Assign variable globally nodejs

Question

I'm trying to assign var globally but getting "undefined". How should I assign a variable in order to get the address outside the jsonReader ?

When I checked log inside jsonReader it works fine but when I'm trying to assign it to a gloabl var it shows undefined.

var myaddress;
jsonReader('./data.json',(error,data)=>{
    if(error){
        console.log(error);
    }else{
        addresses = data.records.map(record => record.data.property_name);
        addresses.forEach(element => {
            myaddress = element;
            console.log(myaddress);
        });
    }
})

doc.render({
    propertyname: myaddress,
    propetytype: "",
    phone: "",
    description: "New Website",
});

data.json:

{
  "name": "test",
  "records": [
    {
      "position": 1,
      "data": {
        "employees": {
          "teams": [],
          "users": []
        },
        "address": "ABC 123 Street"
      }
     },
     {
      "position": 2,
      "data": {
        "employees": {
          "teams": [],
          "users": []
        },
        "address": "DEF 456 Street"
      }
     }
  ]
}