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Node.js process.hasUncaughtExceptionCaptureCallback() Method

Last Updated : 28 Apr, 2025
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The process.hasUncaughtExceptionCaptureCallback() method is an inbuilt application programming interface of the process module which is used to get whether a callback has been set using process.setUncaughtExceptionCaptureCallback() method.

Syntax:  

process.hasUncaughtExceptionCaptureCallback()

Parameters: This method does not accept any parameters.
Return Value: It returns a boolean value specifying whether a callback has been set using process.setUncaughtExceptionCaptureCallback() or not.

Below examples illustrate the use of process.hasUncaughtExceptionCaptureCallback() method in Node.js:

Example 1:  

JavaScript 
// Node.js program to demonstrate the   
// process.hasUncaughtExceptionCaptureCallback() Method

// Include process module
const process = require('process');

console.log(process.hasUncaughtExceptionCaptureCallback());

// Printing whether a callback is set or not
if(process.hasUncaughtExceptionCaptureCallback()) {
    console.log("A callback has been set using "
    + "process.setUncaughtExceptionCaptureCallback() method");
}else{
        console.log("No callback has been set using "
        + "process.setUncaughtExceptionCaptureCallback() method");
}

Output: 

false
No callback has been set using process.setUncaughtExceptionCaptureCallback() method

Example 2:  

JavaScript 
// Node.js program to demonstrate the   
// process.hasUncaughtExceptionCaptureCallback() Method

// Include process module
const process = require('process');
 
function to_be_called(ex){
    console.log(ex);
}

// Setting callback 
process.setUncaughtExceptionCaptureCallback(to_be_called);
 
console.log(process.hasUncaughtExceptionCaptureCallback());

// Printing whether a callback is set or not
if(process.hasUncaughtExceptionCaptureCallback()){
    console.log("A callback has been set using "
    + "process.setUncaughtExceptionCaptureCallback() method");
}else{
    console.log("No callback has been set using "
    + "process.setUncaughtExceptionCaptureCallback() method");
}

Output: 

true
A callback has been set using process.setUncaughtExceptionCaptureCallback() method

Note: The above program will compile and run by using the node filename.js command.
Reference: https://nodejs.org/api/process.html#process_process_hasuncaughtexceptioncapturecallback
 


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