JSON Trailing Comma: Find the Line, or Switch to JSONC
One comma before } or ] breaks the parse. Compare the Node.js and Python messages, find the line in a browser-only formatter, and check which of JSONC and JSON5 still accept it.
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One comma before } or ] breaks the parse. Compare the Node.js and Python messages, find the line in a browser-only formatter, and check which of JSONC and JSON5 still accept it.
Fix JSON parse errors fast: "undefined" is not valid JSON, "[object Object]" is not valid JSON, and the older unexpected token u/o at position 0 wording. In-browser, no upload.