reading-notes

Course 301, Entry 12: CRUD

REST Status Codes

In your own words, describe what each group of status code represents:

• 100’s = Pre-texual in nature. Gives the client information of what to expect.
• 200’s = The request was successfully received.
• 300’s = Location change of repository.
• 400’s = Error codes. The input parameters did not match any server or its requirements, includes timeouts.
• 500’s = Server errors. This is usually an indicator of a server-side issue.

What is a status code 202?

Code 202 is a validation message for asynchronous processes. It simply means that validation requirements were met.

What is a status code 308?

Permanent redirect. It points the client to another URL to access the resource. Similarly, 307 does the same but is temporary in nature.

What code would you use if an update didn’t return data to a client?

In this case, assuming no errors, it would be code 204. An example of use would be saving a document.

What code would you use if a resource used to exist but no longer does?

This would be code 410. This means the resource existed but was deleted or moved.

What is the ‘Forbidden’ status code?

The forbidden status code is 403. This code means no authorizations are needed, but access is still denied.

Build A REST API With Node.js, Express, & MongoDB

Why do we need to pull our MongoDB database string out of our server and put it into our .env?

This is due to security issues. Otherwise a DOS attack is possible, or many other forms of attacks.

What is middleware?

Middleware is the code that acts upon the resources between the database and the front-end server.

What does app.use(express.json()) do?

This line of code allows for middleware to be used and applies JSON formatting.

What does the /:id mean in a route?

The “:id” is a parameter. This can be access via req.params.id.

What is the difference between PUT and PATCH?

PUT is a complete update while PATCH is a partial update.

How do you make a default value in a schema?

To set a default, use default: to set the parameter. Then, the default value can be entered thereafter.

What does a 500 error status code mean?

This means the database had some kind of error. This is serparate from the user and client.

What is the difference between a status 200 and a status 201?

Code 201 is used for CREATE. In the header response will be the location URL of the newly created resource.

Things I want to know more about

Why would anyone feel the need to customize the error codes and extend them? Are 206 codes used for packet downloads?