Give Components Clear Roles

Organize interface code around the tasks each view performs and the data it owns. A component’s responsibility should be clear before state changes and service calls are connected.

Use the browser’s <button> for user actions, <form> for submitted inputs and <a> for application navigation. Keep <div> groupings focused on presentation while JavaScript handles the behavior required by each task.

Make State Changes Understandable

Plan how the interface responds to user input, pending requests and server results. Keep temporary view state local and coordinate shared records where multiple screens need them.

Preserve clear labels, keyboard access and useful status messages as JavaScript updates the page. Check that loading, validation and failure states remain understandable during interaction.

Define the Server Workflow

Connect browser requests to service logic, record validation and database access through documented API contracts. Treat data from external systems as input that needs checking.

Handle asynchronous operations, request failures and background tasks explicitly. Keep credentials out of browser bundles and apply access checks where the server reads or changes protected records.

Review the Complete Task

Test the path from the user’s action through the service response and back to the interface. For instance, a <form> needs checks for accepted data, rejected input and an unavailable backend, rather than a click handler alone.