readme.md

Express HTTP server

Now that you've built a Node HTTP server, today's assignment is to convert it to Express.

Getting started

Install express as a dependency.

npm install --save express

All work will be done in the express.js file.

Assignment

Your task is to convert the Node HTTP server you built yesterday into an Express HTTP server (specifically in a new file express.js). As before, the server app must handle the following HTTP requests and send back the appropriate HTTP response. Be mindful about responding to indices that don't exist in the database.

Request Method	Request URL	Response Status	Response Content-Type	Response Body
GET	/pets	200	application/json	[{ "age": 7, "kind": "rainbow", "name": "fido" }, { "age": 5, "kind": "snake", "name": "Buttons" }]
GET	/pets/0	200	application/json	{ "age": 7, "kind": "rainbow", "name": "fido" }
GET	/pets/1	200	application/json	{ "age": 5, "kind": "snake", "name": "Buttons" }
GET	/pets/2	404	text/plain	Not Found
GET	/pets/-1	404	text/plain	Not Found

Like before, start the HTTP server with nodemon.

nodemon express.js

Bonus

In future parts of this assignment, your server will need to handle create, update, and destroy HTTP commands. For now, add a route handler that responds to create commands by adding new pets to the database.

Request Method	Request URL	Request Body	Response Status	Response Content-Type	Response Body
POST	/pets	{ "name": "Cornflake", "age": 3, "kind": "parakeet" }	201	application/json	{ "name": "Cornflake", "age": 3, "kind": "parakeet" }
GET	/pets/3	N/A	200	application/json	{ "name": "Cornflake", "age": 3, "kind": "parakeet" }

You can send create commands to the server app with the following command

If age, kind, or name are missing from the HTTP request body or age is not an integer, then the data must not be added to the database and the server must send back the follow HTTP response.

Request Method	Request URL	Request Body	Response Status	Response Content-Type	Response Body
POST	/pets	{ "name": "", "age": "two", "kind": "" }	400	text/plain	Bad Request
GET	/pets/4	N/A	404	text/plain	Not Found

Bonus

Add 404 - Not Found middleware to handle all unknown HTTP requests and send an appropriate response.

Request Method	Request URL	Response Status	Response Content-Type	Response Body
GET	/	404	text/plain	Not Found
GET	/blah	404	text/plain	Not Found

Bonus

Add 500 - Internal Server Error middleware to handle all internal server errors and send an appropriate response. It may be helpful to test your error-handling middleware with a route handler that calls the next() function with a new Error(). See approach #2 in the [Node.js Error Handling]['error-handling'] guide for more details on how the next() function works in Express.

Request Method	Request URL	Response Status	Response Content-Type	Response Body
GET	/boom	500	text/plain	Internal Server Error

Once this is working, refactor your server's route handlers to call the next() function to handle all filesystem errors instead of using throw.