How Can I Generate Human-Readable JSON Output in Go?

Human-Readable JSON Output in Go

In Go, it's possible to generate human-readable JSON output without the need for an external jq wrapper. The encoding/json package provides built-in functions for prettifying JSON output.

Using json.MarshalIndent() or json.Encoder.SetIndent()

The json.MarshalIndent() function formats a Go value as a JSON string and indents it according to the specified prefix and indent characters.

For example, to format a map as JSON:

m := map[string]interface{}{"id": "uuid1", "name": "John Smith"}

data, err := json.MarshalIndent(m, "", "  ")
if err != nil {
    panic(err)
}
fmt.Println(string(data))

Output:

{
  "id": "uuid1",
  "name": "John Smith"
}

You can also use the json.Encoder.SetIndent() method to indent the output from an encoder.

Using json.Indent()

If you have a JSON string that you want to format, you can use the json.Indent() function:

src := `{"id":"uuid1","name":"John Smith"}`

dst := &bytes.Buffer{}
if err := json.Indent(dst, []byte(src), "", "  "); err != nil {
    panic(err)
}
fmt.Println(dst.String())

Output:

{
  "id": "uuid1",
  "name": "John Smith"
}

Customizing Indentation

The indent characters can be customized based on your preference. By default, the prefix is an empty string, and the indent is a single space. You can override these defaults to create a JSON output with the desired indentation style.

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