This code prompts the user to enter the file path using the question method of the readline interface, and then calculates the SHA-256
hash of the file using the crypto module. The hash is calculated by reading the file into a buffer using the fs module, and then passing the buffer to the update method of the createHash
function. The digest method is then used to convert the hash to a hexadecimal string, which is output to the console. Finally, the readline
interface is closed.
Here is a summary of what each line of code does:
const fs = require('fs')
: This line imports the fs (file system) module, which provides functions for interacting with the file system, such as reading and writing files.const crypto = require('crypto')
: This line imports thecrypto
module, which provides cryptographic functionality, including functions for calculating hashes.const readline = require('readline')
: This line imports the readline module, which provides an interface for reading input from the command line.const rl = readline.createInterface({ input: process.stdin, output: process.stdout })
: This line creates a readline interface withprocess.stdin
as the input stream and process.stdout as the output stream.rl.question('Enter the file path: ', (filePath) => {...})
: This line prompts the user to enter the file path using the question method of thereadline
interface, and passes the user's input to a callback function as the filePath argument.const fileBuffer = fs.readFileSync(filePath)
: This line reads the file into a buffer using thereadFileSync
function of the fs module.const hash = crypto.createHash('sha256').update(fileBuffer).digest('hex')
: This line calculates theSHA-256
hash of the file buffer using the createHash function of the crypto module, and converts the hash to a hexadecimal string using the digest method.console.log(hash)
: This line outputs the hash to the console.rl.close()
: This line closes the readline interface.