Mastering Go - Second Edition

Reading JSON data

In this section, you will learn how to read a JSON record from disk using the code of readJSON.go, which will be presented in three parts.

The first part of readJSON.go is shown in the following Go code:

package main 
 
import ( 
    "encoding/json" 
    "fmt" 
    "os" 
) 
 
type Record struct { 
    Name    string 
    Surname string 
    Tel     []Telephone 
} 
 
type Telephone struct { 
    Mobile bool 
    Number string 
} 

In this Go code, we define the structure variables that are going to keep the JSON data.

The second part of readJSON.go is as follows:

func loadFromJSON(filename string, key interface{}) error { in, err := os.Open(filename) if err != nil { return err } decodeJSON := json.NewDecoder(in) err = decodeJSON.Decode(key) if err != nil { return err } in.Close() ...