How check if a substring is contained in another string in JavaScript

It's possibile use the function "indexOf" that returns the position of the string in the another string. If not found, it will return -1:
For example:
var s = "stringa";
alert(s.indexOf("ng") > -1);

Other way, it could be used jQuery's :contains selector.

Last way is the method String.includes():
For example:
var str = 'To be, or not to be, that is the question.';
console.log(str.includes('To be'));       // true
console.log(str.includes('question'));    // true
console.log(str.includes('nonexistent')); // false
console.log(str.includes('To be', 1));    // false
console.log(str.includes('TO BE'));       // false

Bye

The correct JSON content type

The MIME media type for JSON text is application/json. The default encoding is UTF-8.

Resources:

• Media Types
• RFC4627.txt
• bluesmoon: JSON has a type

Bye

Redirect a page with JavaScript

If you want to simulate someone clicking on a link, use location.href.
If you want to simulate an HTTP redirect, use location.replace.

For example:
// similar behavior as an HTTP redirect
window.location.replace("http://newpage.com");
// similar behavior as clicking on a link
window.location.href = "http://newpage.com";

Bye