to parse) the input.
Use when: You have valid JSON that's hard to read (e.g. from an API) and want to inspect it.
Validation (Syntax Checking)
A JSON validator checks whether a string is valid JSON. It reports syntax errors (missing commas, trailing commas, unquoted keys, etc.) and often shows the line/position of the error. It does not change the output — it only validates.
Use when: You're debugging malformed JSON or want to confirm data is valid before using it.
When to Use Each
- • Formatter only: You know the JSON is valid and just need it pretty-printed.
- • Validator only: You need to verify syntax without changing the output.
- • Both: You have unknown or messy JSON — validate first, then format if valid.
DuskTools Does Both
The DuskTools JSON Formatter combines formatting and validation in one tool. Paste any JSON — if it's valid, you get a beautified version; if not, you get clear error messages with line numbers. No need to switch between separate tools.