The problem they solve
On a high level, both Falcor and GraphQL were designed to solve the same problem — managing the increasingly complex data requirements of modern web/mobile apps.
The best practice for web development has changed significantly over the last few years. While just a few years ago most websites used to be rendered on the server and have only relatively little client-side logic, the opposite is true of new apps today. Single-page applications and clients that implement complex logic are the new reality.
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