react

Common React/Next.js errors with diagnosis and solutions.

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Development
5

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Content

# React Error Patterns

Common React/Next.js errors with diagnosis and solutions.

## Hydration Errors

### Hydration Mismatch

```
Hydration failed because the initial UI does not match what was rendered on the server.
```

**Causes**:
1. Server and client render different content
2. Using browser-only APIs during render
3. Date/time formatting differences
4. Random values in render

**Common Culprits**:
```jsx
// These cause hydration mismatch
{new Date().toLocaleString()}     // Time differs
{Math.random()}                    // Random differs
{typeof window !== 'undefined'}   // Condition 

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