json middleware is part of Express v4.16.0

src/middleware/index.js

@@ -3,7 +3,6 @@
 exports = module.exports = {
     cookieParser: require('cookie-parser'),
     cors: require('./cors.js'),
-    json: require('body-parser').json,
     proxy: require('./proxy-middleware.js'),
     lastMile: require('connect-lastmile'),
     multipart: require('./multipart.js'),