[Express] Level 4: Body-parser -- Delete
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; }