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* fix: restructure certifications guide articles * fix: added 3 dashes line before prob expl * fix: added 3 dashes line before hints * fix: added 3 dashes line before solutions
1.6 KiB
1.6 KiB
title
| title |
|---|
| URL Shortener Microservice |
URL Shortener Microservice
Problem Explanation
The core features to complete this exercise are the creation and retrieval of URLs from the Database.
Hints
Hint 1
Creating Short URL
- Connect to your database instance.
Note
: It's important to check your Mongoose connection status before dive into the problem, just to check if everything is okay with your database configuration. This should help:
mongoose.connection.readyState - Receive a POST request containing an URL to be saved on Database.
- Check if it is a valid URL using
dns.lookup(url, callback)- Remember you need to import the dns module with required.
- Generate some kind of identifier to save your original URL in database.
- A SHA-1 hash could be used, or even the object ID when saving the element.
- There is a bunch of samples over the internet how to generate some kind of identifier, try to explore it or create your own.
- An example of how this should look like:
{'url': www.freecodecamp.org, 'hash': 'ef49fa8b4'}
Hint 2
Retrieving Short URL
- Receive a GET request containing an identifier used to find a stored URL.
- Try to find one URL saved for this identifier
- Redirect user to URL.
Note
: The
res.redirect(url)function need that the given url, has a defined protocol (http://, https://), or it will just concatenate it as an extension of your current domain. eg: Good URL:https://www.freecodecamp.org, Bad URL:www.freecodecamp.org. Try it out. - Remember to handle error situations with proper response like, `res.json({"error":"invalid URL"});