On July 28, 2026, a new version of the Model Context Protocol was released, carrying every message over JSON-RPC 2.0. JSON, extracted from JavaScript's object syntax by Douglas Crockford in the early 2000s, has become the standard language for machine-to-machine communication. It is standardized by RFC 8259, ECMA-404 and ISO/IEC 21778. JSON is a text format with six types: string, number, boolean, null, array, and object. Its simplicity is its advantage, though it has limits: no comments, unsafe 64-bit integers beyond 2 to the power of 53, no binary type (requiring Base64, increasing size by roughly 33 percent), and no native date type. The article contrasts JSON with XML and the API approaches REST and SOAP, and mentions free browser-based tools for working with JSON files without uploading them to third-party servers.