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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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
After completing the validation implementation
verify:
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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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Creative
PromptBeginner5 minmarkdown
- Validate cross-field dependencies (end date after start date
shipping address matches country)
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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
- Check for malicious patterns: excessively nested JSON
zip bombs
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General
PromptBeginner5 minmarkdown
- Sanitize file names to remove path traversal sequences (../
%2e%2e/) and special characters
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Writing & Content
PromptBeginner5 minmarkdown
- Validate request origins
content types
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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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General
PromptBeginner5 minmarkdown
- Validate and sanitize file uploads for type (magic bytes
not just extension)
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Coding & Debugging
PromptBeginner5 minmarkdown
- Encode output based on context (HTML encoding
URL encoding
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General
PromptBeginner5 minmarkdown
- Normalize whitespace
trim leading/trailing spaces
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General
PromptBeginner5 minmarkdown
- **Schema validation**: JSON Schema
Zod
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General
PromptBeginner5 minmarkdown
- Map validation rules to the appropriate layer (client
server
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General
PromptBeginner5 minmarkdown
- Assess security threat model (injection vectors
abuse scenarios
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Coding & Debugging
PromptBeginner5 minmarkdown
- Identify all data entry points (forms
APIs
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General
PromptBeginner5 minmarkdown
- **Optimize validation performance** using fail-fast ordering
caching for expensive checks
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