Node.js crypto.randomInt() Method
Last Updated :
08 Jun, 2022
The Crypto.randomInt method in Node.js is an inbuilt application programming interface of the crypto module which is used to create a random integer synchronously or asynchronously based on our usage.
Syntax:
crypto.randomInt([min, ] max [, callback])
Parameters: This method accepts three parameters as mentioned above and described below.
- min: An optional minimum value (included) for random int to be generated. Default: 0
- max: A required maximum value (excluded) for random int to be generated.
- callback: An optional callback function which gets executed after a random integer is generated. If callback is specified, method works asynchronously otherwise synchronously by default.
Return Value: The Crypto.randomInt method returns a random integer n, such that min <= n < max.
Note: The range (max – min) must be less than 248 & min and max must be safe integers.
Below examples illustrate the use of crypto.randomInt method in Node.js .
Example 1: Synchronous
Javascript
const crypto = require( "crypto" );
console.log( "Random integers less than 50:" );
console.log(crypto.randomInt(50));
console.log(crypto.randomInt(50));
console.log(crypto.randomInt(50));
console.log();
console.log( "Random integers in range 30-50:" );
console.log(crypto.randomInt(30, 50));
console.log(crypto.randomInt(30, 50));
console.log(crypto.randomInt(30, 50));
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Output:
Example 2: Asynchronous
Javascript
const crypto = require( "crypto" );
crypto.randomInt(50, (err, result) => {
if (err) console.log( "Some error occurred while" +
" generating random integer !" );
else console.log( "Random integer with max limit 50:" , result);
});
crypto.randomInt(20, 50, (err, result) => {
if (err) console.log( "Some error occurred while " +
"generating random integer !" );
else console.log( "Random integer in range 20-50:" , result);
});
|
Output :
Reference : https://nodejs.org/api/crypto.html#crypto_crypto_randomint_min_max_callback
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