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Node.js util.types.isNativeError() Method

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The util.types.isNativeError() (Added in v10.0.0) method is an inbuilt application programming interface of the util module which is used to identify whether the value is an instance of a built-in Error type in the node.js. If the instance has an inbuilt ‘Error’ then it returns ‘true’ otherwise returns ‘false’.

Syntax:

util.types.isNativeError( value )

Parameters: This method accepts a single parameter as mentioned above and described below:

value <any>: It is a required parameter that accepts any variable, Class, Function, Object, or JavaScript primitive or any datatype.

Return <Boolean>: This returns a boolean value, If the instance has an inbuilt ‘Error’ then it returns ‘true’ otherwise returns ‘false’.

Below examples illustrate the use of util.types.isNativeError(value) method in Node.js.

Example 1: Filename: index.js 

javascript




// Node.js program to demonstrate the   
// util.types.isNativeError() Method
 
// Import the util module
const util = require('util');
const {types} = require('util');
 
// Passing no values => Returns false
console.log("1.>", util.types.isNativeError()); 
 
// Passing new inbuilt Error => Returns true
console.log("2.>", util.types.isNativeError(new Error()));
  
// Passing new inbuilt TypeError => Returns true
console.log("3.>", util.types.isNativeError(new TypeError()));
  
// Passing new inbuilt Error => Returns true
console.log("4.>", types.isNativeError(new RangeError()));
  
// Passing new inbuilt Error => Returns true
console.log("5.>", util.types.isNativeError(new SyntaxError()));
   
// Passing new inbuilt Error => Returns true
console.log("6.>", types.isNativeError(new ReferenceError()));  






                        









													
													
												

												
												

													
													
Run index.js file using the following command:

													
													
												

												
												

													
													
node index.js

													
													
												

												
												

													
													
Output:

													
													
												

												
												

													
													
1.> false
2.> true
3.> true
4.> true
5.> true
6.> true

													
													
												

												
												

													
													
Example 2: Filename: index.js 

													
													
												

												
												

													
													




javascript















                                    




                                    

                                    




                                    




                                    

                                    

                                    
                                




















// Node.js program to demonstrate the    


// util.types.isNativeError() Method


 


// Import the util module 


const util = require('util');


const {types} = require('util');


 


// Directly importing and calling types


console.log("1.>", types.isNativeError(new Error("ksdjfhks")));


 


// Passing data/values directly


console.log("2.>", util.types.isNativeError(1234+'45'));  


 


// Passing Error.stack directly


console.log("3.>", util.types.isNativeError(Error.stack));  


 


// Passing util.types.isNativeError() method directly


console.log("4.>", 


util.types.isNativeError(util.types.isNativeError(new Error())));


 


// Passing util.types.isNativeError() method with 'Error'


console.log("5.>", 


util.types.isNativeError(util.types.isNativeError(Error)));


 


// Creating object


const object1 = {};


Error.captureStackTrace(object1);


 


// Passing object


console.log("6.>", util.types.isNativeError(object1.stack)); 


 


// Passing Error.captureStackTrace(object1)


console.log("7.>", 


util.types.isNativeError(Error.captureStackTrace(object1))); 


 


// Passing util.types.isNativeError() method with


/// nested error message


console.log("8.>", 


util.types.isNativeError(util.types.isNativeError(new Error())));


 


// Creating new error


const error = new Error('Some Error message');


 


// Passing new Error indirectly 


console.log("9.>", util.types.isNativeError(error)); 


 


// Passing error message 


console.log("10.>", util.types.isNativeError(error.message)); 


 


// Printing error


console.log("11.>", util.types.isNativeError(


        console.error(error.message))); 



















                        







                        









													
													
												

												
												

													
													
Run index.js file using the following command:

													
													
												

												
												

													
													
node index.js

													
													
												

												
												

													
													
Output:

													
													
												

												
												

													
													
1.> true
2.> false
3.> false
4.> false
5.> false
6.> false
7.> false
8.> false
9.> true
10.> false
Some Error message
11.> false

													
													
												

												
												

													
													
Reference: https://nodejs.org/api/util.html#util_util_types_isnativeerror_value 

													
													
												

												
												

													
													

													
													
												

												
												

													
													

													
													
												

												
												

													
													

													
													
												

												
													
											

											
										

									

									

										
										
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										#Node.js-Methods
										
										#Node.js-util-module
										
										#Node.js
										
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