Why Is My Go Struct Not Populating Correctly When Parsing JSON?

Parsing JSON into Go Structs: Uncovering the Issue

In an attempt to configure a Go program using JSON, you encountered a roadblock where the parsed struct was not populating correctly. Let's delve into the details of this issue and provide a solution.

The provided code aims to parse a JSON file into a struct, but upon execution, it prints incorrect values. The root cause lies in the struct definition itself. In Go, struct fields must be exported to be accessible to the JSON encoder and decoder. This means that the field names must start with uppercase letters.

Here's how to resolve the issue:

type Settings struct {
    ServerMode bool `json:"serverMode"`
    SourceDir  string `json:"sourceDir"`
    TargetDir  string `json:"targetDir"`
}

Notice that the field names (ServerMode, SourceDir, TargetDir) now start with uppercase letters.

The modified code will successfully parse the JSON file and populate the struct with the correct values.

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