Helmet added (#34)

package-lock.json

         "cors": "^2.8.5",
         "express": "^4.18.1",
         "express-jwt": "^7.7.2",
+        "helmet": "^5.1.0",
         "joi": "^17.6.0",
         "jsonwebtoken": "^8.5.1",
         "mongodb": "^4.6.0",
         "node": ">=8"
       }
     },
+    "node_modules/helmet": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-5.1.0.tgz",
+      "integrity": "sha512-klsunXs8rgNSZoaUrNeuCiWUxyc+wzucnEnFejUg3/A+CaF589k9qepLZZ1Jehnzig7YbD4hEuscGXuBY3fq+g==",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/http-cache-semantics": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/http-cache-semantics/-/http-cache-semantics-4.1.0.tgz",
       "resolved": "https://registry.npmjs.org/has-yarn/-/has-yarn-2.1.0.tgz",
       "integrity": "sha512-UqBRqi4ju7T+TqGNdqAO0PaSVGsDGJUBQvk9eUWNGRY1CFGDzYhLWoM7JQEemnlvVcv/YEmc2wNW8BC24EnUsw=="
     },
+    "helmet": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-5.1.0.tgz",
+      "integrity": "sha512-klsunXs8rgNSZoaUrNeuCiWUxyc+wzucnEnFejUg3/A+CaF589k9qepLZZ1Jehnzig7YbD4hEuscGXuBY3fq+g=="
+    },
     "http-cache-semantics": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/http-cache-semantics/-/http-cache-semantics-4.1.0.tgz",

package.json

     "cors": "^2.8.5",
     "express": "^4.18.1",
     "express-jwt": "^7.7.2",
+    "helmet": "^5.1.0",
     "joi": "^17.6.0",
     "jsonwebtoken": "^8.5.1",
     "mongodb": "^4.6.0",

src/server.js

 const swaggerJsDoc = require("swagger-jsdoc")
 const swaggerUi = require("swagger-ui-express")
 const cors = require('cors')
+const helmet = require('helmet')
 
 const swaggerOptions = {
     swaggerDefinition: {
 
 app.use(express.json())
 app.use(cors())
+app.use(helmet())
 app.use(userRouter)
 app.use(tokenRouter)