Server Actions & the Client Boundary

in/server-actions 2K members

server action returns a prisma row and next throws "only plain objects can be passed" Serialization

Next 15.4, app router. The action is four lines: A client component calls it inside a transition and I get It names the field. If I log the object on the server it looks completely ordinary. What is it actually…

9 answers Share

@pentalobe_junie · 6d ago

form fires my server action twice on slow connections and useFormStatus stays false Mutations

with a submit button that also has an onClick wrapping the same action in . On wifi you never see it. On a throttled 3G profile I get two order rows about 40% of the time. And returns for the whole submit, so the…

7 answers Share

132

@peer_review_pat · 2w ago

"failed to find server action" errors for 20 minutes after every deploy Solved

Every deploy produces a Sentry spike: Between 30 and 60 of them, then it stops on its own. It is an internal dashboard so people leave a tab open from 09:00 and click save at 15:00. Nothing in our code changed between…

9 answers Share

@newborn_noob · 3w ago

is it normal that server actions post to the page url instead of an api route Mutations

Coming from express, so I expected to see POST /api/something. Devtools shows POST /dashboard with a header, and the response body is a stream of numbered lines rather than JSON. Nothing in my code mentions /dashboard…

6 answers Share

@dockerfile_yuki · last mo.

server action or route handler for 12mb video uploads, two devs and a month Mutations

Users upload short screen recordings, typically 8 14 MB. Sending the File in FormData to a server action 413s at about a megabyte. I can raise but I am nervous about pushing 12 MB through a serverless function that also…

8 answers Share

@dax_darian · 3mo ago

zod in the action or react-hook-form on the client, solo and launching in two weeks Validation

Six forms, the biggest has nine fields. I keep starting react hook form + a resolver, then remembering the action has to validate anyway, then wondering why I'm writing it twice. Two weeks until I need this in front of…

8 answers Share

For people wiring up Server Actions, forms, and React Server Components who hit serialization errors, double submits, or confusion about where `use client` should sit.

What belongs here

"use server" functions and the code that calls them: useActionState, useFormStatus, progressive enhancement without JavaScript, optimistic updates and rollback, passing values across the server/client boundary, "Only plain objects can be passed to Client Components", auth and rate-limit checks inside an action, Zod validation of FormData, and what to redirect or revalidate after a mutation succeeds.

What gets removed

Self-promotion of any shape, including "I built a form library, thoughts?". Also removed: vague "is this the right architecture" posts with no code, and reposts of the same question across three rooms.

How to ask well

Paste the action and the component that calls it, side by side. Add the framework and React version, the full error including the component stack, and whether it fails on first submit, on repeat submits, or only for logged-out users. A twenty-line reproduction gets answered; a paragraph describing one rarely does.

2K members
6 posts

Created April 18, 2025

Ask in this room

1
Show both sides of the boundary

The action alone is half the story; include the client component, its `use client` directive, and how the arguments are constructed.
2
Paste the exact error

Serialization and hydration errors name the offending prop or component, and that name is usually the whole answer.
3
Treat auth as part of the question

Actions are public endpoints, so tell us how the action checks the session before anyone can help you make it safe.
4
No promotion, no launches

Sharing your repo is fine when it answers someone's question. Posting it as its own thread is not.