Question 1

What is JSON and why does it need validation?

Accepted Answer

JSON (JavaScript Object Notation) is a lightweight data format for storing and exchanging data. Validation is needed because even a single misplaced comma, missing bracket, or unquoted key causes parsing to fail. The validator instantly identifies exactly where syntax errors occur.

Question 2

What are the most common JSON syntax errors?

Accepted Answer

The most common JSON errors are: trailing commas after the last array item or object property (not allowed in JSON), single-quoted strings (JSON requires double quotes), unquoted property keys, missing commas between elements, and improperly escaped special characters in strings.

Question 3

Does the JSON validator also check JSON Schema compliance?

Accepted Answer

The basic validator checks JSON syntax (RFC 8259 compliance). It ensures the JSON is well-formed and parseable. JSON Schema validation (checking structure and data types against a schema definition) is available as a separate feature for Pro users.

Question 4

Can I validate large JSON files?

Accepted Answer

Yes. The validator processes JSON entirely in your browser, so there are no server-side file size restrictions. Performance depends on your device, but files up to several megabytes are handled efficiently in modern browsers.

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