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Cascade Modified API Response Contract
API clients break because Cascade changed the response format of endpoints. Clients expect certain JSON fields that are no longer present, or field names changed. This breaks mobile apps, frontend, and third-party integrations.
Cascade likely simplified or reorganized response objects without considering backward compatibility.
Error Messages You Might See
TypeError: Cannot read property 'userId' of undefined
JSON.parse error: unexpected token
Field not found in response
API contract violation
Common Causes
- Cascade removed fields from DTO without deprecation period
- Renamed response fields (userId to user_id) breaking client parsing
- Changed response wrapping structure (data vs response vs result)
- Changed array response to single object or vice versa
How to Fix It
Create new endpoint version for changed contracts (e.g., /api/v2/endpoint). Add deprecated annotations to old endpoint with migration guide. Keep old response format available during transition period. Document breaking changes in API changelog. Consider using versioning headers if clients support it.
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Get HelpFrequently Asked Questions
How do I version APIs?
Use URL path versioning (/v1/, /v2/) or accept header versioning. Maintain multiple versions during transition.
How long should I support old API versions?
Typically 6-12 months. Communicate timeline to clients. Provide migration guide to new version.