|Internet media type|
|Uniform Type Identifier (UTI)||public.json|
|Type of format||Data interchange|
|Standard||STD 90/RFC 8259, ECMA-404, ISO/IEC 21778:2017|
application/json. JSON filenames use the extension
Douglas Crockford originally specified the JSON format in the early 2000s. It was first standardized in 2013 in RFC 7158 and ECMA-404. The latest JSON format standard was published in 2017 as RFC 8259, and remains consistent with ECMA-404. That same year, JSON was also standardized as ISO/IEC 21778:2017. The ECMA and ISO standards describes only the allowed syntax, whereas the RFC covers some security and interoperability considerations.