Question 1

What is JSON validation?

Accepted Answer

JSON validation checks whether a string conforms to the JSON syntax standard (RFC 8259). A validator parses the input and reports errors like missing quotes, trailing commas, or mismatched brackets.

Question 2

What are common JSON errors?

Accepted Answer

The most common JSON errors are trailing commas after the last item in an array or object, unquoted or single-quoted keys, missing closing brackets, and unescaped special characters inside strings.

Question 3

What is the difference between a JSON validator and a JSON formatter?

Accepted Answer

A JSON formatter pretty-prints and indents JSON for readability. A JSON validator strictly checks syntax and reports the exact error location without modifying the input.

Question 4

What is RFC 8259?

Accepted Answer

RFC 8259 is the Internet Standard that defines the JSON data-interchange format. It specifies that all keys must be double-quoted strings and that trailing commas, comments, and undefined values are not permitted.

Question 5

When should I validate JSON?

Accepted Answer

Validate JSON before sending it to an API, when debugging failed network requests, when editing configuration files by hand, or when integrating data from external sources.

Question 6

Why does JSON reject comments?

Accepted Answer

The JSON specification was intentionally designed without comments to keep parsing simple and deterministic. If you need comments, use JSONC or JSON5, which are supersets of JSON that allow them.

Question 7

Are there number precision issues in JSON?

Accepted Answer

JSON numbers are parsed as IEEE 754 double-precision floats. Integers larger than 2^53 lose precision. For large IDs or financial values, represent them as strings instead.

Question 8

Is my JSON data safe to paste here?

Accepted Answer

Yes. All validation runs entirely in your browser using JavaScript. No data is sent to any server, so API keys, tokens, and other sensitive JSON are completely safe.

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