Using Promise and checking if the body object is a valid JSON. If not a Promise reject will be returned.
var DoPost = function(url, body) {
try {
body = JSON.stringify(body);
} catch (error) {
return reject(error);
}
return new Promise((resolve, reject) => {
$.ajax({
type: 'POST',
url: url,
data: body,
contentType: "application/json",
dataType: 'json'
})
.done(function(data) {
return resolve(data);
})
.fail(function(error) {
console.error(error);
return reject(error);
})
.always(function() {
// called after done or fail
});
});
}