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A senior frontend developer at Palantir shares 29 common React codebase anti-patterns to watch for. The list covers dependency management (unnecessary libraries, heavy bundles), code organization (chaotic folder structure, junk drawer utils, barrel files), component design (god components, passing whole objects as props), state management mistakes (derived values in state, overusing global store, massive contexts), TypeScript hygiene, hooks misuse, data fetching pitfalls, error handling gaps, rendering issues (array index keys, broken memoization, nested ternaries), and maintainability problems (magic values, scattered conditionals, no abstraction over third-party libs). Each flag includes a concrete code example and a clear fix.

29 React Codebase Red Flags from a Senior Frontend Developer

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29 React Codebase Red Flags from a Senior Frontend Developer

Many of them can be related to any JS project :)

The only red flag there, “works at Palantir”, disqualifies everything you say, even if you are correct