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

I use React and Rails. I did:

js

  let params = {
    filter_array: ['A', 'B', 'C']
  }

  ...

  //transform params in URI

  Object.keys(params).map(key => {
    if (Array.isArray(params[key])) {
      return params[key].map((value) => `${key}[]=${value}`).join('&')
    }
  }
  //filter_array[]=A&filter_array[]=B&filter_array[]=C