How to convert to JSON Format Realtime Database Flutter

Question

I managed to get one data from Firebase Realtime Database. This time I want to turn it into JSON format and get two data at least. Below is the code

my Database Reference `

DatabaseReference ref =
        FirebaseDatabase.instance.ref().child('UsersData/$userDataUID/test/int');

my code `

StreamBuilder(
              stream: ref.onValue,
              builder: (context, snapshot) {
                if (snapshot.hasData) {
                  debugPrint(snapshot.data?.snapshot.value.toString());   
                }
                return const CircularProgressIndicator();
              })),

my Firebase console

I believe I have to convert it into Maps? I have no idea how to begin with

you can get the map with child('UsersData/$userDataUID/test') — Md. Yeasin Sheikh
– Md. Yeasin Sheikh, Commented Nov 14, 2022 at 17:54

Md. Yeasin Sheikh · Accepted Answer · 2022-11-14 18:57:42Z

1

Try with

DatabaseReference ref =
        FirebaseDatabase.instance.ref().child('UsersData/$userDataUID/test');

This will return a map with those fields.

And use on widget like

 if (snapshot.hasData) {
     final map =  snapshot.data?.snapshot.value as Map?;
     return Text("int: ${map?["int"]}  voltage: ${map?["voltage"]}"); }

Find more about getting data

edited Nov 14, 2022 at 18:57

answered Nov 14, 2022 at 17:59

Md. Yeasin Sheikh

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8 Comments

Harris Shah Over a year ago

I tried your method but it shows the error on map?["int"] that says 'The operator '[]' isn't defined for the type 'DatabaseEvent'. Try defining the operator '[]'.'

Md. Yeasin Sheikh Over a year ago

try snapshot.data as Map?;

Harris Shah Over a year ago

new error : type 'DatabaseEvent' is not a subtype of type 'Map<dynamic, dynamic>?' in type cast

Md. Yeasin Sheikh Over a year ago

oh it should be snapshot.data?.snapshot.value as Map? i think

Harris Shah Over a year ago

it works now after I put ''' snapshot.data?.snapshot.value as Map? '''. Thank you very much!

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