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66 lines
2.0 KiB
Markdown
66 lines
2.0 KiB
Markdown
---
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title: Avoid Duplicate Serialization in RSC Props
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impact: LOW
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impactDescription: reduces network payload by avoiding duplicate serialization
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tags: server, rsc, serialization, props, client-components
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---
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## Avoid Duplicate Serialization in RSC Props
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**Impact: LOW (reduces network payload by avoiding duplicate serialization)**
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RSC→client serialization deduplicates by object reference, not value. Same reference = serialized once; new reference = serialized again. Do transformations (`.toSorted()`, `.filter()`, `.map()`) in client, not server.
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**Incorrect (duplicates array):**
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```tsx
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// RSC: sends 6 strings (2 arrays × 3 items)
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<ClientList usernames={usernames} usernamesOrdered={usernames.toSorted()} />
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```
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**Correct (sends 3 strings):**
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```tsx
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// RSC: send once
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<ClientList usernames={usernames} />
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// Client: transform there
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'use client'
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const sorted = useMemo(() => [...usernames].sort(), [usernames])
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```
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**Nested deduplication behavior:**
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Deduplication works recursively. Impact varies by data type:
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- `string[]`, `number[]`, `boolean[]`: **HIGH impact** - array + all primitives fully duplicated
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- `object[]`: **LOW impact** - array duplicated, but nested objects deduplicated by reference
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```tsx
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// string[] - duplicates everything
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usernames={['a','b']} sorted={usernames.toSorted()} // sends 4 strings
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// object[] - duplicates array structure only
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users={[{id:1},{id:2}]} sorted={users.toSorted()} // sends 2 arrays + 2 unique objects (not 4)
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```
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**Operations breaking deduplication (create new references):**
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- Arrays: `.toSorted()`, `.filter()`, `.map()`, `.slice()`, `[...arr]`
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- Objects: `{...obj}`, `Object.assign()`, `structuredClone()`, `JSON.parse(JSON.stringify())`
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**More examples:**
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```tsx
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// ❌ Bad
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<C users={users} active={users.filter(u => u.active)} />
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<C product={product} productName={product.name} />
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// ✅ Good
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<C users={users} />
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<C product={product} />
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// Do filtering/destructuring in client
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```
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**Exception:** Pass derived data when transformation is expensive or client doesn't need original.
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