key is invalid error with RS256 generated from https://mkjwk.org/

[prakharmishra]

I am using the library like this:

package main

import (
	"fmt"
	"time"

	"github.com/dgrijalva/jwt-go"
)

var jwtKey = []byte(`
{
    "p": "7KKWYO2Mdmjm1eIAjpMOtcjfYlslYVthVVecxJyq4sr9v9HUxmN-VWCJaDBBb9iTm8zCoRNauiNhgk4vViK56T6Ooo93GHiHsVtpIB9MgL1NZuHoHZtQL6iq1faRp2A5Xca8TrcxQ4k8snHpndjjnrQj1XtvEESzL23lu-S-280",
    "kty": "RSA",
    "q": "rr-eu9klZeYH8D3DZ6OmBlVFCi7dFHx9uepcrHOlxeZJBg9y5882X2Uw_z4OfIBUHNux0yKXkkHhehiM7gSxb7m75ap54LWG35q9JGU2qI_DvlvEgMObqz-YER4satI7LPbIMISHUyqkcN86SA9olVLNK3kDEsukx_LcnKs7bxc",
    "d": "QxO-9QTZtZ7oHIifMBlFInIstI8CYdVobLhbl_OFA8vTygX_ZG5-i-REYaYUJyx_WwHYYI8HsWmbZsrf2rc7Y76E2OCRGuyEK4lA-YeP2FYX09hwuIvYTXc_KErenp6rbo8W0EU49FIYdTk7Szlx9RF-gatOZXVJqM-nHnh3sHm3facnBba94_2L91eIKezJ1VeuWwxpR2sRZzbQdrOI_sPYurIdLZGeTGYF7kKIcgyMydxchRpiKKapXm--sPewNlzw7NMMU5PLXKIc9YA8rKU2G1OgRxVOrleeKiK4zLZY46ry60Lu2zzwLTQL6uyiGIG0f9hp0TYZY8qedShS-Q",
    "e": "AQAB",
    "use": "sig",
    "kid": "sdfasda",
    "qi": "dsVrwVQnK9WigTluBTq5DTHkbRoeKhp67y8i4LaE5hst3vSd_VrFB1aYhJuHD-c0B8cBt-QQbqN7sUit7OiXS8u7iIoIuTTsS0vBexpJpPMv-GGOQnBrc0pyFvLX_HjJqZRBH4ZsBmI4Zfn6E0NCjEuSPfksxYYz4Df62T9jrgM",
    "dp": "tE7bCPZYziz2n0i7JehWEBwEYrySyhFIJDBDCulZqMAGA_COEbDkJYgOi24hnmjHaLLoJrZJroWhGhobJaYGRPze0G1C0UmeE31UqB5RO9OCs_80z8J1oisCKVDdAU1nyNXSzKP4DL74mfwEh7spDdezakrIgPvoER7LK5WL_I0",
    "alg": "RS256",
    "dq": "K79vJsoDEdKX1C4yOEUA8H7ybM00rcdI1n10u_ur2bKAP5Moih4XF6TGsm-_wq2B4UOi7h-v4H67ywxQY9oq7bSK9MFMB9SKMnqTtYPdPi_XqlVhCXdvBl1CXa63IfsFs4kIrxTOqCR5zIQmHBo3bYKwOJzwBwmSdDg5wMMhevs",
    "n": "oYeiPhASwtqH9RhjfaEPxaw3j-iWIwwDvrnIaPgUT9A175fJ10mKWJ4butQPXQJKcGHcOJ88pftcXe_KBW2sGj5VYyFiPzVpU3C5TFITbtseTEo0VCNDisow2no4BVFDj2h95EA9WGwbktyqE0C4Dc2-_iBXJlQuOY_RBlOlEOxRzxEBxMOiolN9X2CfqJ6DpFKR3wr58pbaYGgdzTL6dRA_aJ7P-V7x8_IYFGYqwYjThIXvWOGwWaSR6Q4iA8pwuNOPegJeFxPom0u67vMZ65EU_c0WH4kv8ucqQq7g_GgL2IDmWaRYykiy6OE8G-hHAGIW898IoyHpkW3K5bKiaw"
}
`)

type Claims struct {
	Username string `json:"username"`
	jwt.StandardClaims
}

func main() {
	expirationTime := time.Now().Add(5 * time.Minute)

	claims := &Claims{
		Username: "prakhar",
		StandardClaims: jwt.StandardClaims{
			// In JWT, the expiry time is expressed as unix milliseconds
			ExpiresAt: expirationTime.Unix(),
		},
	}

	// Declare the token with the algorithm used for signing, and the claims
	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
	// Create the JWT string
	tokenString, err := token.SignedString(jwtKey)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(tokenString)

	tkn, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
		return jwtKey, nil
	})
	if err != nil {
		if err == jwt.ErrSignatureInvalid {
			fmt.Println(err)
			return
		}
		fmt.Println(err)
	}
	if !tkn.Valid {
		fmt.Println(err)
		return
	}

	// Finally, return the welcome message to the user, along with their
	// username given in the token
	fmt.Printf("Welcome %s!", claims.Username)
}

And its not able to use the key. It fails saying key is invalid. Could you please look into this?