#nodejs event driven architecture : its' a software design which node js responds to events as they occur, the flow of program is determined by the events.
#nodejs content negotiation - server respond with different types( html, json, xml ) of resources for the same url request by client according to the client's preferences
#nodejs app.locals - is an object, that contain variables that can be accessed globally anywhere in the application.
#nodejs #expressjs preflight request - initiated by client(browser) and the request is handled by the CORS(cross origin resource sharing ) module. so, options(preflight request ) = client(browser) cors(cross origin resource sharing ) = server.
#Mongodb $jsonSchema - is a mongodb inbuilt validator that let's us define rules for how documents in collection should look.
#Mongodb schema validation - rules we set when storing data, how data's are stored inside the collection, like - name = string , age = Number
#Mongodb documents relationships types: 1 - one to one 2 - one to many 3 - many to many
#Mongodb embedded documents - all related data's are stored in one document. references documents - store related data's in multiple documents & collections and link them using _id
#Mongodb data modeling - deciding the structure of data inside the documents and collections
#Mongodb indexing - helps to find data faster. index types: 1 - single field index 2 - compound index 3 - unique index 4 - Text index 5 - geospatial index 6 - hashed index 7 - wildcard index
MongoDB datatypes: 1.string 2.integer 3.double 4.Boolean 5.null 6.array 7.object 8. Date 9.timestamp special datatypes: 1.objectId 2.binary data 3.regular expression 4.Min/Max keys 5.Javascript 6.Symbol
Mongodb - CRUD: C - CREATE - insertOne() , insertMany() R - READ - find() , findOne() U - UPDATE - updateOne(),updateMany(),replaceOne() D - DELETE - deleteOne() , deleteMany()
NODE JS npm modules . -find security vulnerabilities in modules- npm audit -to fix that vulnerabilities - npm audit fix
check outdated npm modules - npm outdated update to latest versions of module - npm update
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