Uploaded February 2026 | Updated September 2026, 2 weeks ago
In Part 10 of the React POS (Point of Sale) Application series, we connect our "Add Category" form to the backend and insert category data into a MySQL table using a clean, secure Node.js + Express REST API.
We will start inside the backend category routes file and create a POST /categories endpoint. This route is protected with an Authenticate Token (JWT) middleware, so only logged-in users can create categories. Next, we add strong request validation using express-validator including trimming and checking that category_name is not empty, and ensuring category_status is limited to valid values like Active or Inactive.
After validation passes, we handle database operations safely inside a try/catch block. Before inserting, we run a query to check for duplicate category names, preventing repeated records. If a duplicate exists, the API returns a 409 Conflict response. If everything is correct, we insert the new category with a parameterized query to reduce SQL injection risk and respond with 201 Created.
Finally, we restart the server, test the endpoint from the React UI, verify validation messages, and confirm the new category appears in the list page.
If you are building a real-world POS (Point of Sale) system with React + MySQL, this episode is a must-watch.
For Source Code - webslesson.info/2026/01/react-pos-system-nodejs-mysql.html
#ReactJS #POS #CRUD #Axios #Bootstrap
In Part 10 of the React POS (Point of Sale) Application series, we connect our "Add Category" form to the backend and insert category data into a MySQL table using a clean, secure Node.js + Express REST API.
We will start inside the backend category routes file and create a POST /categories endpoint. This route is protected with an Authenticate Token (JWT) middleware, so only logged-in users can create categories. Next, we add strong request validation using express-validator including trimming and checking that category_name is not empty, and ensuring category_status is limited to valid values like Active or Inactive.
After validation passes, we handle database operations safely inside a try/catch block. Before inserting, we run a query to check for duplicate category names, preventing repeated records. If a duplicate exists, the API returns a 409 Conflict response. If everything is correct, we insert the new category with a parameterized query to reduce SQL injection risk and respond with 201 Created.
Finally, we restart the server, test the endpoint from the React UI, verify validation messages, and confirm the new category appears in the list page.
If you are building a real-world POS (Point of Sale) system with React + MySQL, this episode is a must-watch.
For Source Code - webslesson.info/2026/01/react-pos-system-nodejs-mysql.html
#ReactJS #POS #CRUD #Axios #Bootstrap
