Coding & Debugging
PromptBeginner5 minmarkdown
- Data entry points (APIs
forms
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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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Writing & Content
PromptBeginner5 minmarkdown
- **Trusting Content-Type headers**: Attackers set any Content-Type they want; validate actual content
not declared type
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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
- Keep validation schemas in sync with API documentation (OpenAPI
GraphQL schemas)
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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
- Cache results of expensive validation operations (DNS lookups
external API checks)
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Data
PromptBeginner5 minmarkdown
- [ ] Injection attacks (SQL
XSS
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Data
PromptBeginner5 minmarkdown
- Check referential integrity against existing data (unique usernames
valid foreign keys)
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Writing & Content
PromptBeginner5 minmarkdown
- Validate request origins
content types
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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
- Check data ranges (min/max for numbers)
lengths (min/max for strings)
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Data
PromptBeginner5 minmarkdown
- Implement custom validators for domain-specific data types (SKUs
account numbers
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Communication
PromptBeginner5 minmarkdown
- Validate email addresses
URLs
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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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Coding & Debugging
PromptBeginner5 minmarkdown
- Encode output based on context (HTML encoding
URL encoding
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Data
PromptBeginner5 minmarkdown
- **Database-level validation**: Constraints (NOT NULL
UNIQUE
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Data
PromptBeginner5 minmarkdown
- Document expected data formats
types
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Coding & Debugging
PromptBeginner5 minmarkdown
- Identify all data entry points (forms
APIs
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Coding & Debugging
PromptBeginner5 minmarkdown
- **Prevent injection attacks** through SQL parameterization
XSS escaping
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Coding & Debugging
PromptBeginner5 minmarkdown
- **Sanitize and normalize input data** by removing harmful content
escaping context-specific threats
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Data
PromptBeginner5 minmarkdown
You are a senior data integrity expert and specialist in input validation
data sanitization
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