One Person Ops — Contract Check

This free tool validates JSON locally in your browser or Node.js. It implements
a documented bounded subset, not the complete JSON Schema specification.
It does not send your input to a server, use an LLM, collect telemetry or charge.

Module: src/validator.mjs — import validateContract({request_id, schema, data}).
CLI: download BOTH src/cli.mjs and src/validator.mjs into the same folder.
Run with Node.js 20+: node cli.mjs < request.json
Exit codes: 0 valid, 1 invalid data, 2 invalid request.
Receipt schema: contract/validation-receipt.schema.json
Exact public artifact hashes and source revision: release.json

Limits: canonical request at most 65,536 UTF-8 bytes; CLI and browser also cap
raw input. Maximum nesting is 16 and at most 100 errors are returned.
String length counts Unicode code points. Supported schema keywords are type,
required, properties, additionalProperties (boolean), items, enum, minLength,
maxLength, minimum, maximum, minItems and maxItems. Unsupported keywords are
rejected; no external references, regex, files or remote schemas are resolved.

The broader One Person Ops agent-facing business service is not provided by
this component. There is no messaging API, persistent inbox, payment service
or promise of revenue in this release. Do not put secrets in public messages.