Trailing Commas in JSON: Why Does Go\'s Rule Break Down?

Trailing Commas in JSON: A Runtime Headache

Despite the guidance to include trailing commas in composite literals in Go, this rule seems to fail when parsing JSON. As demonstrated in the provided code example, removing the trailing comma allows the parser to succeed.

Is there a resolution that preserves the trailing comma syntax?

Answer:

Unfortunately, there is no solution. The JSON specification explicitly forbids trailing commas. Including one invalidates the JSON document, causing errors parsing in valid JSON parsers.

Why doesn't Go's trailing comma rule apply here?

Go's trailing comma rule originates from the language's syntax, not the JSON specification. In non-JSON contexts, trailing commas are necessary to separate elements in composite literals. However, in JSON, they serve a different purpose: to delimit values in an array or object.

Best practices:

To avoid runtime errors caused by trailing commas in JSON, adhere to the JSON specification and omit trailing commas from JSON text. Although it may not fully align with Go's internal syntax, it ensures compatibility with other JSON parsers and prevents unnecessary parsing failures.

The above is the detailed content of Trailing Commas in JSON: Why Does Go\'s Rule Break Down?. For more information, please follow other related articles on the PHP Chinese website!