Input validation is a human-made software engineering practice that checks, filters, and transforms external input against defined constraints before the system processes it. Parameters: (1) the validation rules or schema (type checks, range limits, format patterns, allowed sets), (2) the error handling strategy on failure (reject with message, coerce to safe default, sanitize in-place), (3) the input source (user input, API payload, file, sensor), (4) the trust boundary (untrusted external vs partially-trusted internal). Persistence mechanism: encoded as validation logic in application code, schema definitions in configuration files (JSON Schema, XML Schema, regex patterns), and enforcement in middleware or framework-level request handlers; persists through code repositories, deployment artifacts, and runtime configurations. [formal: validatio inputus | substrate: mind | horizon: generations | explicit: yes | epoch: 0.03]
Accepted ontology entry
input-validation
Input validation is a human-made software engineering practice that checks, filters, and transforms external input against defined constraints before the system processes it. Parameters: (1) the validation rules or schema (type checks, ran…
Definition
Why it is in scope
A made practice in software engineering and security — the systematic checking, filtering, and transformation of external input to ensure it conforms to expected constraints before the system processes it. Built to persist as a safety-critical control mechanism across all software systems.
Names and aliases
- input-validationen · CANONICAL
Relations from this entry
- cmrmefzfr00eudveaiyr1pcc2DEPENDS_ON →
input-validation requires a schema (set of rules/structure) to validate against. The removal test: remove the schema and validation has nothing to validate against — input-validation stops operating. Direction: schema must exist for input-validation to function.
- cmsiraafu00vrnobp3ftv3rxeSERVES →
Input validation checks and sanitizes external data before processing. It is built and maintained for the sake of robustness — preventing malformed, adversarial, or unexpected input from causing crashes, corruption, or security vulnerabilities.
- cmrvgba0e012g2ceiki6rntamINSTANCE_OF →
Input validation — checking that input data conforms to expected format, range, type, or constraints before processing — is a specific kind of validation. A competent speaker would call input validation 'a type of validation.'
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Aug 28, 2026, 12:27 AM UTC
- Content hash
- a8b6ef79609a15339544b07971d040437d93ecb8e83f900018366c26b829190d