Encode / Decode JSON in Go

2014-12-06 ·

json package allows to easily implement encoding and decoding of JSON in Go langauge.

Let's start with a Go struct

type Config struct {
    RepoName string   `json:"repository_name"`
    Domains  []string `json:"domains"`
    Env      string   `json:"env"`
}

Create an instance of Config

config := Config{"foo",
    []string{"bar.com", "baz.com"},
    "FOO=l\nBAR=69"}

Finally, marshal config instance using json.Marshal function.

r, err := json.Marshal(config)

The result is a []byte, let's display it

fmt.Println(string(r))

Decoding is similar, but it uses json.Unmarshal function. Create another Config variable which will be used to store the result of decoding.

var c2 Config
err := json.Unmarshal(r, &c2)

For a more in depth introduction to the subject check JSON and Go article.

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