Format JSON with indentation in Go

Question

After I do

    json, err := json.Marshal(buf)

I get something like:

{"a":123,"b":"abc"}

But what I want is an indented version of this:

{
    "a": 123,
    "b": "abc"
}

How?

Answer 1

Use json.MarshalIndent(group, "", "\t"), try this:

package main

import (
    "encoding/json"
    "fmt"
    "os"
)

func main() {
    type ColorGroup struct {
        ID     int
        Name   string
        Colors []string
    }
    group := ColorGroup{
        ID:     1,
        Name:   "Reds",
        Colors: []string{"Crimson", "Red", "Ruby", "Maroon"},
    }
    b, err := json.MarshalIndent(group, "", "\t")
    if err != nil {
        fmt.Println("error:", err)
    }
    os.Stdout.Write(b)
}

output:

{
    "ID": 1,
    "Name": "Reds",
    "Colors": [
        "Crimson",
        "Red",
        "Ruby",
        "Maroon"
    ]
}