Response Body

What would the response body be set to on a DELETE request to /cities/DoesNotExist ? Here‘s the link to the sendStatus function source code if you need to take a look.

Answer: 404

Delete Route

Create a Dynamic Route for deleting cities and handle for cities that are not in our list.

Create a DELETE route that takes the city name as its first argument, followed by a callback that takes a request and response objects as arguments.

app.delete(‘/cities/:name‘, function(request, response){

});

Use the built-in JavaScript operator delete (see MDN docs) to remove the property for the city passed as an argument. Don‘t forget to use the attribute set in app.param() to look the city up.

app.param(‘name‘, function (request, response, next) {
  request.cityName = parseCityName(request.params.name);
});

app.delete(‘/cities/:name‘, function(request, response){
    delete cities[request.cityName];
});

Use sendStatus() to respond back with a status code of 200.

app.delete(‘/cities/:name‘, function(request, response){
    delete cities[request.cityName];
  response.sendStatus(200);
});

Add an if block that checks whether the cityName provided fromapp.param() has a valid entry before attempting to delete it from thecities object. If a valid city is not found, then respond with a 404 HTTP status code using the sendStatus() function.

app.delete(‘/cities/:name‘, function(request, response){
  if(!cities[request.cityName]){
      response.sendStatus(404);
  }else{
      delete cities[request.cityName];
    response.sendStatus(200);
  }
});

var express = require(‘express‘);
var app = express();

var cities = {
  ‘Lotopia‘: ‘Rough and mountainous‘,
  ‘Caspiana‘: ‘Sky-top island‘,
  ‘Indigo‘: ‘Vibrant and thriving‘,
  ‘Paradise‘: ‘Lush, green plantation‘,
  ‘Flotilla‘: ‘Bustling urban oasis‘
};

app.param(‘name‘, function (request, response, next) {
  request.cityName = parseCityName(request.params.name);
});

app.delete(‘/cities/:name‘, function(request, response){
  if(!cities[request.cityName]){
      response.sendStatus(404);
  }else{
      delete cities[request.cityName];
    response.sendStatus(200);
  }
});

app.listen(3000);

function parseCityName(name) {
  var parsedName = name[0].toUpperCase() + name.slice(1).toLowerCase();
  return parsedName;
}