Can JSON Marshaling of a Go `map[string]string` Fail, and Why?

Can Marshaling a Map[String]String to JSON Result in an Error?

When utilizing the json.Marshal function to convert a map[string]string to JSON format, the question arises whether any scenarios could cause the operation to fail with an error.

Theoretically, json.Marshal should not encounter any errors when marshaling a map[string]string. Valid JSON keys and values permit any valid string, including non-UTF-8 encoded sequences. If a non-UTF-8 encoded string is encountered, it is replaced with the Unicode replacement character (U FFFD).

However, the documentation for json.Marshal does not explicitly guarantee a nil error when marshaling a map[string]string. Therefore, it is good practice to check for errors as a preventive measure. Additionally, unforeseen bugs or limitations within the standard library could potentially cause errors in the future.

Exception: Concurrent Map Modification

Introducing concurrent modification of the map during the json.Marshal operation can lead to a runtime crash. Go 1.6 introduced concurrent misuse detection for maps, which triggers if a map is modified during iteration without proper synchronization. This behavior ensures data integrity but may interrupt json.Marshal and cause the application to terminate.

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