JavaScript Snippet

Read a URL Query Parameter

Difficulty: Easy

Reading `?q=hello` is a one-liner with `URLSearchParams`, but the helpers around it (multi-value params, defaults, type coercion, updating without reload) are where most apps end up duplicating code. This snippet covers the basic read, a typed-default helper, and a setter that updates the URL with `history.replaceState` so the back button keeps working. Use it for filters, search inputs, and shareable links.