Function ExampleDecoder_Decode_stream

json/golang_example_test.go:124–173

This example uses a Decoder to decode a streaming array of JSON objects.

()

// This example uses a Decoder to decode a streaming array of JSON objects.
func ExampleDecoder_Decode_stream() {
	const jsonStream = `
	[
		{"Name": "Ed", "Text": "Knock knock."},
		{"Name": "Sam", "Text": "Who's there?"},
		{"Name": "Ed", "Text": "Go fmt."},
		{"Name": "Sam", "Text": "Go fmt who?"},
		{"Name": "Ed", "Text": "Go fmt yourself!"}
	]
`
	type Message struct {
		Name, Text string
	}
	dec := json.NewDecoder(strings.NewReader(jsonStream))

	// read open bracket
	t, err := dec.Token()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%T: %v\n", t, t)

	// while the array contains values
	for dec.More() {
		var m Message
		// decode an array value (Message)
		err := dec.Decode(&m)
		if err != nil {
			log.Fatal(err)
		}

		fmt.Printf("%v: %v\n", m.Name, m.Text)
	}

	// read closing bracket
	t, err = dec.Token()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%T: %v\n", t, t)

	// Output:
	// json.Delim: [
	// Ed: Knock knock.
	// Sam: Who's there?
	// Ed: Go fmt.
	// Sam: Go fmt who?
	// Ed: Go fmt yourself!
	// json.Delim: ]
}

// This example uses RawMessage to delay parsing part of a JSON message.
func ExampleRawMessage_unmarshal() {