How can I validate a ZIP code and fill in a field, for example city, using jquery validate?
For example: the field (input) that the user would fill the city would be disabled and the value of the same would be taken by a validation of the CEP, I found this free service which returns a JSON output on the zip code information.
To validate you can use a regex .
^\d{5}-\d{3}$
And to fill in the fields you can use code in this style.
var json={
"cep": "01001-000",
"logradouro": "Praça da Sé",
"complemento": "lado ímpar",
"bairro": "Sé",
"localidade": "São Paulo",
"uf": "SP",
"unidade": "",
"ibge": "3550308",
"gia": "1004"
};
for(key in json)
{
if(json.hasOwnProperty(key))
$('input[name='+key+']').val(json[key]);
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><form><inputtype="text" name="cep"/>
<input type="text" name="logradouro"/>
<input type="text" name="bairro"/>
<input type="text" name="localidade"/>
<input type="text" name="uf"/>
</form>