JSON Trailing Commas: The Error That Breaks Everything
Trailing commas in JSON cause parse errors. Learn why they're invalid, how to spot them, and how to configure editors and linters to catch them.
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Tags: json, developer-tools, beginner
JSON Trailing Commas: The Error That Breaks Everything A trailing comma is a comma placed after the last item in a list or the last property in an object, with nothing following it except a closing bracket. It looks harmless. It is one of the most common causes of JSON parse errors in the wild. This guide explains exactly what trailing commas are, why they break JSON, why developers keep adding them by accident, and how to find and fix them fast. Why JSON Doesn't Allow Trailing Commas The JSON specification (RFC 8259) defines strict grammar rules. An object is: A member must be followed by either a comma and another member, or a closing brace. A comma with nothing after it is not a valid state in this grammar. The designers could have allowed trailing commas — many other formats do. They…
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