How Can I Achieve Case-Sensitive JSON Unmarshaling in Go?

Case-Sensitive JSON Unmarshal: A Technical Inquiry

In the realm of JSON processing, the json.Unmarshal function stands as a cornerstone for parsing JSON data into Go structs. However, a common quandary arises when dealing with case-insensitive matching during the unmarshaling process. This issue stems from the fact that json.Unmarshal, by default, accepts both exact and case-insensitive matches between JSON object keys and struct field names.

Consider the following scenario: you receive a JSON object containing two tags, "e" and "E," and you wish to unmarshal the object into a struct with only the "e" tag. Faced with this challenge, you may be tempted to resort to a simplistic workaround, such as defining a struct with both "e" and "E" tags and subsequently ignoring the "E" tag.

While this approach may temporarily alleviate the problem, it introduces code redundancy and can obscure the readability of your program. Fortunately, there exists a more elegant solution to this case-sensitive dilemma.

After delving into the official documentation of the json package, you discover the following passage:

"To unmarshal JSON into a struct, Unmarshal matches incoming object keys to the keys used by Marshal (either the struct field name or its tag), preferring an exact match but also accepting a case-insensitive match."

This revelation confirms the fact that json.Unmarshal inherently accepts both types of matches and lacks a mechanism to disable case-insensitive behavior.

To summarize, the standard json library in Go does not currently support case-sensitive JSON unmarshaling. If confronted with this requirement, you must resort to alternative methods or implement your own custom solutions.

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