How to Convert JSON to Struct in Golang

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To convert a JSON string (or a byte slice containing JSON) to a Go struct, you can “use the json.Unmarshal() function from the encoding/json package.”

Go JSON to Struct

Here is the step-by-step guide to convert JSON to Struct in Go:

  1. Define the struct that matches the expected structure of the JSON data.
  2. Convert the JSON string to a byte slice (if it’s not already in that form).
  3. Use json.Unmarshal() function to decode the JSON into the struct.

Example

package main

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

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

func main() {
  jsonData := []byte(`{"name":"Krunal Lathiya","age":30}`)

  var person Person

  err := json.Unmarshal(jsonData, &person)
  if err != nil {
    log.Fatal(err)
  }

  fmt.Printf("Name: %s, Age: %d\n", person.Name, person.Age)
}

Output

Name: Krunal Lathiya, Age: 30

That’s it!

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