40 React Interview Questions and Answers (2026 Edition)
40 React interview questions covering Hooks, Server Components, Actions, the React Compiler, and React 19.2 features like useEffectEvent and Activity. Updated for 2026.
42 min readZeeshan Tofiq
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Dev Encyclopedia covers web, mobile, DevOps, databases, and troubleshooting. Written for developers who need clear answers, not fluff.
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What Dev Encyclopedia is
Dev Encyclopedia is an independent publication for working software developers. It covers the problems that show up in real projects: a build that breaks after a major version bump, a database policy that passes review and still leaks rows, a dependency that runs a script you never read.
Every guide is written against a real project rather than paraphrased from documentation. Commands are run, configs are applied, and error messages are reproduced before they are published. Where a recommendation is a judgement call rather than a documented fact, the article says so and explains the trade-off instead of presenting one option as the only answer.
Alongside the articles there are 52 free browser-based developer tools. They run entirely in your browser, need no account, and send nothing to a server. Each one ships with a written explanation of what it does and where it falls short, so the tool is useful even before you paste anything into it.
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TypeStripCheck
Node.js Type-Stripping Compatibility Scanner
Paste your TypeScript and find every enum, namespace, parameter property, and import-equals declaration that throws ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX under Node's strip-only type stripping, each with the line number and the erasable rewrite. Runs entirely in your browser.
typescript type stripping checkererasableSyntaxOnly checkerERR_UNSUPPORTED_TYPESCRIPT_SYNTAXnode experimental-transform-types removed
database
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RLSBuilder
PostgreSQL Row-Level Security Policy & Jest Test Generator
Enter a table name and tenant column, get the exact CREATE POLICY SQL for SELECT/INSERT/UPDATE/DELETE and a matching Jest test file that proves tenant isolation actually works. No signup, nothing leaves your browser.
postgres row level security generatorrls policy generatorcreate policy postgresql generatormulti-tenant postgres policy sql
database
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MongooseTS
Free Mongoose Schema to TypeScript Interface Generator
Paste a Mongoose schema and get the matching TypeScript interface back instantly, either as a plain hand-writable interface or the InferSchemaType style Mongoose recommends today. Handles required fields, nested subdocuments, arrays, refs, and enums. No install, runs entirely in your browser.
mongoose typescript interface generatormongoose schema to typescripttypescript interface from mongoose schemaInferSchemaType generator
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Who writes this
Zeeshan Tofiq
Full Stack Developer
Full stack developer with over 6 years of experience building production applications. Writes practical guides on JavaScript, TypeScript, React, Node.js, and cloud infrastructure. Focused on helping developers solve real problems with clean, maintainable code.
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