Can `json.Marshal()` Fail When Encoding a `map[string]string` in Go?

Can Marshalling a Map[string]string to JSON Return an Error?

Question:

Is it possible for json.Marshal() to return an error when marshalling a map[string]string?

Answer:

Generally, marshalling a map[string]string to JSON in Go should not result in an error. However, there are several scenarios where an error may occur:

• Out of Memory Error: If the JSON data exceeds the system memory, json.Marshal() will terminate the application with an error.
• Invalid UTF-8 Encoding: Go substitutes invalid UTF-8 characters with the Unicode replacement character U FFFD during marshalling. While this does not produce an error, it can result in unexpected JSON output.
• Concurrent Map Modification: In Go 1.6 and above, concurrent modification of a map can cause a runtime error. Both when the map[string]string is passed to json.Marshal() and during the marshalling process, the map should not be modified concurrently.

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