# `Snodo.Schema.Validator.Basic`
[🔗](https://github.com/joshrotenberg/snodo/blob/v0.1.0/lib/snodo/schema/validator/basic.ex#L15)

Dependency-free validation for the common JSON Schema subset used by tools.

The validator supports primitive and union `type` declarations, `required`,
recursive `properties`, `additionalProperties`, array `items`, `enum`,
`const`, and the usual string, numeric, array, and object size constraints.
Unknown keywords are preserved and ignored, so applications can use this as
a useful baseline while retaining schemas that require a complete backend.

Validation failures return `Snodo.Schema.Validator.Basic.Error` with a JSON
path and the keyword that rejected the value. The router puts the path and
message, which never quote the value, into the tool's `isError` result so a
model can correct its call.

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*Consult [api-reference.md](api-reference.md) for complete listing*