JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [{
    "update_data": {
      '1': {
        "active_value": '1e+31',
        "is_active": false
      },
      '2': {
        "active_value": '5',
        "is_active": false
      }
    }
  }
]

// example direct
console.log( data[0].update_data[1].active_value );

// example "digging"
console.log(data);
data = data[0];
console.log(data);
data = data.update_data;
console.log(data);
data = data[1];
console.log(data);
data = data.active_value;
console.log( data );