API Server

API Server

Express Router.param() Middleware

• router.param(name, callback)
  • Adds callback triggers to route parameters, where name is the name of the parameter and callback is the callback function
  • The parameters of the callback function are:
    • req, the request object
    • res, the response object
    • next, indicating the next middleware function
    • The value of the name parameter
    • The name of the parameter

Mongoose Middleware

• Mongoose has 4 types of middleware:
  • document middleware
    • Document middleware functions, this refers to the document
    • validate
    • save
    • remove
    • updateOne
    • deleteOne
    • init (note: init hooks are synchronous)
  • model middleware
  • aggregate middleware
    • Aggregate middleware is for MyModel.aggregate()
  • query middleware
    • Query middleware functions, this refers to the query
    • count
    • deleteMany
    • deleteOne
    • find
    • findOne
    • findOneAndDelete
    • findOneAndRemove
    • findOneAndUpdate
    • remove
    • update
    • updateOne
    • updateMany

Additional Resources

• Mongoose Subdocs
• Mongoose Populate Virtuals