Как конвертировать struct to json golang

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type Employee struct {
    Name string `json:"empname"`
    Number int  `json:"empid"`
}

 emp := &Employee{Name: "Rocky",Number: 5454}
 e, err := json.Marshal(emp)
 if err != nil {
    fmt.Println(err)
    return
 }
 fmt.Println(string(e))

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package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
)

type Rankings struct {
    Keyword  string 
    GetCount uint32 
    Engine   string 
    Locale   string 
    Mobile   bool   
}

func main() {
    var jsonBlob = []byte(`
        {"keyword":"hipaa compliance form", "get_count":157, "engine":"google", "locale":"en-us", "mobile":false}
    `)
    rankings := Rankings{}
    err := json.Unmarshal(jsonBlob, &rankings)
    if err != nil {
        // nozzle.printError("opening config file", err.Error())
    }

    rankingsJson, _ := json.Marshal(rankings)
    err = ioutil.WriteFile("output.json", rankingsJson, 0644)
    fmt.Printf("%+v", rankings)
}