Endpoint maps over hand-rolled methods

Tue, 25 Aug 2026 00:00:00 +0000

I’ve now written two client libraries for the same exchange API — one in Go , one in Java — and the thing I’d keep from both is the same: don’t write a method per endpoint. Describe the endpoints as data and dispatch through one function.

The shape of the problem

The API has roughly two dozen endpoints. They differ in four ways:

HTTP verb (GET, POST, DELETE)
path
whether the request must be signed
the response body

Everything else — building query params, adding a signature, choosing the verb handler, parsing the response — is identical. Writing a hand-rolled method per endpoint means writing that identical body 25 times, and then maintaining 25 copies of it when the signing scheme or the base URL handling changes.

API on Prateek Sharma

Endpoint maps over hand-rolled methods

The shape of the problem