tsconfig Validator Playground

How to use the result in practice

Start by selecting the closest preset to the codebase under review. Browser app is useful for Vite, Angular, webpack and other bundler workflows. Library package highlights declaration output and stricter public contracts. Node service or CLI keeps module and moduleResolution aligned with NodeNext behavior. React adds the automatic JSX runtime expectation. Strict hardening surfaces a tighter safety set for teams that are deliberately raising their TypeScript bar. After running the validator, read the summary score as a prioritization signal rather than a certification badge. Errors mean the file cannot be evaluated as a tsconfig-like object. Warnings point to changes that commonly create production or maintenance risk, such as strict: false, an older target or mismatched NodeNext resolution. Info diagnostics are not failures. They record decisions that reviewers should not miss: extends is present but not resolved, paths need bundler or runtime alignment, skipLibCheck trades speed for less declaration checking, and CommonJS-heavy projects may need an explicit interop decision. The recommended snippet is deliberately conservative. It merges the selected preset's expected compilerOptions into the pasted config and leaves other fields visible. The playground does not rewrite repository files, infer monorepo project references or pretend to know inherited options from an extends chain. That boundary matters because a trustworthy public tool should not imply filesystem knowledge it does not have. If the repository uses a shared base config, project references, custom build tooling or type-aware linting, treat this page as the first review pass and confirm the final behavior inside the repository. The publisher content is part of the utility. A visitor arriving from search can understand why JSONC support matters for real tsconfig files, why moduleResolution differs between Bundler and NodeNext, why paths/baseUrl need runtime alignment and why skipLibCheck is an explicit tradeoff. The page also connects naturally to the rest of Playground Forge: TypeScript AST Viewer for syntax structure, typescript-eslint Parser for lint parser context, ESLint Rule Tester for rules, Prettier Config for formatting and JSON Schema Validator for adjacent configuration contracts. A good tsconfig review also records which surface is being protected. Application teams usually care about fast feedback in the editor, predictable bundler output and fewer runtime surprises. Library teams care about public declaration files, package consumers and compatibility with downstream build tools. Node teams care about ESM and CommonJS boundaries, package exports and resolution behavior that matches production. React teams care about JSX runtime, isolated module constraints and code generation that matches the framework pipeline. The same option can be harmless in one surface and risky in another, so the preset selector is a conversation starter rather than a universal authority. Treat the result as a compact decision log: what changed, why it matters, which preset it was compared against and which repository command must prove the final behavior. The page intentionally names the options that reviewers search for: strict, noImplicitAny, target, module, moduleResolution, jsx, allowJs, checkJs, baseUrl, paths, skipLibCheck, esModuleInterop, declaration, declarationMap, noUncheckedIndexedAccess and exactOptionalPropertyTypes. Naming them in one place helps a team compare config pull requests without opening several handbook pages during every review. It also keeps the AdSense and SEO surface useful before interaction because the route answers a real developer question: what does this tsconfig choice mean for my project boundary?