Generating of Keypair

Make a new directory, install TypeScript, Solana web3.js and esrun using local terminal

mkdir generate-keypair
cd generate-keypair
npm init -y
npm install typescript @solana/web3.js esrun @solana-developers/helpers

Make a new file called keypair.ts and add the following commands in it

import { Keypair } from "@solana/web3.js";
const keypair = Keypair.generate();
console.log(`Keypair Successfully Generated`)

Run npx esrun generate-keypair.ts. You should see the following result:

Keypair Successfully Generated !

Now Keypair is the combination of publicKey and secretKey, Now we need to generate both of them together, Update the code in Keypair.ts file :

import { Keypair } from "@solana/web3.js";
 
const keypair = Keypair.generate();
 
console.log(`The public key is: `, keypair.publicKey.toBase58());
console.log(`The secret key is: `, keypair.secretKey);
console.log(`Generated Successfully !`);

Now it's time to store your Public and the Secret Key in an .env file in the form of string :

SECRET_KEY="[(a series of numbers)]"

It's time to import your secret keys from .env file to keypair.ts :

import "dotenv/config"
import { getKeypairFromEnvironment } from "@solana-developers/helpers";
 
const keypair = getKeypairFromEnvironment("SECRET_KEY");
 
console.log(
  `Finished! We've imported our secret key securely!`
);

Great Dev, U made it to here . Run the final command now npx esrun keypair.ts & result should be :

 Finished! We've imported our secret key securely!

Programs