Cross Domain · specification · None — an open source project by Christos Gkoros, rehomed in September 2026 from a personal repository to its own GitHub organization with published GOVERNANCE, CONTRIBUTING, SECURITY and RELEASING documents. Still no standards body, working group or foundation behind it.

OpenPredicate — formerly JSON Query Language (JQL)

JSON Query Language is a JSON-encoded, SQL-flavoured predicate language for the request body of search operations, described entirely by a single JSON Schema draft 2020-12 document. It covers the filter and nothing else — no projection, ordering or pagination — so the same grammar can be $ref’d from every POST /…/search and QUERY /… operation in an OpenAPI document, or bundled inline as an MCP tool’s inputSchema. Operators are grouped into conformance profiles (core, strings, regex, ranges, types, collections, refs, text), semantics are three-valued like SQL, and rejected filters come back as RFC 9457 Problem Details with a JSON Pointer at the offending clause.

github.com/OpenPredicate/open-p...The standard
None — an open source project by Christos Gkoros, rehomed in September 2026 from a personal repository to its own GitHub organization with published GOVERNANCE, CONTRIBUTING, SECURITY and RELEASING documents. Still no standards body, working group or foundation behind it.Governing body
2025First published
0.6.2 (2026)Current version
Yes — JSON Schema draft 2020-12, one ...Machine-readable schema · open
0providers in the catalog

Also known as OpenPredicate, OpenPredicate Filter, JQL, JSON Query Language.

Providers that carry OpenPredicate (formerly JSON Query Language) 0

No provider in the catalog carries this standard as a tag yet. That is a statement about the catalog's tagging, not about adoption: a provider that implements OpenPredicate (formerly JSON Query Language) and says so in its APIs.json profile appears here on the next build. Add or correct a listing.

Read from the API Evangelist standards directory, facts verified 2026-09-18. Provider links come from the catalog's own identity tags and are rebuilt nightly. If this page is wrong about a standard or a provider, say so.