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---
name: async-api-routes
description: Prevent Waterfall Chains in API Routes. Use when you need help with async api routes.
license: CC-BY-NC-SA-4.0
metadata:
risk: unknown
source: community
kind: mode
category: rules
---
## Prevent Waterfall Chains in API Routes
In API routes and Server Actions, start independent operations immediately, even if you don't await them yet.
**Incorrect (config waits for auth, data waits for both):**
```typescript
export async function GET(request: Request) {
const session = await auth();
const config = await fetchConfig();
const data = await fetchData(session.user.id);
return Response.json({ data, config });
}
```
**Correct (auth and config start immediately):**
```typescript
export async function GET(request: Request) {
const sessionPromise = auth();
const configPromise = fetchConfig();
const session = await sessionPromise;
const [config, data] = await Promise.all([configPromise, fetchData(session.user.id)]);
return Response.json({ data, config });
}
```
For operations with more complex dependency chains, use `better-all` to automatically maximize parallelism (see Dependency-Based Parallelization).
