我创建一个自定义错误类

class ErrorHandler extends Error {
    constructor(message, statusCode) {
      super(message);
      this.statusCode = statusCode;
      //  captureStackTrace returns a string that reperesents the location of that particular error in the call. gives us a stack that helps us to find the location of that error in the code. this will help us to find the exact error in our code.
      Error.captureStackTrace(this, this.constructor);
    }
  }

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然后为了避免写try/catch块，我写了一个自定义函数来处理异步错误：

const catchAsyncErrors = (func) => (req, res, next) =>
  // passing a controller function
  Promise.resolve(func(req, res, next)).catch(next);

型
然后是控制器：

const getSingleItem = catchAsyncErrors(async (req, res, next) => {
  // in express we had req.params
  const item = await Item.findById(req.query.id);
  if (!item) {
    return next(new ErrorHandler("Item not found with this id", 404));
  }
  res.status(200).json({
    success: true,
    item,
  });
});

型

您可以使用res.status设置响应。

async function example(req, res) {

  switch (req.method) {
    case "GET":
      try {
        const {  data } = await foo();
        res.status(200).json({ ...data});

      } catch (error) {
        console.error(error);
        res.status(error.requestResult.statusCode).send(error.message);
      }
    default:
      res.status(405).end(); //Method Not Allowed
      break;
  }
}

export default example;

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如果你正在使用nextjs 13应用程序目录，有两种方法使用fetch new Response和另一种使用NextResponse。Video reference from codeCodegrepper

import { NextRequest, NextResponse } from "next/server";
try{
  ........
   try code 
  .........
}catch(error){
  catch (error) {
    //Response given by fetch api where we have to stringify our object 
    // return new Response(JSON.stringify({ error: "could not fetch group by" }), { status: 500 });
    
    //Here Nexjs simple our work by giving NextResponse
    return NextResponse.json({ error: "Could not fetch group by" }, { status: 500 });
  }
}

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