Example
JSON data can also be read from files.
Let's assume we have a file called data.json with the following content:
[
{
"Name" : "John Doe",
"Standard" : 4
},
{
"Name" : "Peter Parker",
"Standard" : 11
},
{
"Name" : "Bilbo Baggins",
"Standard" : 150
}
]
The following example reads the file and decodes the content:
package main
import (
"encoding/json"
"fmt"
"log"
"os"
)
type Student struct {
Name string
Standard int `json:"Standard"`
}
func main() {
// open the file pointer
studentFile, err := os.Open("data.json")
if err != nil {
log.Fatal(err)
}
defer studentFile.Close()
// create a new decoder
var studentDecoder *json.Decoder = json.NewDecoder(studentFile)
if err != nil {
log.Fatal(err)
}
// initialize the storage for the decoded data
var studentList []Student
// decode the data
err = studentDecoder.Decode(&studentList)
if err != nil {
log.Fatal(err)
}
for i, student := range studentList {
fmt.Println("Student", i+1)
fmt.Println("Student name:", student.Name)
fmt.Println("Student standard:", student.Standard)
}
}
The file data.json must be in the same directory of the Go executable program. Read Go File I/O documentation for more information on how to work with files in Go.
