Question 1

What makes JSON invalid?

Accepted Answer

Common causes: trailing commas, single-quoted strings (must use double quotes), comments (not supported), undefined or NaN values, missing commas between items, and unmatched brackets.

Question 2

Does this send my JSON to a server?

Accepted Answer

No. Validation runs entirely in your browser using JavaScript's JSON.parse. Nothing is uploaded.

Question 3

What is the difference between validation and formatting?

Accepted Answer

Validation checks whether JSON is syntactically correct. Formatting is an extra step that adds indentation to make valid JSON more readable.

JSON Validator

Frequently Asked Questions

JSON Validator

Frequently Asked Questions

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