useQueryParams

A hook for reading and updating the query string parameters on the page. Updates on all URL changes. Returns an array that, much like React’s own useState, has a value and a setter function. The value is a parsed querystring object, and the setter takes an object that it will serialize into the query string.

API

export function useQueryParams(
  parseFn?: (query: string) => QueryParam,
  serializeFn?: (query: QueryParam) => string
): [QueryParam, (query: QueryParam, replace?: boolean) => void]

Basic

The default parse and serialize functions utilize the browser’s built-in URLSearchParams. You can provide custom parse and serialize functions to override this behavior.

import { useQueryParams } from 'raviger'

function UserList ({ users }) {
  const [{ startsWith }, setQuery] = useQueryParams()

  return (
    <div>
    <label>
      Filter by Name
      <input value={startsWith || ''} onChange={(e) => setQuery({ startsWith: e.target.value})} />
    </label>
    {users.filter(u => !startsWith || u.name.startsWith(startsWith).map(user => (
      <p key={user.name}>{user.name}</p>
    )))}
    </div>
  )
}

Updating the Query with merge

The second return value from useQueryParams is a function that updates the query string. By default it overwrites the entire query, but it can merge with the query object by setting the second param to { replace: false }.

import { useQueryParams } from 'raviger'

function UserList ({ users }) {
  const [{ startsWith }, setQuery] = useQueryParams()
  return (
    <input value={startsWith || ''} onChange={(e) => setQuery({ startsWith: e.target.value}, { replace: false })} />
  )
}

The replace: false setting also preserves the location.hash. The intent should be thought of as updating only the part of the URL that the setQuery object describes.

Warning: using setQuery inside of a useEffect (or other on-mount/on-update lifecycle methods) can result in unwanted navigations, which show up as duplicate entries in the browser history stack.

Custom serialization and parsing

Its possible to override either the querystring serializer, deserializer, or both, by providing functions to useQueryParams. Use a custom wrapper hook to reuse throughout your application.

import { useQueryParams } from 'raviger'
import qs from 'qs'

export function useCustomQuery() {
  return useQueryParams(qs.parse, qs.stringify)
}