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Node.js x509.fingerprint Property

Last Updated : 26 Mar, 2021
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The x509.fingerprint is an inbuilt application programming interface of class X509Certificate within crypto module which is used to get the SHA-1 fingerprint of this certificate.

Syntax:

const x509.fingerprint

Parameters: This property does not accept any arguments as a parameter.

Return Value: This property returns the SHA-1 fingerprint of this certificate.

How to generate a Public certificate?

Public certificate Open notepad and copy-paste the following key and save the file as public-cert.pem

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Example 1:

index.js




// Node.js program to demonstrate the  
// x509.fingerprint function
  
// Importing crypto module
const {X509Certificate} = require('crypto')
  
// Importing fs module
const fs = require('fs')
  
// getting object of a PEM encoded X509 Certificate. 
const x509 = new X509Certificate(fs.readFileSync('public-cert.pem'));
  
// getting the SHA-1 fingerprint of this certificate.
// by using x509.fingerprint function
const value = x509.fingerprint
  
// display the result
console.log("SHA-1 fingerprint of this certificate :- " + value)
 






                        










Run the index.js file using the following command.


node index.js


Output:


SHA-1 fingerprint of this certificate :- 
78:55:AE:43:DC:ED:2F:2D:31:EA:D5:17:1A:22:
D3:8A:35:76:66:0D


Example 2:




index.js















                                    




                                    

                                    




                                    




                                    

                                    

                                    
                                




















// Node.js program to demonstrate the   


// x509.fingerprint function 


  


// Importing crypto module 


const {X509Certificate} = require('crypto') 


  


// Importing fs module 


const fs = require('fs') 


  


// display the result 


console.log("SHA-1 fingerprint of this certificate :- " +  


           (new X509Certificate(fs.readFileSync('public-cert.pem'))) 


           .fingerprint) 



















                        







                        










Run the index.js file using the following command.


node index.js


Output:


SHA-1 fingerprint of this certificate :- 
78:55:AE:43:DC:ED:2F:2D:31:EA:D5:17:1A:22:D3:
8A:35:76:66:0D


Reference: https://nodejs.org/dist/latest-v15.x/docs/api/crypto.html#crypto_x509_fingerprint




                            
                            
                        


                                                                              

                                        

                                                                                

                                                                

                            
                                

                                
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                                                    RohitPrasad3                                                

                                                

                                                

            
                                            

                                            
                                        

                                        

                                            
                                            

                                                
                                                
                                            

                                            
                                                                            

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