typescript-security
Validate input, secure auth tokens, and prevent injection attacks in TypeScript. Use when validating input, handling auth tokens, sanitizing data, or managing secrets and sensitive configuration.
What this skill does
# TypeScript Security
## **Priority: P0 (CRITICAL)**
## Validate Input at Boundaries
- Use **`Zod`**, **`Joi`**, or **`class-validator`** at **API boundary**. Always **`parse`** and validate **`user-controlled input`** before using. Use **`safeParse`** for error handling without throwing. Return **`400 with structured errors`** on failure.
See [references/REFERENCE.md](references/REFERENCE.md) for Zod validation schemas, secure cookie setup, and JWT auth patterns.
## Prevent Injection and XSS
- **Sanitization**: Use **`DOMPurify`** for HTML sanitization to prevent **Cross-Site Scripting (XSS)**.
- **SQL Injection**: Use **Parameterized Queries** (e.g., **`pool.query('... WHERE id = $1', [id])`**) or **Type-safe ORMs** (**`Prisma`**/`TypeORM`). Use **`Prisma.sql`** for raw queries.
- **Input Filtering**: Sanitize **`user-controlled input`** before using it in file paths or OS commands (Command Injection).
## Secure Authentication
- Use **`Argon2id`** for password hashing. Implement **`JWT`** (via **`jsonwebtoken`** or **`jose`**) with **`HttpOnly`** and **`Secure`** cookies. Use **`RS256`** for public/private key pairs and implement **`Refresh Token rotation`**.
- **Secrets**: Store secrets in **`.env`** (e.g., **`JWT_SECRET`**) or **Secret Managers**. NEVER commit them to Git.
- **CORS**: Configure **`CORS`** with **Strict Origin Whitelisting**. Avoid `origin: '*'`.
- **Encryption**: Use **`crypto`** (Node.js) or **`Web Crypto API`** for sensitive data. Avoid legacy algorithms like MD5/SHA1.
## Verification
After typing validation schemas (Zod/joi) or auth guards, call `getDiagnostics` (typescript-lsp) to confirm type narrowing correct before finalizing.
## Anti-Patterns
- **No dynamic execution**: Avoid `eval`, `Function` constructor, or string literals as timer callbacks — all execute runtime code and bypass TypeScript's type system.
- **No shell string interpolation**: Never use `execSync(\`cmd ${userInput}\`)`or interpolate environment variables / config values into`execSync`/`spawnSync`strings. Shell metacharacters cause **command injection (OWASP A03)**. Use`execFileSync('git', ['arg1', arg2])` with a static command + separate args array instead.
- **No unvalidated SSRF origins**: When a URL comes from env vars or config (e.g., `FEEDBACK_API_URL`), validate it against an allowed-origin allowlist before calling `fetch()` / `axios`.
- **No Plaintext**: Never commit secrets.
- **No Trust**: Validate everything server-side.
## References
See [references/REFERENCE.md](references/REFERENCE.md) for Zod validation, secure cookie setup, JWT auth, security headers, and RBAC patterns.
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