Building an API across multiple workers

Looking at building a large API with Cloudflare workers with about 60 endpoints. It would be crazy to build all in one worker, right?

I considered using Hono and npmn workspaces to share code between workers where needed. Has anyone done this before? Looking at most guides everyone has a worker with four endpoints.

Last thought has does it work mapping a domain say api.example.com to multiple workers?

kian•10/13/23, 1:49 AM

It's all personal preference, really. You can split it up into multiple files, multiple Workers, whatever works best for you.

kian•10/13/23, 1:49 AM

Until you're hitting the boundaries of Worker bundle limits (at which point you'll start to hit cold start penalties, or simply hit the limit and you can't publish anymore), there's no right or wrong answer.

kian•10/13/23, 1:50 AM

You can have src/users/index.tssrc/users/index.ts that contains the routes for /users//users/

or you can have a users Worker that is only bound to the route for example.com/users/*example.com/users/*

AlexanderKaranOP•10/13/23, 1:59 AM

I was thinking of splitting each route into its own worker i.e

/users -> all sub routes and actions in one worker
/accounts -> all sub routes and actions in another worker

AlexanderKaranOP•10/13/23, 2:01 AM

I just can't see an API this size fitting all into one worker especialy due to the logic that needs to happen in endpoints (carbon and emission tracking)

AlexanderKaranOP•10/13/23, 2:01 AM

Is there a best practice on sharing code between workers or is all in one repo using pnpm good?

AAlexanderKaran I just can't see an API this size fitting all into one worker especialy due to t...

kian•10/13/23, 2:02 AM

Workers can be pretty big as far as code goes, due to minifying and the limits being on the gzip’d size, but if several Workers is better for you as far as workflow/management then there’s nothing wrong with it.

kian•10/13/23, 2:04 AM

You can easily call Workers with very low overhead using Service Bindings, which is an alternative option to sharing code - but requesting a Worker via Service Bindings will bill you a request like invoking it normally.

kian•10/13/23, 2:04 AM

As for the pnpm side of things, I’ve never had to manage a project that needed splitting so I’ll leave that for someone more experienced with it to comment on.

AlexanderKaranOP•10/13/23, 2:05 AM

What is a workers limit and thank you so much for the advice so far

kian•10/13/23, 2:14 AM

https://developers.cloudflare.com/workers/platform/limits/

Limits · Cloudflare Workers docs

You can request adjustments to limits that conflict with your project goals by contacting Cloudflare. To request an increase to a limit, complete the …

kian•10/13/23, 2:14 AM

Whenever you do development or deployments with Wrangler it’ll tell you the size of your Worker

AlexanderKaranOP•10/13/23, 2:16 AM

Cool

AlexanderKaranOP•10/13/23, 2:16 AM

Yeah going to have to split this up lol

AlexanderKaranOP•10/13/23, 2:16 AM

Thanks Kian

Building an API across multiple workers

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