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# Runtime Selection
## Use Node.js Runtime by Default
Use the default Node.js runtime for new routes and pages. Only use Edge runtime if the project already uses it or there's a specific requirement.
```tsx
// Good: Default - no runtime config needed (uses Node.js)
export default function Page() { ... }
// Caution: Only if already used in project or specifically required
export const runtime = 'edge'
```
## When to Use Each
### Node.js Runtime (Default)
- Full Node.js API support
- File system access (`fs`)
- Full `crypto` support
- Database connections
- Most npm packages work
### Edge Runtime
- Only for specific edge-location latency requirements
- Limited API (no `fs`, limited `crypto`)
- Smaller cold start
- Geographic distribution needs
## Detection
**Before adding `runtime = 'edge'`**, check:
1. Does the project already use Edge runtime?
2. Is there a specific latency requirement?
3. Are all dependencies Edge-compatible?
If unsure, use Node.js runtime.