Update README.md

Author: typicode

README.md

@@ -350,6 +350,28 @@ server.listen(3000, function () {
 })
 ```
 
+#### Access control example
+
+```js
+var jsonServer = require('json-server')
+var server = jsonServer.create()
+var router = jsonServer.router('db.json')
+var middlewares = jsonServer.defaults()
+
+server.use(middlewares)
+server.use(function (req, res, next) {
+ if (isAuthorized(req)) { // add your authorization logic here
+   next() // continue to JSON Server router
+ } else {
+   res.sendStatus(401)
+ }
+})
+server.use(router)
+server.listen(3000, function () {
+  console.log('JSON Server is running')
+})
+```
+
 #### Custom output example
 
 To modify responses, overwrite `router.render` method: