fix(guide): restructure curriculum guide articles (#36501)
* 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
This commit is contained in:
Randell Dawson
mrugesh
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---
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title: Exercise Tracker
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---
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## Exercise Tracker
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# Exercise Tracker
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This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/apis-and-microservices/apis-and-microservices-projects/exercise-tracker/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
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---
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title: File Metadata Microservice
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---
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## File Metadata Microservice
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# File Metadata Microservice
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This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
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---
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title: APIs and Microservices Projects
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---
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## APIs and Microservices Projects
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# APIs and Microservices Projects
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This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/quadratic-equations/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
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---
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title: Request Header Parser Microservice
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---
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## Request Header Parser Microservice
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# Request Header Parser Microservice
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This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/apis-and-microservices/apis-and-microservices-projects/request-header-parser-microservice/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
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title: Timestamp Microservice
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---
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## Timestamp Microservice
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# Timestamp Microservice
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---
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 Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program  and write your own code 
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###  Problem Explanation:
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## Problem Explanation
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- You need to write a microservice that will return a JSON with the date in Unix format and in a human-readable date format. The JSON format is like the example output, "{"unix":1451001600000, "utc":"Fri, 25 Dec 2015 00:00:00 GMT"}".
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- The response depends on the URL. If the API endpoint is hit with no additional information, it returns the JSON with the current time.
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@@ -20,38 +17,37 @@ title: Timestamp Microservice
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- [Date at MDN:](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date)
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##  Hint: 1
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---
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## Hints
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## Hint: 1
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You will need to create the '/api/timestamp/' endpoint separately from the endpoint that reads the date to be parsed from the URL. You won't need a conditional to deal with this endpoint.
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> _try to solve the problem now_
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##  Hint: 2
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## Hint: 2
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Date.valueOf() and Date.toUTCString() will generate the correct strings for unix: and utc:. No need to import the Moment library!
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> _try to solve the problem now_
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##  Hint: 3
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## Hint: 3
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The Javascript Date object checks for dates that are invalid dates under ISO-8601. Use a Javascript REPL or a short Node script to try it out. [Here is a free online service that lets you test some JS code.:]https://repl.it/site/languages/javascript
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> _try to solve the problem now_
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## Spoiler Alert!
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---
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## Solutions
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**Solution ahead!**
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##  Basic Code Solution:
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<details><summary>Solution 1 (Click to Show/Hide)</summary>
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```javascript
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app.get('/api/timestamp/', (req, res) => {
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app.get("/api/timestamp/", (req, res) => {
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res.json({ unix: Date.now(), utc: Date() });
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});
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app.get('/api/timestamp/:date_string', (req, res) => {
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app.get("/api/timestamp/:date_string", (req, res) => {
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let dateString = req.params.date_string;
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//A 4 digit number is a valid ISO-8601 for the beginning of that year
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@@ -64,15 +60,15 @@ app.get('/api/timestamp/:date_string', (req, res) => {
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let dateObject = new Date(dateString);
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if (dateObject.toString() === 'Invalid Date') {
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res.json({ error: 'Invaid Date' });
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if (dateObject.toString() === "Invalid Date") {
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res.json({ error: "Invaid Date" });
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} else {
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res.json({ unix: dateObject.valueOf(), utc: dateObject.toUTCString() });
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}
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});
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```
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### Code Explanation:
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#### Code Explanation
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- This is a pretty straightforward application of the lessons, Basic Node and Express - Serve JSON on a Specific Route
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and Basic Node and Express - Get Route Parameter Input from the Client. The added wrinkle is the use of Javascript's native Date object.
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@@ -81,9 +77,4 @@ app.get('/api/timestamp/:date_string', (req, res) => {
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That's it. There is no intermediate or advanced solution yet. If you have a better, more elegant solution, help us all out and contribute them!
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##  NOTE TO CONTRIBUTORS:
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-  **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
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- Add an explanation of your solution.
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- Categorize the solution in one of the following categories -- **Basic**, **Intermediate** and **Advanced**. 
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</details>
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---
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title: URL Shortener Microservice
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---
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## URL Shortener Microservice
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# URL Shortener Microservice
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---
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## Problem Explanation
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The core features to complete this exercise are the creation and retrieval of URLs from the Database.
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## Creating Short URL
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---
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## Hints
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### Hint 1
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Creating Short URL
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- Connect to your database instance.
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> **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`
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- Receive a POST request containing an URL to be saved on Database.
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@@ -16,11 +24,10 @@ The core features to complete this exercise are the creation and retrieval of UR
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- There is a bunch of samples over the internet how to generate some kind of identifier, try to explore it or create your own.
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- An example of how this should look like: `{'url': www.freecodecamp.org, 'hash': 'ef49fa8b4'}`
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## Retrieving Short URL
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### Hint 2
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Retrieving Short URL
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- Receive a GET request containing an identifier used to find a stored URL.
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- Try to find one URL saved for this identifier
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- Redirect user to URL.
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> **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.
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- Remember to handle error situations with proper response like, `res.json({"error":"invalid URL"});
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