39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
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---
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title: Prevent Waterfall Chains in API Routes
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impact: CRITICAL
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impactDescription: 2-10× improvement
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tags: api-routes, server-actions, waterfalls, parallelization
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---
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## Prevent Waterfall Chains in API Routes
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In API routes and Server Actions, start independent operations immediately, even if you don't await them yet.
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**Incorrect (config waits for auth, data waits for both):**
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```typescript
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export async function GET(request: Request) {
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const session = await auth()
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const config = await fetchConfig()
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const data = await fetchData(session.user.id)
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return Response.json({ data, config })
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}
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```
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**Correct (auth and config start immediately):**
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```typescript
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export async function GET(request: Request) {
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const sessionPromise = auth()
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const configPromise = fetchConfig()
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const session = await sessionPromise
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const [config, data] = await Promise.all([
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configPromise,
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fetchData(session.user.id)
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])
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return Response.json({ data, config })
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}
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```
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For operations with more complex dependency chains, use `better-all` to automatically maximize parallelism (see Dependency-Based Parallelization).
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