Express Middleware Exercise - Validation

Your job is to add validations to the messages being posted to your Chatroom Application's Server by implementing Middleware.

Each validation requirement below will be it's own middleware in the series.

Commit your code each time you successfully implement a new middleware handler.

Validation Requirements

Payload

req.body.message must be defined before continuing. If not defined, respond with a 422 status code and an String which describes what went wrong.

Name

Type: String
Format: Alphanumeric
Minimum Length: 3
Maximum Length: 16
Required: Yes
Additional requirements: Must not have leading or trailing spaces. Name cannot contain spaces (Alphanumeric only).

If Validation fails, respond with a 422 status code and an String which describes what went wrong.

Message

Type: String
Format: Any
Minimum Length: 12
Maximum Length: None
Required: Yes
Additional requirements: Must not have leading or trailing spaces.

If Validation fails, respond with a 422 status code and an String which describes what went wrong.

Middleware Example

router.get('/route', firstRouteHandler, secondRouteHandler);
  
function firstRouteHandler(req, res, next) {
    // continue handling this request 
    next('route');
  }
}

function secondRouteHandler(req, res, next) {
  if(err) {
    return next(err);
  }
  res.json({message: "Success"});
}

References

Middleware

Error Handling

// in your server.js file, below your routes
app.use(function(err, req, res, next) {
  console.error(err.stack);
  res.status(500).send('Something broke!');
});

400 vs 422 Status Code

sgnl/validation.md