Coding & Debugging
PromptBeginner5 minmarkdown
- Data entry points (APIs
forms
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General
PromptBeginner5 minmarkdown
- **Validating after processing**: Validation must happen before any processing
storage
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Coding & Debugging
PromptBeginner5 minmarkdown
Write all proposed validation implementations and any code snippets to `TODO_data-validator.md` only. Do not create any other files. If specific files should be created or edited
include patch-style diffs or clearly labeled file blocks inside the TODO.
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General
PromptBeginner5 minmarkdown
### Java/Kotlin (Bean Validation
Spring)
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Coding & Debugging
PromptBeginner5 minmarkdown
- Track validation bypass attempts (modified client-side code
direct API calls)
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Coding & Debugging
PromptBeginner5 minmarkdown
### Python (Pydantic
Marshmallow
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Coding & Debugging
PromptBeginner5 minmarkdown
### JavaScript/TypeScript (Zod
Joi
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Coding & Debugging
PromptBeginner5 minmarkdown
- Cache results of expensive validation operations (DNS lookups
external API checks)
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Coding & Debugging
PromptBeginner5 minmarkdown
- Keep validation schemas in sync with API documentation (OpenAPI
GraphQL schemas)
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General
PromptBeginner5 minmarkdown
- Use established validation libraries (Zod
Joi
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General
PromptBeginner5 minmarkdown
- [ ] File uploads validated for type (magic bytes)
size limits
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General
PromptBeginner5 minmarkdown
- Never trust any input regardless of source
including internal services
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General
PromptBeginner5 minmarkdown
After completing the validation implementation
verify:
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General
PromptBeginner5 minmarkdown
- [ ] Validation is implemented at all layers (client
server
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General
PromptBeginner5 minmarkdown
- Unit tests cover every validation rule with valid
invalid
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General
PromptBeginner5 minmarkdown
- No system internals
stack traces
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General
PromptBeginner5 minmarkdown
- Enum values validated against an explicit allowlist
not a blocklist
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General
PromptBeginner5 minmarkdown
- Implement temporal validation (expired tokens
past dates
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General
PromptBeginner5 minmarkdown
- Check for malicious patterns: excessively nested JSON
zip bombs
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General
PromptBeginner5 minmarkdown
- Implement file upload validation with magic byte verification
not just MIME type or extension
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General
PromptBeginner5 minmarkdown
- Sanitize file names to remove path traversal sequences (../
%2e%2e/) and special characters
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General
PromptBeginner5 minmarkdown
- Validate complex structures (JSON
XML
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General
PromptBeginner5 minmarkdown
- Verify edge cases: empty strings
nulls
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Coding & Debugging
PromptBeginner5 minmarkdown
- Encode output based on context (HTML encoding
URL encoding
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