useMutation()

The hooks provided by @trpc/react are a thin wrapper around React Query. For in-depth information about options and usage patterns, refer to their docs on Mutations.

Works like react-query's mutations - see their docs.

Example

Backend code

server/routers/_app.ts
import * as trpc from '@trpc/server';
import { z } from 'zod';

export const appRouter = trpc.router()
  // Create procedure at path 'login'
  // The syntax is identical to creating queries
  .mutation('login', {
    // using zod schema to validate and infer input values
    input: z
      .object({
        name: z.string(),
      })
    async resolve({ input }) {
      // Here some login stuff would happen

      return {
        user: {
          name: input.name,
          role: 'ADMIN'
        },
      };
    },
  })

import { trpc } from '../utils/trpc';

export function MyComponent() {
  // This can either be a tuple ['login'] or string 'login'
  const mutation = trpc.useMutation(['login']);

  const handleLogin = async () => {
    const name = 'John Doe';

    mutation.mutate({ name });
  };

  return (
    <div>
      <h1>Login Form</h1>
      <button onClick={handleLogin} disabled={mutation.isLoading}>Login</button>

      {mutation.error && <p>Something went wrong! {mutation.error.message}</p>}
    </div>
  );
}

Example​

Example