Why Isn\'t My Go HTTP Server Returning JSON Data?

Making HTTP Responses with JSON

In this question, the author encountered difficulties in producing JSON responses from their Go HTTP server. Upon comparison with a working sample, they were stumped by the apparent similarities in their code.

The crux of the issue lies in the difference between public and unexported variables in Go structs. The working sample utilized public (exported) field names, such as:

type Profile struct {
  Name    string
  Hobbies []string
}

In contrast, the author's struct featured unexported (lowercase) field names:

type ResponseCommands struct {
    key   string
    value bool
}

When marshaling unexported fields to JSON, the encoder will ignore them. Consequently, the author's custom JSON response contained no data. To resolve this, they should ensure that their struct field names are exported (capitalized) to ensure proper JSON representation.

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