JSON looks simple — just key-value pairs, right? But its strictness is legendary. No trailing commas. No comments. No single quotes. No undefined. Miss one rule and your entire payload is dead on arrival.
Even senior developers get caught by these. Not because they don't know JSON — because the spec is unforgiving in ways that feel arbitrary until you understand why those rules exist.
This article covers the 10 most common JSON errors, why they happen, and exactly how to fix them — with real-world code examples, not toy snippets.
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