How do you find common JSON validation errors?
A systematic approach to single quotes, trailing commas, unquoted keys, and invalid numbers.
The most common JSON errors are single quotes, trailing commas, unquoted object keys, and values such as `NaN` or `undefined` that JSON does not support. After locating the parser position, also inspect the previous comma, quote, and closing delimiter.
What changed in this update?
The debugging sequence and JSON versus JavaScript object differences were added.
What are the core valid JSON rules?
Object keys and string values use double quotes; the last item in an array or object has no trailing comma. Numbers must be finite and comments are not allowed.
Why can the error position look wrong?
A parser often reports where it can no longer continue, not where the malformed structure began. Inspect nearby quotes, backslashes, commas, and brackets before the reported position.
How should JSON be minified safely?
Parse the input first, then serialize it with `JSON.stringify`. Removing whitespace with a regular expression can damage meaningful spaces and escapes inside strings.
Frequently asked questions
Does JSON support comments?
Standard JSON does not support comments.
How should dates be stored in JSON?
JSON has no date type; use a documented ISO 8601 string or numeric timestamp.