How to convert a Struct to a JSON in Golang

In this tutorial, you will learn to convert a Golang struct data type to a JSON string using package json by importing encoding/json

import "encoding/json"

To convert a struct data type to a JSON string we use the Marshal function

Example

package main

import (
    "encoding/json"
    "fmt"
)

type Post struct {
    ID      uint     `json:"id"`
    Title   string   `json:"title"`
    Author  string   `json:"author"`
    Content string   `json:"content"`
}

func main () {
    // create an instance of Post struct
    post := Post{
        ID: 1,
        Title: "Golang Tutorial",
        Content: "Learn Golang by examples",
        Author: "Suraj Sharma",
    }

    // use json.Marshal to convert the post to a []byte of JSON data
    b, err := json.Marshal(post)

    if err != nil {
        fmt.Println("Unable to convert the struct to a JSON string")
    } else {
        // convert []byte to a string type and then print
        fmt.Println(string(b))
    }
}

// output
// {"id":1,"title":"Golang Tutorial","author":"Suraj Sharma","content":"Learn Golang by examples"}

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