index.js

const jwt = require('jsonwebtoken');

const privateKey = `-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIA/Hp5bQItOQCKBdgH6sHLZAhTBNID/x8Fb5xwrWrZVQoAoGCCqGSM49
AwEHoUQDQgAEAwTleT8M/rlF8nE/qhY+26axJzFroVz7WciGZYxB1wI/U0jJgyr5
PBdQASFywG+QgGP/xD3eEozUnVOX+1z+9g==
-----END EC PRIVATE KEY-----`;
const publicKey = `-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEAwTleT8M/rlF8nE/qhY+26axJzFr
oVz7WciGZYxB1wI/U0jJgyr5PBdQASFywG+QgGP/xD3eEozUnVOX+1z+9g==
-----END PUBLIC KEY-----`;

const token = jwt.sign({"toot": "peep"}, privateKey, { algorithm : 'RS256' });

console.log(token);
process.exit();