Use trpc on nextJS api route?

import { TRPCError } from '@trpc/server';
import { getHTTPStatusCodeFromError } from '@trpc/server/http';
import { appRouter } from '~/server/routers/_app';
import type { NextApiRequest, NextApiResponse } from 'next';
 
type ResponseData = {
  data?: {
    postTitle: string;
  };
  error?: {
    message: string;
  };
};
 
export default async (
  req: NextApiRequest,
  res: NextApiResponse<ResponseData>,
) => {
  /** We want to simulate an error, so we pick a post ID that does not exist in the database. */
  const postId = `this-id-does-not-exist-${Math.random()}`;
 
  const caller = appRouter.createCaller({});
 
  try {
    // the server-side call
    const postResult = await caller.post.byId({ id: postId });
 
    res.status(200).json({ data: { postTitle: postResult.title } });
  } catch (cause) {
    // If this a tRPC error, we can extract additional information.
    if (cause instanceof TRPCError) {
      // We can get the specific HTTP status code coming from tRPC (e.g. 404 for `NOT_FOUND`).
      const httpStatusCode = getHTTPStatusCodeFromError(cause);
 
      res.status(httpStatusCode).json({ error: { message: cause.message } });
      return;
    }
 
    // This is not a tRPC error, so we don't have specific information.
    res.status(500).json({
      error: { message: `Error while accessing post with ID ${postId}` },
    });
  }
};

import { TRPCError } from '@trpc/server';
import { getHTTPStatusCodeFromError } from '@trpc/server/http';
import { appRouter } from '~/server/routers/_app';
import type { NextApiRequest, NextApiResponse } from 'next';
 
type ResponseData = {
  data?: {
    postTitle: string;
  };
  error?: {
    message: string;
  };
};
 
export default async (
  req: NextApiRequest,
  res: NextApiResponse<ResponseData>,
) => {
  /** We want to simulate an error, so we pick a post ID that does not exist in the database. */
  const postId = `this-id-does-not-exist-${Math.random()}`;
 
  const caller = appRouter.createCaller({});
 
  try {
    // the server-side call
    const postResult = await caller.post.byId({ id: postId });
 
    res.status(200).json({ data: { postTitle: postResult.title } });
  } catch (cause) {
    // If this a tRPC error, we can extract additional information.
    if (cause instanceof TRPCError) {
      // We can get the specific HTTP status code coming from tRPC (e.g. 404 for `NOT_FOUND`).
      const httpStatusCode = getHTTPStatusCodeFromError(cause);
 
      res.status(httpStatusCode).json({ error: { message: cause.message } });
      return;
    }
 
    // This is not a tRPC error, so we don't have specific information.
    res.status(500).json({
      error: { message: `Error while accessing post with ID ${postId}` },
    });
  }
};