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http://localhost:8080/realms/<MY_REALM>/protocol/openid-connect/token

router.get('/anonymous', function(req, res) {
  res.status(200).json({
    messgae: "[HELLO ###ANONYMOUS###]"
router.get('/user', keycloak.protect('user'), function(req, res) {
  res.status(200).json({
    messgae: "[HELLO ###USER###]"
router.get('/admin', keycloak.protect('admin'), function(req, res) {
  res.status(200).json({
    messgae: "[HELLO ###ADMIN###]"
router.get('/all-user', keycloak.protect(['user', 'admin']), function(req, res) {
  res.status(200).json({
    messgae: "[HELLO ###AALLL USER###]"
})

Could not obtain grant code: Error: Grant validation failed. Reason: Misconfigured parameters while validating token. Check your keycloak.json file!

{
    "realm" : "my-realm",
    "realm-public-key" : "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmhlpOZBxGjjQD0TTPOzSfmxFBTgpNHWwGOdLn4uK2Y7gLu4Z1BJCISIwfCqfEDmCBQO19X/caNMo0opbZl2qdEnsu7FGN90PWFaBUAS2DASRwhL2UZbuKOVLsUIXpDnDrAGP8ZR5nmQRkWaP7kYT7AErGrcBh4qfzXiw7aIEGI4e24MvK0L1AOVcv2ewPT4I2XAmjPcBsbcrMdrlU5kRYmuPm1Yix2J638VnvPuHRpqSt94e5LiBuo9NnP4pq6G8BZ29D02QKeV8zZcaD4N8clGSI2RMbr3mTp2hAZlNqRtFldpICfapWc5bnmR72UH8ZyV0b/D2LpqUFUirI2KJXQIDAQAB",
    "auth-server-url" : "http://localhost:8080/auth",
    "ssl-required" : "external",
    "resource" : "my-client",
    "public-client" : true
}

const Keycloak = require('keycloak-connect')
const express = require('express')
const session = require('express-session')
const router = express()
const server = router.listen(3000, function () {
  const host = server.address().address
  const port = server.address().port
  console.log('Example app listening at http://%s:%s', host, port)
function get_user_name(token) {
    if (!token) {
        return 'Error';
    const [header, payload, signature] = token.split(".")
    if(JSON.parse(Buffer.from(payload, "base64")).preferred_username) {
        return JSON.parse(Buffer.from(payload, "base64")).preferred_username;
    return 'No User Name';
const memoryStore = new session.MemoryStore()
router.use(session({
  secret: 'mySecret',
  resave: false,
  saveUninitialized: true,
  store: memoryStore
const keycloak = new Keycloak({
  store: memoryStore
router.use(keycloak.middleware({
  logout: '/logout',
  admin: '/'
router.get('/login', keycloak.protect(), function (req, res) {
    console.log('user login success!');
router.get('/user', keycloak.protect('user'), function (req, res) {
    console.log('hello user: ' + get_user_name(req.session['keycloak-token']));
router.get('/admin', keycloak.protect('admin'), function (req, res) {
    console.log('hello admin: '  + get_user_name(req.session['keycloak-token']));
router.get('/all-user', keycloak.protect(['user', 'admin']), function (req, res) {
    console.log('hello user & admin :' + get_user_name(req.session['keycloak-token']));
})

{
    "name": "nodejs-keycloak-example",
    "version": "0.1.0",
    "main": "index.js",
    "scripts": {
        "start": "node index.js"

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