#Error while deploying my next.js app

1 messages · Page 1 of 1 (latest)

rocky star
#

I'm facing the following error when deploying my next.js app:

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
at JSON.parse (<anonymous>)
at parseJSONFromBytes (node:internal/deps/undici/undici:5329:19)
at successSteps (node:internal/deps/undici/undici:5300:27)
at fullyReadBody (node:internal/deps/undici/undici:1447:9)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async specConsumeBody (node:internal/deps/undici/undici:5309:7)
at async a (/vercel/path0/.next/server/app/page.js:6:4836)
at async u (/vercel/path0/.next/server/app/departments/page.js:1:4571)
SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
at JSON.parse (<anonymous>)
at parseJSONFromBytes (node:internal/deps/undici/undici:5329:19)
at successSteps (node:internal/deps/undici/undici:5300:27)
at fullyReadBody (node:internal/deps/undici/undici:1447:9)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async specConsumeBody (node:internal/deps/undici/undici:5309:7)
at async a (/vercel/path0/.next/server/app/page.js:6:4836)
at async u (/vercel/path0/.next/server/app/departments/page.js:1:4571)
Error occurred prerendering page "/departments". Read more: https://nextjs.org/docs/messages/prerender-error

Prerender Error
limpid gobletBOT
#

Hi @rocky star. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

The error message you're seeing, SyntaxError: Unexpected token '<', is typically thrown when you're trying to parse a JSON object but the input is not valid JSON. In this case, it seems like the input starts with <!DOCTYPE, which suggests that an HTML document is being returned instead of a JSON object.

This could be due to a variety of reasons, such as an incorrect endpoint being hit, or the server returning an HTML error page instead of the expected JSON response.

One of the users in the knowledge source (https://github.com/vercel/next.js/issues/47554) mentioned that they were able to resolve a similar issue by switching their Node.js version from 18.15 to 16.13. This might be worth trying in your case.

Another user suggested that the issue was due to trying to stringify an already parsed JSON object. They resolved the issue by removing the redundant use of JSON.stringify on the fetch response.

Without more specific details about your application and its configuration, it's hard to provide a more precise solution. However, I would recommend checking the endpoints your application is hitting and ensuring they are returning valid JSON. If you're using fetch or a similar function to get the JSON, make sure you're not stringifying the response if it's already a JSON object.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

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rocky star
#

How should I fetch data using Prisma in Next.js route.js file in an API endpoint? @limpid goblet

limpid gobletBOT
#

Let me check the knowledge base for you. One moment! :books:

#

To fetch data using Prisma in a Next.js route.js file in an API endpoint, you can follow these steps:

  1. First, import the PrismaClient from the Prisma package.
import { PrismaClient } from "@prisma/client";
  1. Then, create a new instance of PrismaClient.
const prisma = new PrismaClient();
  1. Now, you can use the PrismaClient instance to fetch data from your database. For example, if you have a user model in your Prisma schema, you can fetch all users like this:
export async function GET(request: Request) {
  const users = await prisma.user.findMany();
  return new NextResponse.json(users);
}

This function will handle GET requests to your API endpoint and return a JSON response with all users from your database.

Remember to replace user with the actual model name in your Prisma schema. Also, make sure to handle errors appropriately and close the PrismaClient connection when you're done.

Here is a complete example from the knowledge source (https://github.com/vercel/next.js/issues/50491):

import { NextRequest, NextResponse } from "next/server";
import { PrismaClient } from "@prisma/client";

const prisma = new PrismaClient();

export async function GET(request: Request) {
  const users = await prisma.user.findMany();
  return new NextResponse.json(users);
}

This example handles GET requests to the API endpoint and returns a JSON response with all users from the database.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: