CORS Error when using NodeJS Connect V2 API for OAuth2 Access

[minhazfm]

Following the guide posted on Square's Developer documentation. I can run the Node OAuth 2 sample from here: (https://github.com/square/connect-api-examples/tree/master/connect-examples/oauth/node) just fine locally with the Sandbox. But when I try to run a similar setup in a local React app, the obtainToken method from the square-connect Node library throws the following error:

Refused to set unsafe header "User-Agent"

Access to XMLHttpRequest at 'https://connect.squareupsandbox.com/oauth2/token' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

client.js:772 POST https://connect.squareupsandbox.com/oauth2/token net::ERR_FAILED

Not sure how to overcome the CORS policy here. Could I get some assistance please?

[minhazfm]

Closing issue as it was resolved to setting a proxy for the create-react-app: https://create-react-app.dev/docs/proxying-api-requests-in-development/