How to Format and Validate JSON
Find commas, quotes, and brackets that cause parsing errors.
What it does and when to use it
Valid JSON uses double quotes for keys and strings and does not allow trailing commas. Formatting makes structure easier to inspect.
What information to enter
Paste JSON, then choose format for readability or minify for transport.
How to understand the result
Valid input becomes neatly indented. On invalid input, the error usually identifies where parsing stopped.
Recommended step-by-step workflow
- Check the assumptionsValid JSON uses double quotes for keys and strings and does not allow trailing commas. Formatting makes structure easier to inspect.
- Use matching unitsPaste JSON, then choose format for readability or minify for transport.
- Compare with another scenarioValid input becomes neatly indented. On invalid input, the error usually identifies where parsing stopped.
Short example
{"name":"CalcGo","active":true} is valid; an unquoted key is not standard JSON.
Common mistakes
- Pasting secrets, API keys, or personal data into tools you do not trust.
- Confusing a JavaScript object literal with strict JSON.
Frequently Asked Questions
Is the data sent to a server?
No. Formatting and validation run locally in the browser.
What does Minify do?
It removes whitespace without changing the data structure.
Are my personal inputs saved?
No. The calculators and guides are designed for quick browser use without storing your personal input values.