Build an Ecommerce App with a Free API

Build an ecommerce practice frontend around documented product and order operations.

Define a small first release

Choose a product list, product detail view and a cart interface as your first user journey. Inspect the ecommerce endpoint catalogue before designing a feature: a cart stored in browser state is different from an order persisted by the provider. Write down which screens require a request and which can be demonstrated with local state. Use synthetic customer information when practising.

Read the catalogue before coding

Open the ecommerce documentation and identify an available read operation. Copy the exact method, base URL and path into the tester. Supply required parameters and inspect the response status and JSON body. Build your model from the documented or observed response instead of assuming every ecommerce API uses the same product fields. If the service is unavailable, keep a labelled fixture for development.

Connect the frontend

In Angular, create a dedicated service for requests and keep the component focused on rendering. In React, isolate data fetching from presentation so you can review request handling independently. Encode URL values, check error statuses and make loading, empty and failure states visible. Cancel obsolete searches where your client supports it and avoid issuing the same request repeatedly during rendering.

Add forms carefully

Validate quantity and required fields before making a write request. Review the documented body schema and do not send an undocumented field simply because it exists in your form. Disable duplicate submissions while a request is pending. Shared demo data may change between requests, so handle missing records and display a useful message when an update cannot be completed. Keep provider authentication secrets out of public source code.

Prepare a portfolio demonstration

Explain the project scope, API source and known limitations in your README. Show a successful journey and at least one error state. Include accessible labels, keyboard navigation and responsive layouts. Describe the decisions you made around state, request modelling and error handling. This makes the project useful for an interview discussion without claiming production reliability for a practice service.

Next steps

Browse REST API project documentation or read another frontend project guide.