JSON Syntax Guide: Rules, Gotchas, and Valid Examples
JSON syntax guide: rules for strings, numbers, booleans, null, objects, and arrays. Common gotchas and valid/invalid examples for every data type.
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Tags: json, developer-tools, beginner
JSON Syntax Guide: Rules, Gotchas, and Valid Examples JSON has exactly six syntax rules. Follow all six, and any parser in any language will accept your document. Break even one, and you get an error. This guide covers each rule with a valid example, an invalid example, and a plain explanation of what goes wrong. A good rule of thumb before diving in: when you are not sure if your JSON is valid, paste it into a formatter and let it tell you. Try it free at theproductguy.in/tools/json-formatter — it highlights errors inline so you can find the exact line that's broken. Rule 2: No Trailing Commas A comma separates items in an array or object. The last item must not be followed by a comma. Valid: Invalid: The comma after is a trailing comma. The parser expects either another key-value pair…
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