Flutter Developer Shares Battle-Tested 5-File API Architecture Using Dio

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A Flutter developer with experience shipping over a dozen production apps has published a detailed guide on structuring API integration using just five files. The architecture relies on the Dio HTTP client and covers a centralised client setup, an auth interceptor, retry logic, caching, and typed repositories. The auth interceptor automatically attaches access tokens to requests and handles silent token refresh on 401 errors, preventing users from seeing authentication failures. A single Dio instance manages base URLs, timeouts, and interceptors across the entire app, eliminating scattered network calls in individual screens. The pattern was developed after a painful refactor of an early app whose unstructured API layer took a full week to fix.

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