Understanding fetch and promises

fetch.js

fetch('http://httpbin.org/get?name=name&password=passwd')
    .then(response => response.json())
    .then(
        data => console.log(`User - ${data.args.name}`), 
        error => console.log(error.message)
    );

fetch('http://httpbin.org/status/401')
    .then(response => response.json())
    .then(
        data => console.log(`User -> ${data.args.name}`), 
        error => console.log(error.message)
    );