Guides Routes

Nested dynamic params

Capture multiple path parameters by stacking bracketed segments and read them via request.path (e.g., routes/user/[id]/posts/[post].ts).

Parameters are URL-decoded. For single-bracket segments like [id] or [post], the param is guaranteed to exist if the route matched, so request.path.get("id") and request.path.get("post") are safe. Use .try(key) only with optional segments like [[name]].

1) Define nested params in the filesystem

Create a route with multiple bracketed segments and read each one from request.path.get(...).

TypeScriptroutes/user/[id]/posts/[post].ts

import route from "primate/route";

route.get(request => {
  const id = request.path.get("id");
  const post = request.path.get("post");
  return `user ${id}, post ${post}`;
});

2) Validate or coerce as needed

Coerce string params into the types you need and return a 4xx response when validation fails (e.g., ensure id is a number).

TypeScriptroutes/user/[id]/posts/[post].ts

import route from "primate/route";

route.get(request => {
  const id = Number(request.path.get("id"));
  if (Number.isNaN(id)) return new Response("Invalid id", { status: 400 });
  return { id, post: request.path.get("post") };
});