Captain•2y ago

Catch TRPCError, ZoddError on the front-end

i am throwing a TRPCError in a mutation. i dont understand how to catch this error in the OnError method. Please help me with this. i have the following: ServerSide

        throw new TRPCError({
            message: 'Password changed too recently',
            code: 'BAD_REQUEST',
            cause: Error("You can only modify your password once a day", { cause: 'VALIDATION_ERROR' }),
        });

        throw new TRPCError({
            message: 'Password changed too recently',
            code: 'BAD_REQUEST',
            cause: Error("You can only modify your password once a day", { cause: 'VALIDATION_ERROR' }),
        });

ClientSide

  const { code, message, name, cause, stack } = error as TRPCError

            console.log(code, message, name, cause, stack)

  const { code, message, name, cause, stack } = error as TRPCError

            console.log(code, message, name, cause, stack)

everyting is undefined except for message. but i'd like to include ZodError to the cause. doesn't work either. browser console.

9 Replies

Captain•2y ago

const error: TRPCError = {
            name: "TRPCError",
            code: "BAD_REQUEST",
            message: "\"password\" must be at least 4 characters"
        }

        if (error instanceof TRPCError) {
            const httpCode = getHTTPStatusCodeFromError(error);
            console.log(httpCode); // 400
        }

const error: TRPCError = {
            name: "TRPCError",
            code: "BAD_REQUEST",
            message: "\"password\" must be at least 4 characters"
        }

        if (error instanceof TRPCError) {
            const httpCode = getHTTPStatusCodeFromError(error);
            console.log(httpCode); // 400
        }

the console.log inside the if statement doesnt get printed

Alex / KATT 🐱•2y ago

Add the actual zod error as the cause in the trpc error instead Then use error.cause

Captain•2y ago

errors.cause is undefined when on client

Alex / KATT 🐱•2y ago

On the client? If you want to propagate to the client you need error formatting

Alex / KATT 🐱•2y ago

https://trpc.io/docs/error-formatting

Error Formatting | tRPC

The error formatting in your router will be inferred all the way to your client (& React components)

Alex / KATT 🐱•2y ago

And it'll be a TRPCClientError

Captain•2y ago

to want to catch the zod parse error, you actually have to throw a zodError should be included in the docs in my opinion also dont flatten the error when formatting also dont safparse

Alex / KATT 🐱•2y ago

feel free to improve the docs! 🙂 would love some help! none of the people working on trpc does it as a full-time job

mark salsbery•2y ago

Good to know! (The first part I mean, I knew the second part)