How to decode this json in Firebase realtime Database? - firebase

Question

void readData() {
databaseReference
.child("data")
.child("chapters")
.once()
.then((DataSnapshot snapshot) {
print('Data : ${snapshot.value}');
});
This is my read data function and I got the following JSON output.
[
{
"name": "Global Village",
"videolists": [
{
"title": "Binary to decimal",
"link": "http://..........",
"duration": "5:3"
},
{
"title": "Binary to decimal",
"link": "http://..........",
"duration": "5:3"
}
]
},
{
"name": "Data Communication and Networking",
"videolists": [
{
"title": "Binary to decimal",
"link": "http://..........",
"duration": "5:3"
},
{
"title": "Binary to decimal",
"link": "http://..........",
"duration": "5:3"
}
]
}
]
I have tried to decode the JSON using this code
var lists= json.decode(snapshot.value) as List<dynamic>;
But I got an error like this
Unhandled Exception: type 'List' is not a subtype of type
'String'
How can I decode the JSON?

Answer 1

You can try the following:
Iterable lists = json.decode(result);
List<dynamic> map = lists.toList();
map.forEach((res){
print(res["videolists"][0]);
});
json.decode() takes a String and returns a dynamic, therefore we can assign it to class Iterable and then we can use toList() to create a list and iterate using forEach(). The above should give you:
{title: Binary to decimal, link: http://.........., duration: 5:3}
{title: Binary to decimal, link: http://.........., duration: 5:3}