Common Bugs in Aider-Generated Code

Aider's strength (targeted, focused changes) is also its limitation — it doesn't always see the full picture of how changes in one file affect others

Aider's file-by-file approach causes cross-file inconsistencies. Function signatures change in the definition but not all call sites. Security measures added to one route but not similar routes. Type definitions updated in one file but imports in other files reference the old shape

Start by running your app through its complete user flow — sign up, use every feature, try edge cases like empty inputs and invalid data. Most Aider bugs surface when you go off the happy path. Use your browser's developer tools to watch for console errors, failed network requests, and unhandled promise rejections. TypeScript's strict mode will catch many issues at compile time if it's not already enabled.

For async errors, wrap every server-side operation in try/catch blocks and return meaningful error messages. For state bugs, consider whether the state belongs in the URL, in a server component, or in client state — Aider often defaults to client state when server state would be more appropriate. For data fetching issues, implement proper loading and error states for every data-dependent component.

The best way to prevent Aider bugs from reaching production: enable TypeScript strict mode, add ESLint rules for common mistakes (no-floating-promises, exhaustive-deps), and write tests for critical user flows. Even basic smoke tests catch the majority of issues.