securing-nodejs-apps
Hardens Node.js HTTP services: input validation, secure headers, authentication/authorization basics, secret handling, and dependency hygiene. Use when shipping to production or reviewing a service for security gaps.
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- 2026年5月3日 03:46
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- securing-nodejs-apps
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- Hardens Node.js HTTP services: input validation, secure headers, authentication/authorization basics, secret handling, and dependency hygiene. Use when shipping to production or reviewing a service for security gaps.
# Securing Node.js Apps
## When to use
- Shipping a service to production
- Reviewing a service for security gaps
- Adding authentication/authorization
- Handling secrets properly
## Core rules
1. Input validation on all external boundaries (class-validator or Zod)
2. Secure headers: Helmet or equivalent
3. Secrets in env vars, never in code or logs
4. Authentication/authorization as ports, not hardcoded
5. Dependency hygiene: `npm audit`, no known vulnerabilities
6. Rate limiting on public endpoints
## Reference shape (TypeScript)
### Input Validation (Zod)
```typescript
import { z } from 'zod';
export const CreateUserSchema = z.object({
email: z.string().email().toLowerCase(),
password: z.string().min(12),
name: z.string().min(2).max(100),
});
export type CreateUserDto = z.infer<typeof CreateUserSchema>;
```
### Secret Handling
```typescript
// ❌ Never
const jwtSecret = 'my-secret';
// ✅ Always
import { config } from '@shared/config';
const jwtSecret = config.JWT_SECRET; // Loaded once, validated
```
## Examples — Do
```typescript
// Validate input at boundary
const parsed = CreateUserSchema.safeParse(req.body);
if (!parsed.success) return res.status(400).json({ errors: parsed.error.format() });
```
## Examples — Don't
```typescript
// ❌ No validation
app.post('/user', (req, res) => { db.save(req.body); });
// ❌ Secret in code
const apiKey = 'sk_live_12345';
```
## Checklist
- [ ] Input validation on all boundaries
- [ ] Secure headers (Helmet)
- [ ] Secrets in env vars only
- [ ] Auth as injectable port
- [ ] Rate limiting configured
- [ ] `npm audit` passes
See [reference/security-patterns.md](./reference/security-patterns.md) for full patterns.
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