func NewDecoder(r io.Reader) *Decoder is a function defined in the encoding/json package which reads a JSON input stream, stores it in the buffer of a Decoder object, and returns the Decoder object. The Decoder object can then be used to perform methods such as Decode(), More(), InputOutputOffset(), Buffered().
r: JSON readable stream that implements a io.Reader interface
*Decoder: Object of the type Decoder defined in the encoding/json package
package mainimport ("encoding/json""fmt""strings")func main() {const jsonStream = `{"Name": "Hassan", "Major": "Physics", "RollNumber": 18100026}`type Student struct {Name, Major stringRollNumber int32}dec := json.NewDecoder(strings.NewReader(jsonStream))var stu Student_ = dec.Decode(&stu)fmt.Printf("Student Information\nName: %s\t Major: %s\t RollNumber: %d\n", stu.Name, stu.Major, stu.RollNumber)}
In the above example, we define a struct Student with properties Name, Major, and RollNumber. We define jsonStream with a JSON object and pass it to the strings.NewReader() method to make a readable JSON stream. We pass the JSON stream to the func NewDecoder(r io.Reader) *Decoder which returns a Decoder object which is assigned to dec. We use the Decode() method accessible to dec which decodes the JSON object into the properties of Student and store in the stu object.
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