JSON Web Token in Kotlin

main.kt

package org.example

import io.jsonwebtoken.Jwts
import io.jsonwebtoken.security.Keys
import java.time.Duration
import java.util.*

fun main() {
    // val secretKey = SIG.HS512.key().build().encoded
    val secretKey = "JNu4i@rL����&�#�k\"�\u000Bv0��hn����xH)�\u007FZ�]�&\u0013�]\u0011>8�qB~M�bA�1\u0017Y�U�K"

    val jwt = Jwts.builder()
        .claims()
        .issuer("Kunal Chhabra Company")
        .id("123")
        .issuedAt(Date())
        .expiration(Date(Date().time + Duration.ofMinutes(15).toMillis()))
        .subject("Kunal Chhabra")
        .add("role", "admin")
        .add("email", "[email protected]")
        .and().signWith(Keys.hmacShaKeyFor(secretKey.toByteArray()))
        .compact()

    println(jwt)


    val jwtString =  "eyJhbGciOiJIUzUxMiJ9.eyJpc3MiOiJLdW5hbCBDaGhhYnJhIENvbXBhbnkiLCJqdGkiOiIxMjMiLCJpYXQiOjE3MzM3NTQ4MzQsImV4cCI6MTczMzc1NTczNCwic3ViIjoiS3VuYWwgQ2hoYWJyYSIsInJvbGUiOiJhZG1pbiIsImVtYWlsIjoia3VuYWxAa3VuYWwuY29tIn0.8h6b4ww9nC3q8aOdnXaFGQdrRWMzYxmOi9JcgTmEa8mV3Lf1Fo__EcuN03b6p_-pKbUmed8Fvq7wRPAY5KQuAA"

    val claims = Jwts.parser().verifyWith(Keys.hmacShaKeyFor(secretKey.toByteArray())).build().parseSignedClaims(jwtString)
    val email = claims.payload.get("email").toString()
    println(email)
}