How Can I Unmarshal JSON with Spaces in Key Names Using Go's `encoding/json`?

JSON Key Names with Spaces: Unmarshalling Made Possible

Deserializing JSON data with complex keys that contain spaces can often pose challenges during unmarshalling. Let's investigate a specific example using the encoding/json library in Go.

Problem:

Consider the following JSON schema:

[
  {"Na me": "Platypus", "Order": "Monotremata"},
  {"Na me": "Quoll", "Order": "Dasyuromorphia"}
]

Using the standard encoding/json library to unmarshal this data into the following Go struct:

type Animal struct {
    Name  string `json:"Na me"`
    Order string `json:"Order,omitempty"`
}

results in an empty "Name" field due to the space in the JSON key.

Cause:

The space in the JSON key confuses the unmarshalling process. The library tries to match the key "Na me" with a field in the Animal struct, but there is no corresponding field.

Solution:

To resolve this issue, ensure that the struct field tags in the json tag specify the correct key names, including the spaces:

type Animal struct {
    Name  string `json:"Na me"`
    Order string `json:"Order,omitempty"`
}

With this revised tagging, the unmarshalling process can successfully map the JSON keys to the correct struct fields, resulting in the expected output:

[
  {Name:Platypus Order:Monotremata}
  {Name:Quoll Order:Dasyuromorphia}
]

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