ViaCep ZipCode Finder, only Brazil. https://viacep.com.br/
It´s a easy way to find zip codes from Brazil. Just open a index.html in your browser, put a brazilian zip code and find it.
I put all the code in just one file, 'index.html', if you want, you can break the code in other files.
Need a help, send a message. Have a nice day.