[Solved] UnhandledPromiseRejectionWarning: This error originated either by throwing inside of an async function without a catch block

Hello Guys, How are you all? Hope You all Are Fine. Today I am getting the following error in my Node-Express App UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block in nodejs. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block Error Occurs ?

I am Using express in my node js application But I am getting following error in my Node-Express App.

UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 4)

Here is my code Where I am facing an error.

router.get("/checkEmail", authCheck, async (req, res) => {
  
  .catch(error => { throw error})
  emailFetch = emailFetch.data
  res.send(emailFetch)
})

How To Solve UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block Error ?

Solution 1

Here is in your code you are using .catch(error => { throw error}) which results in unhandled rejection in route handler. You can use it as like below.

router.get("/yourApicall", authCheck, async (req, res, next) => {
  try {

    data= yourdata
    res.send(data)
  } catch (err) {
    next(err);
  }
})

Solution 2

I suggest removing the below code from your code .catch(error => { throw error}). In your main function, you should put await and related code in a Try block and also add one catch block where you failure code. You can use try-catch as define below.

router.get("/apicall", authCheck, async (req, res) => {
  
try{
  // your code
}
catch (error) { 
 // your catch block code goes here
})

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

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