Autofill City and State based on zip code input using ziptastic API

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Hello guys! I’m new here, I have followed every single detail from this tutorial , and it is not working, so I need to autofill City and State fields based on zip code input, please help me.
This is my code, When I Typing the zip code, absolutely nothing happens, maybe something is missing in the onReady function?

Any suggestion is really appreciated.

.

$w.onReady(function () {
 // Write your JavaScript here
}

export function zipcode_keyPress(event, $w) {
 // This function was added from the Properties & Events panel. To learn more, visit http://wix.to/UcBnC-4
 // Add your code for this event here: 

 //cuando el usurio escriba e un campo este codigo se ejecutara
 let zipcode = $w("#zipcode").value;
 let apiURL = "http://ZiptasticAPI. com/";

 if (zipcode.lenght === 5) { 

    fetch(apiURL + zipcode, {nethod: "get"})
      .then( (httpResponse) => {
 if (httpResponse.ok) {
    return httpResponse.jason();
      }
 else{
     return Promise.reject("El codigo postal no fue encontrado");
      }
     }  )
     .then ( (json) => {
         console.log(JSON.stringify(json));
         $w("#city").value = json.city;
         $w("#state").value=json.state;
    } )
    .catch ( (err) => {
    console.log(err);
    } );
    }

}