How would you design a JS solution to efficiently fetch and read feature flags from an API, ensuring optimal performance and caching?

Question

Anonymous · Accepted Answer

To optimize performance, we can save feature flags in local storage. We can also
set caching headers on the request itself. The key is to make it expire
relatively quick (e.g. within the hour) as these are feature flags where some
might be gated based on either permissions, payment, etc. We can also implement
a strategy where we update the local storage values post page load so that the
request is not blocking

How would you design a JS solution to efficiently fetch and read feature flags from an API, ensuring optimal performance and caching?

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