Helper functions to work with query params on the URL

query-params.ts

import { ParsedUrlQuery } from 'querystring'

export function parsedUrlQueryToURLSearchParams(
  query: ParsedUrlQuery
): URLSearchParams {
  const searchParams = new URLSearchParams()
  for (const [key, value] of Object.entries(query)) {
    if (!value) continue
    if (Array.isArray(value)) {
      value.forEach((element) => {
        searchParams.append(key, element)
      })
    } else {
      searchParams.append(key, value)
    }
  }
  return searchParams
}
export function urlSearchParamsToParsedUrlQuery(
  searchParams: URLSearchParams
): ParsedUrlQuery {
  const query: ParsedUrlQuery = {}
  for (var [key, value] of searchParams.entries()) {
    query[key] = value
  }
  return query
}

export function parsedUrlQueryToURLString(query: ParsedUrlQuery): string {
  const params = []
  for (const [key, value] of Object.entries(query)) {
    if (!value) continue
    if (Array.isArray(value)) {
      value.forEach((element) => {
        params.push(`${key}=${element}`)
      })
    } else {
      params.push(`${key}=${value}`)
    }
  }
  return params.join('&')
}