How to Build a Client-Side Calorie Tracker Using DietlyAPI and LocalStorage

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Developers can build a functional calorie-tracking web app in a single HTML file using DietlyAPI and the browser's localStorage, requiring no server or build process. The app features a food search powered by the API's GET /search endpoint, a daily log where users can adjust gram amounts, and a running calorie and protein total calculated using a per-100g formula. Food entries store a snapshot of nutritional data at the time of logging, ensuring past records remain accurate even if the API catalog is later updated. The guide also covers edge cases such as handling 429 rate-limit responses, empty search results, and deleted food records gracefully. Since the read endpoint is public, no private API key is exposed, making the app safe to deploy as a fully client-side project.

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