General
PromptBeginner5 minmarkdown
- Use established validation libraries (Zod
Joi
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General
PromptBeginner5 minmarkdown
- Never trust any input regardless of source
including internal services
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General
PromptBeginner5 minmarkdown
- [ ] File uploads validated for type (magic bytes)
size limits
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Data
PromptBeginner5 minmarkdown
- [ ] Injection attacks (SQL
XSS
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General
PromptBeginner5 minmarkdown
- [ ] Validation is implemented at all layers (client
server
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General
PromptBeginner5 minmarkdown
After completing the validation implementation
verify:
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General
PromptBeginner5 minmarkdown
- Unit tests cover every validation rule with valid
invalid
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General
PromptBeginner5 minmarkdown
- Enum values validated against an explicit allowlist
not a blocklist
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General
PromptBeginner5 minmarkdown
- No system internals
stack traces
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General
PromptBeginner5 minmarkdown
- Implement temporal validation (expired tokens
past dates
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Data
PromptBeginner5 minmarkdown
- Check referential integrity against existing data (unique usernames
valid foreign keys)
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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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Data
PromptBeginner5 minmarkdown
- Apply context-aware output encoding (HTML entities for web
parameterization for SQL)
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Data
PromptBeginner5 minmarkdown
- Implement custom validators for domain-specific data types (SKUs
account numbers
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General
PromptBeginner5 minmarkdown
- Validate complex structures (JSON
XML
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Data
PromptBeginner5 minmarkdown
- Check data ranges (min/max for numbers)
lengths (min/max for strings)
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Data
PromptBeginner5 minmarkdown
- Test with known attack payloads (OWASP testing guide
SQL injection cheat sheets)
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Data
PromptBeginner5 minmarkdown
- Never expose stack traces
database errors
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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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General
PromptBeginner5 minmarkdown
- Validate and sanitize file uploads for type (magic bytes
not just extension)
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General
PromptBeginner5 minmarkdown
- Normalize whitespace
trim leading/trailing spaces
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