How do I use JSON tags in Go structs?

How do I use JSON tags in Go structs?

In Go, you can use struct tags to specify how fields should be encoded to and decoded from JSON. For example:

type Person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

This will map the Name field to the JSON key name and the Age field to age.

Can I customize the JSON key names?

Yes, you can customize the JSON key names by changing the string in the backticks. For instance, if you want the key to be full_name, you would write:

Name string `json:"full_name"`

What if I want to omit a field from the JSON output?

You can omit a field by using the json:"-" tag. For example:

Age int `json:"-"`

This will prevent the Age field from being included in the JSON output.

Are there any default values for JSON tags?

No, JSON tags do not have default values. If a field is not present in the JSON, the zero value for that type will be used when decoding.