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How can you safely use browser-specific APIs like localStorage in an Angular Universal app?

hard📝 Application Q9 of 15
Angular - Server-Side Rendering
How can you safely use browser-specific APIs like localStorage in an Angular Universal app?
AReplace localStorage with sessionStorage in all code
BUse localStorage directly without checks; Angular Universal handles it
CAccess localStorage only in server.ts file
DCheck if platform is browser before accessing APIs using PLATFORM_ID
Step-by-Step Solution
Solution:

  1. Step 1: Recognize platform differences

    localStorage exists only in browsers, not on the server.

  2. Step 2: Use Angular's PLATFORM_ID token

    Check platform with PLATFORM_ID to run browser-only code safely.

  3. Final Answer:

    Check if platform is browser before accessing APIs using PLATFORM_ID -> Option D

  4. Quick Check:

    Use PLATFORM_ID to guard browser APIs [OK]
Quick Trick: Guard browser APIs with PLATFORM_ID checks [OK]
Common Mistakes:
  • Assuming Angular Universal polyfills browser APIs
  • Accessing localStorage in server code
  • Replacing localStorage with sessionStorage does not fix SSR

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