https://stackoverflow.com/questions/58166593/how-to-parse-json-in-flutter-with-arrays-of-arrays

main.dart

import 'dart:convert';

void main() {
  String jsonString = ''' 
    {
      ModuleEId: [
        [
          "Test Equipment - R&D",
          "GPU_0001_180 KVA Dual AC 28.5V DC"
        ],
        [
          "Test Equipment - Electronics",
          "GPU_0004_180 KVA Dual AC 28.5 V DC"
        ]
      ]
    }
    ''';

  // fix json format
  jsonString = jsonString.replaceAll('ModuleEId', '"ModuleEId"');

  // parse json
  final parsed = json.decode(jsonString);

  print("Parsed: $parsed \n");

  // iterate through array and print elements
  for (final a in parsed['ModuleEId']) {
    for (final b in a) {
      print(b);
    }
  }
}