How to pass an array within a query string?

Question

Is there a standard way of passing an array through a query string?

To be clear, I have a query string with multiple values, one of which would be an array value.

Answer 1

Although there isn't a standard on the URL part, there is one standard for JavaScript. If you pass objects containing arrays to URLSearchParams, and call toString() on it, it will transform it into a comma separated list of items:

let data = {
  str: 'abc',
  arr: ['abc', 123]
}

new URLSearchParams(data).toString();  // ?str=abc&arr=abc,123