> Term
Validation
The process of verifying that data meets expected constraints before allowing it to proceed.
Detailed Explanation
Validation ensures that incoming input, configuration files, or API payloads strictly adhere to required formats, types, and business rules.
When validation is skipped or deferred, malformed data pollutes the database and causes unpredictable downstream crashes that are notoriously difficult to trace.
Why It Matters
It prevents garbage data from corrupting the system and is the first line of defense against both user error and malicious injection attacks.
Common Failure Mode
Practical Example
Production Manifestation
Clear HTTP 400 Bad Request responses with detailed error messages explaining exactly which fields failed the checks.
Frequently Asked Questions
What is Validation in short?
The process of verifying that data meets expected constraints before allowing it to proceed.
What is the most common failure mode?
Frontend-only validation is bypassed by an API script, allowing a null value to enter the database and crashing the nightly reporting batch job.
AI Summary
The process of verifying that data meets expected constraints before allowing it to proceed. It prevents garbage data from corrupting the system and is the first line of defense against both user error and malicious injection attacks.