Golang iterate/parse generic JSON array

parse_generic_json_array.go

// https://play.golang.org/p/ZC2RkvU5XtN
package main

import "fmt"
import "encoding/json"

func main() {

	payload := []byte(`[{"Key":"[email protected]:PROGRESS_UPDATE:UPD-000001", "Record":{"contractId":"UPD-000001","type":3,"status":0,"createDate":"2019-03-15T12:07:48+07:00","content":"mock content","groupOfSignatures":[{"participantId":"[email protected]","signature":"alice's signature"},{"participantId":"[email protected]","signature":""}],"message":"progress update for Inv 01","generalReferences":["n/a"],"pendingBy":"","referenceToContractId":""}},{"Key":"[email protected]:PROGRESS_UPDATE:UPD-000010", "Record":{"contractId":"UPD-000010","type":3,"status":4,"createDate":"2019-03-15T12:07:48+07:00","content":"mock content","groupOfSignatures":[{"participantId":"[email protected]","signature":"alice's signature"},{"participantId":"[email protected]","signature":""}],"message":"progress update for Inv 01","generalReferences":["n/a"],"pendingBy":"","referenceToContractId":""}},{"Key":"[email protected]:PROGRESS_UPDATE:UPD-000020", "Record":{"contractId":"UPD-000020","type":3,"status":2,"createDate":"2019-03-15T12:07:48+07:00","content":"mock content","groupOfSignatures":[{"participantId":"[email protected]","signature":"alice's signature"},{"participantId":"[email protected]","signature":"bob's signature"}],"message":"progress update for Inv 01","generalReferences":["n/a"],"pendingBy":"","referenceToContractId":""}},{"Key":"[email protected]:TRADE:INV-000001", "Record":{"contractId":"INV-000001","type":0,"status":0,"createDate":"2019-03-15T12:07:48+07:00","content":"IPFS Invoice 01","groupOfSignatures":[{"participantId":"[email protected]","signature":"alice's signature"},{"participantId":"[email protected]","signature":""}],"message":"Invoice 01","generalReferences":["n/a"],"pendingBy":"","progressReferences":null,"cancelReferences":null,"sideLetterReferences":null}},{"Key":"[email protected]:TRADE:INV-000080", "Record":{"contractId":"INV-000080","type":0,"status":2,"createDate":"2019-03-15T12:07:48+07:00","content":"IPFS Invoice 01","groupOfSignatures":[{"participantId":"[email protected]","signature":"alice's signature"},{"participantId":"[email protected]","signature":"bob's signature"}],"message":"Invoice 01","generalReferences":["n/a"],"pendingBy":"","progressReferences":null,"cancelReferences":null,"sideLetterReferences":null}},{"Key":"[email protected]:TRADE:INV-000099", "Record":{"contractId":"INV-000099","type":0,"status":3,"createDate":"2019-03-15T12:07:48+07:00","content":"IPFS Invoice 01","groupOfSignatures":[{"participantId":"[email protected]","signature":"alice's signature"},{"participantId":"[email protected]","signature":""}],"message":"Invoice 01","generalReferences":["n/a"],"pendingBy":"","progressReferences":null,"cancelReferences":null,"sideLetterReferences":null}}]`)

	var v interface{}

	json.Unmarshal(payload, &v)
	data := v.([]interface{})

	for k, v := range data {
		switch v := v.(type) {
		case string:
			fmt.Println(k, v, "(string)")
		case float64:
			fmt.Println(k, v, "(float64)")
		case []interface{}:
			fmt.Println(k, "(array):")
			for i, u := range v {
				fmt.Println("   ", i, u)
			}
		case map[string]interface{}:
			fmt.Println(k, "(map array):")
			for i, u := range v {
				fmt.Println("    ", i, u)
			}
		default:
			fmt.Println(k, v, "(unknown)")
		}
	}
}