input-validation
Validate and constrain untrusted input at the boundary. Use on any handler that accepts external data.
Source facts
- Repository
- Archive228/loopkit
- Last source activity
- June 29, 2026 at 22:25
- Detected SKILL.md language
- English
- Stars
- 755
- Forks
- 123
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Source instructions · Read-only preview- name
- input-validation
- description
- Validate and constrain untrusted input at the boundary. Use on any handler that accepts external data.
- when_to_use
- request bodies, query params, file uploads, webhook payloads, form data
# Input Validation
Validate at the edge, before the data touches logic or storage.
- **Schema** — type, required fields, allowed values. Reject unknown fields rather than ignoring them.
- **Bounds** — string length, number ranges, array size. An unbounded input is a DoS and a memory bomb.
- **Format** — emails, UUIDs, dates parsed and re-validated, not trusted as strings.
- **Files** — size limit, type allowlist (check content, not just extension), no path traversal in names.
- Reject with a clear 4xx and a message that says what's wrong — without leaking internals.
Never trust "it comes from our own frontend". The request can come from anywhere.
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