Simply path/URL building in JavaScript. Intelligently handles URL params and query strings.

This library owes thanks to urlcat, but unfortunately it seems to be abandoned. You can mostly use pathcat as a replacement.

• Very intuitive API
• Supports URL params and query string
• Avoids double slashes

yarn add pathcat

import { pathcat } from "pathcat";

pathcat("https://example.com", "/:id", {
	id: 123,
});
// => 'https://example.com/123'

pathcat("https://example.com", "/:id", {
	id: "123",
	foo: "bar",
});
// => 'https://example.com/123?foo=bar'

// Base URL is optional, works on just paths as well.
pathcat("/users/:user_id/posts/:post_id", {
	user_id: "123",
	post_id: 456,
	cool_flag: true,
});
// => '/users/123/posts/456?cool_flag=true'

Results when running bun run benchmark.ts on an M3 Max

pathcat x 1,132,795 ops/sec ±0.74% (95 runs sampled)

• Any params or query string values that are undefined will be omitted.
• Params that were not specified in the object will be left as is.