Yelp Fusion API Test

What This Repository Demonstrates

This repository is a quick test of CORS and CORS-anywhere methods to access the Yelp Fusion (v3) API under React 16. CORS fails in the client-side browser (due to Yelp failing to return an Access-Control-Allow-Origin header), hence the required use of CORS-Anywhere.

If you're getting feedback from e.g. Chrome showing the following error when trying to contact the Yelp API, then you'll need the information this repository provides.

Failed to load https://api.yelp.com/v3/businesses/search?term=pizza&latitude=33.389757599999996&longitude=-111.9343636&limit=25:
Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Origin 'http://localhost:3000' is therefore not allowed access. The response had HTTP status code 403.

How to Use This Repository

To use this repo to demonstrate the Yelp API issue, and demonstrate a work-around:

Build the local client
Build the CORS-Anywhere helper
Configure your .env file to point at your CORS-Anywhere helper instance
Run locally with yarn start. This should open your default web browser to http://localhost:3000.

Build the Client Locally

Clone this repo into a local folder
Type yarn install to add all the dependencies.
Rename .env-sample to .env, and replace the REACT_APP_YELP_API_key value with your own. Also replace the REACT_APP_CORS_ANYWHERE_URL value with your own Heroku build of the CORS-Anywhere package.

Build and Push a CORS-Anywhere Helper Service to Heroku

This app requires use of Rob--W's CORS-Anywhere Helper Service to proxy Yelp API calls made from client code running in a web browser.

Definitely look at Rob--W's GitHub repository, but you can deploy your own Heroku build of CORS-Anywhere by doing the following:

Change to a local directory that holds your GitHub repos. For example, my own GitHub repos all live under ~/Documents/GitHub (or C:\Users\Chris\Documents\GitHub if I'm on Windows)
git clone https://github.com/Rob--W/cors-anywhere.git
cd cors-anywhere/
npm install or yarn install, depending on which package manager you're using. I tend towards yarn these days.
heroku create (Assuming you already have the Heroku CLI tools installed)
git push heroku master

These steps will give you a site running the CORS-Anywhere code out on Heroku. It's randomized and slugified, so your site name may be something like https://shrouded-basin-35126.herokuapp.com/

Configure Local Instance with Your CORS-Anywhere Heroku Instance

In your .env file, replace the default value for REACT_APP_CORS_ANYWHERE_URL with your Heroku server instance of CORS-Anywhere.

Optional: Build a Heroku-Based Client

See https://github.com/mars/create-react-app-buildpack for information on Heroku deployment if you want to deploy this client-side code to Heroku.
- NOTE: Heroku won't work with dotenv, which I'm using here for local testing.
- Instead, set up the Heroku environment variables thusly:
```
heroku config:set REACT_APP_YELP_API_key="<value from your .env file>" REACT_APP_CORS_ANYWHERE_URL="<value from your .env file>"
```
  Do not forget to also add heroku config:set NODE_ENV=production to tell Heroku that you want a production build of the app, rather than a development build!
  - You can also edit config vars on your app’s settings tab on your Heroku Dashboard, at https://dashboard.heroku.com/apps/YOUR-APP-NAME/settings.
Visit https://dashboard.heroku.com/apps to see a list of your applications deployed on Heroku.
Make sure your GIT repo is up-to-date, then git push heroku master should push the master branch of the yelp-fusion-api-test repo out to Heroku for production use.