Unresolved promises may be due to unhandled errors or incorrect usage. Check promise syntax and ensure all branches resolve or reject properly.

Promises are essential for handling asynchronous tasks in JavaScript, but unhandled or incorrectly chained promises can cause issues. Start by confirming that every promise has a resolve or reject outcome, handling errors within .catch() blocks. Common errors include mismatched async/await syntax or missing return statements in promise chains. Ensure functions return promises where expected and handle errors gracefully. For complex flows, use async/await with try-catch to improve readability. Additionally, watch for inadvertent synchronous behavior in promise chains, which can prevent proper resolution. Debugging tools like Chrome DevTools assist with identifying promise states.