tsconfig.json Generator

It builds a ready-to-paste tsconfig.json from a preset plus a few toggles. Choose a target scenario (a strict app, a Node library, a monorepo package, or a bundler-driven project), flip the options you care about, and copy the JSON. Everything runs in your browser, so nothing is sent anywhere.

Use "Strict app" for most application code, since it turns on every strictness flag and catches the most bugs. Pick "Node library" when you publish a package that emits its own JavaScript and type declarations. Use "Monorepo package" for composite projects with project references, and "Bundler" when a tool like Vite or esbuild does the emit and TypeScript only type-checks.

Because array and record lookups can return undefined, and the default TypeScript settings pretend they never do. noUncheckedIndexedAccess makes arr[i] typed as T | undefined, which forces you to handle the missing case. It is stricter than the base strict flag and catches a whole class of runtime crashes, so the app preset opts you in.

Use NodeNext (with moduleResolution NodeNext) when Node runs your output directly, because it honors package.json exports and the ESM/CJS rules Node enforces. Use the Bundler resolution when Vite, esbuild, or a similar tool resolves your imports, since it relaxes the extension rules a bundler already handles for you.