About this JSON Formatter & Validator
JSON Formatter & Validator helps developers and data users spot syntax errors and turn compact JSON into a readable structure.
Formula or method
The browser JSON parser validates syntax; valid data is serialized with two-space indentation.
Example
A compact object such as {"a":1,"b":2} is displayed across readable indented lines.
Common uses
- Validate API payloads.
- Pretty-print minified JSON.
- Inspect nested objects and arrays more easily.
How to use this tool
- Enter the values or text requested by the calculator.
- Choose units or options when the tool provides them.
- Select the calculation button and review the result.
- Use the formula, example and notes on this page to check whether the result fits your situation.
Important note
JSON does not allow comments, trailing commas or unquoted object keys.
Frequently asked questions
Does it repair invalid JSON automatically?
No. It reports the parser error so you can correct the source intentionally.
What indentation is used?
The formatter uses two spaces per nesting level.