Why I see this error : No reponse is returned from route handler

ghz 8months ago ⋅ 80 views 
import { connectDB } from "../../../lib/mongoose";
import { User, userValidation, loginValidation } from "../../models/User";
import { BadRequestError } from "../../../lib/ErrorHandler";
import asyncHandler from "../../../lib/asyncHandler";
import { NextResponse } from "next/server";
import { getDebugger } from "@/lib/debugger";
const debug = getDebugger("route");

export const POST = asyncHandler(async (req: Request) => {
  await connectDB(process.env.MONGODB_URI);
  const data = await req.json();
  const { email, firstName, lastName, password } = data;

  const { error } = userValidation.validate(data);
  if (error) throw new BadRequestError(error.details[0].message);
  const isEmailExist = await User.findOne({ email });
  if (isEmailExist) {
    throw new BadRequestError("email is already exist");
  }
  const user = new User({
    firstName,
    lastName,
    email,
    password,
  });

  await user.save();

  return NextResponse.json(
    {
      message: `Success Signing Up!`,
      success: true,
      user,
    },
    { status: 201 }
  );
});
import { getDebugger } from "./debugger";
import { NextResponse } from "next/server";

const debug = getDebugger("async-error");

const asyncHandler = (cb) => async (req) => {
  try {
    await cb(req);
  } catch (error) {
    const statusCode = error.statusCode || 500;
    const message = error.message || "Something went wrong";
    debug(`Error ${statusCode}: ${message}`);
    return NextResponse.json(
      {
        error: message,
      },
      { status: statusCode }
    );
  }
};

export default asyncHandler;

Why when I try to sign up new user, I get this error : ⨯ Error: No response is returned from route handler 'C:\Users\parse\Documents\task-rabbit-new\src\app\api\test\route.ts'. Ensure you return a Response or a NextResponse in all branches of your handler.

Also, even when I get this error I still see new users in my database. so what is going on here? thanks in advance to everyone

Answers

The error message you're encountering, "No response is returned from route handler," suggests that your POST handler is not returning a response in all branches of its execution. In your POST handler, you're calling the NextResponse.json function inside the asyncHandler, but the result of this function call is not being returned from the asyncHandler.

To fix this issue, you need to ensure that your asyncHandler function returns the result of the route handler callback cb(req). Here's the corrected implementation:

import { connectDB } from "../../../lib/mongoose";
import { User, userValidation, loginValidation } from "../../models/User";
import { BadRequestError } from "../../../lib/ErrorHandler";
import asyncHandler from "../../../lib/asyncHandler";
import { NextResponse } from "next/server";
import { getDebugger } from "@/lib/debugger";

const debug = getDebugger("route");

export const POST = asyncHandler(async (req: Request) => {
  await connectDB(process.env.MONGODB_URI);
  const data = await req.json();
  const { email, firstName, lastName, password } = data;

  const { error } = userValidation.validate(data);
  if (error) throw new BadRequestError(error.details[0].message);
  
  const isEmailExist = await User.findOne({ email });
  if (isEmailExist) {
    throw new BadRequestError("email is already exist");
  }

  const user = new User({
    firstName,
    lastName,
    email,
    password,
  });

  await user.save();

  return NextResponse.json(
    {
      message: `Success Signing Up!`,
      success: true,
      user,
    },
    { status: 201 }
  );
});

And here's the corrected asyncHandler:

import { getDebugger } from "./debugger";
import { NextResponse } from "next/server";

const debug = getDebugger("async-error");

const asyncHandler = (cb) => async (req) => {
  try {
    return await cb(req); // Return the result of cb(req)
  } catch (error) {
    const statusCode = error.statusCode || 500;
    const message = error.message || "Something went wrong";
    debug(`Error ${statusCode}: ${message}`);
    return NextResponse.json(
      {
        error: message,
      },
      { status: statusCode }
    );
  }
};

export default asyncHandler;

By returning the result of cb(req) in the asyncHandler, you ensure that the response generated by your route handler is properly returned to the caller. This should resolve the error you're encountering.

#node.js