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const crypto = require('crypto'); // base64 encode the data function bs64encode(data) { if (typeof data === "object") { data = JSON.stringify(data); } return bs64escape(Buffer.from(data).toString("base64")); } // modify the base64 string to be URL safe function bs64escape(string) { return string.replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, ""); } // base64 encode the header let bs64header = bs64encode({ alg: "HS256", typ: "JWT" }); console.log("bs64header :>>\n ", bs64header); // base64 encode the payload let bs64payload = bs64encode({ id: "5eb20004ac94962628c68b91", iat: 1589125343, exp: 1589989343, jti: "37743739b1476caa18ca899c7bc934e1aba63ba1" }); console.log("bs64payload :>> \n", bs64payload); // generate the signature from the header and payload let secret = "0d528cb666023eee0d44e725fe9dfb751263d2f68f07998ae7388ff43b1b504f"; let signature = bs64header + "." + bs64payload; let bs64signature = bs64escape(crypto .createHmac("sha256", secret) .update(signature) .digest("base64")); console.log("bs64signature>>", bs64signature); let jwt = bs64header + "." + bs64payload + "." + bs64signature; console.log("jwt>>", jwt);