Common JSON Errors in JS, Python, and Postgres Mapped to Their Fixes

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A comprehensive reference guide maps the most frequent JSON errors to their root causes and solutions across JavaScript, Python, and PostgreSQL. In JavaScript, common issues include unexpected tokens, circular structure references, and truncated documents when using JSON.parse() or JSON.stringify(). Python developers often encounter JSONDecodeError variants caused by single-quoted keys, Python dict literals, or non-JSON response bodies. PostgreSQL throws syntax errors when JSON values are inserted using single quotes, empty strings, or double-encoded data. Across all platforms, the most widespread mistakes include trailing commas, unquoted or single-quoted keys, JavaScript-style comments, wrong boolean/null literals, and invalid numeric formats like NaN or leading zeros.

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