JsonForge · JSON errors
Trailing comma in a JSON array
The same rule as objects: no comma after the last element.
The smallest input that causes it
[1, 2, 3,]
JSON.parse on that gives, verbatim:
Unexpected token ']', "[1, 2, 3,]" is not valid JSON
The fix
[1, 2, 3]
That version parses.
Find it in your own document
Paste the JSON and get the error located by line and column, the document formatted, a schema inferred from it, and a diff against another version.
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