Docs · Validators

`uuid` validator

RFC 4122 UUID v1–v5, lowercase or uppercase.

One of 19 validator types · pure compute, no AI cost

Reference

Format

Matches `/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i` — hyphenated 36 chars, version nibble 1–5, variant nibble 8/9/a/b.

Examples

550e8400-e29b-41d4-a716-446655440000
f47ac10b-58cc-4372-a567-0e02b2c3d479
invalid: bare hex (no hyphens) is rejected

How it runs

Implementation

A faithful summary of lib/validators.ts. Validators are pure functions and run identically in the Worker, the Workbench and the MCP server — one implementation, so the three cannot disagree about whether a value is valid.

lib/validators.ts

function validUuid(value) {
  return /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
    .test(value)
    ? OK
    : fail('uuid_invalid', 'not a UUID')
}

Config

Use in a template

Validators attach to a field on a custom template. The cascade runs them after mapping but before commit; failures surface in the per-row validation report.

template.yaml

fields:
  - column: external_id
    type: string
    validators:
      - type: uuid

Watch out

Common gotchas

Version 6, 7, 8 UUIDs are rejected — the version nibble must be 1–5. If you emit UUIDv7, validate with a custom regex.
Unhyphenated 32-hex form is rejected. Insert hyphens in your transform.
NIL UUID `00000000-0000-0000-0000-000000000000` fails because the version nibble is `0`.

Where it runs

Three routes, no AI cost.

POST/v1/validate-rowValidate one row against a template. Stateless, no key, pure compute — the fastest way to try uuid against a real value.no key
POST/v1/uploads/:id/validateRun every field validator over the parsed upload, without committing. Returns errors and warnings per row.read
POST/v1/uploads/:id/commitValidates on the way out. skip_invalid_rows drops the failures instead of failing the commit.commit

Validators are pure functions, so they add nothing to the AI bill. Every map draws a small flat per-map fee from your prepaid token wallet ($10 minimum, shared across the phi-cloud suite); only columns that reach the metered LLM layer, plus any-to-any convert and structural reshape, bill real AI tokens. See pricing

Catalogue

Related templates

No template in the default catalogue ships with uuid preconfigured. Use it on a custom template via the YAML snippet above, or through the template editor.

Explore

All 19 validator types

The complete list a template field can declare. There is no SNOMED validator — it required an affiliate licence, no template used it, and it was removed in 2026.

Back to the documentation index or browse the template catalogue.

Ready when you are

Validate every row — before it lands.

Attach checksum-strict validators to any field, and gate risky commits behind the requires_hitl flag. One key runs the whole cascade.

Get an API key See pricing

Prepaid token wallet · schema-only data-minimization mode · no free tier

uuid validator