refresh_token.js

function apiReq(url) {
    getToken()
    .then(function(token) {
        axios.get(url, {headers: {'Authorization' : 'Bearer ' + token}})
        .then(function(response) {
            alert(response.data);
        });
    })
}

function getToken() {
    return new Promise(function(resolve, reject) {
        keycloak.updateToken(5)
        .then(function() {
            resolve(keycloak.token);
        })
        .catch(function() {
            alert('Failed to refresh token');
        })
    });
}