JSON Syntax Error: Unexpected Token, Missing Comma, and Other Fixes
Fix JSON syntax errors: unexpected token, missing comma, trailing comma, unterminated string. Includes error messages and corrected code examples.
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Tags: json, developer-tools, debugging
JSON Syntax Error: Unexpected Token, Missing Comma, and Other Fixes JSON syntax errors are some of the most common bugs developers encounter, and they're almost always caused by the same handful of mistakes. This guide shows 8+ real error patterns — the invalid input, the error message it produces, and the corrected version — so you can recognize and fix them without guesswork. The JSON specification (RFC 8259) is deliberately minimal. It has no comments, no trailing commas, no unquoted keys, and no special values beyond , , and . Every deviation from those rules is a syntax error. Here's what they look like in practice. Error 2: Trailing Comma in an Array Same problem, different structure. Arrays are at least as common as objects in API payloads. Invalid: Error message: Fixed: --- Error…
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