Go Systems Programming

Parsing JSON data

This subsection will illustrate how to read a JSON record and convert it into one Go variable that you can use in your own programs. The name of the presented program will be readJSON.go and will be shown to you in four parts.

The first part of the utility is identical to the first part of the writeJSON.go utility:

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

The second part of the Go code is the following:

funcloadFromJSON(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 ...