404 error app/api/user/route.ts with mongodb

I’m creating next.js project with mongodb.
I completed to deploy to vercel.
but i have a problem.

not working app/api/user/route.ts in deploy site.
it is displayed 404 not found.
but the data exist on mongodb and working on local.
I don’ know how to resolve it.

import { NextRequest, NextResponse } from "next/server";
import { connectDb } from "@/utils/database";
import { UserModel } from "@/models/userModel";

export const GET = async (request: NextRequest) => {
  try {
    await connectDb();

    // get name from query
    const { searchParams } = new URL(request.url);
    const name = searchParams.get("name");

    if (!name) {
      return NextResponse.json(
        { message: "message" },
        { status: 400 }
      );
    }

    const user = await UserModel.findOne({ name });

    if (user) {
      return NextResponse.json({
        message: "successful",
        user: user,
      });
    } else {
      return NextResponse.json(
        { message: "failed" },
        { status: 404 }
      );
    }
  } catch (error) {
    return NextResponse.json(
      { message: "failed" },
      { status: 500 }
    );
  }
};

↑this is my app/api/user/route.ts

import mongoose from "mongoose";

export const connectDb = async () => {
  try {
    await mongoose.connect(process.env.MONGODB_URI || "");
  } catch (error) {
    console.log("error");
    throw new Error();
  }
};

this is my utils/database.ts

 try {
      const response = await fetch(
        `${process.env.NEXT_PUBLIC_API_URL}/user?name=${encodeURIComponent(
          username
        )}`,
        {
          method: "GET",
        }
      );

      const data = await response.json();

      if (response.ok) {
        setUser(data.user);
      } else {
        setError(data.message);
      }
    } catch (error) {
      setError("failed");
    }

What is the problem…
(sorry… I’m a beginner for English.)

Hi and welcome, @dmat913!

We have a community post: Debugging 404 Errors that may be helpful. :smile: Can you read through it and let us know if any of the suggestions help with your issue?