# build back-end server

1.npm install bcrypt-node.js
 [https://www.npmjs.com/package/bcrypt-nodejs](Link)

2  npm install cors

*localhost/:1 Access to fetch at 'http://localhost:3000/' from origin 'http://localhost:3001' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.*