Javascript Object Notation (JSON) is a lightweight, text-based, language-independent data interchange format. It was derived from the ECMAScript Programming Language Standard and was published in RFC 4627, an Informational document. JSON has come into very broad use, often instead of or in addition to XML. RFC 4627 cites a 1999 version of the ECMAScript Language Specification. However, since the publication of RFC 4627, the ECMA specifications have turned the relationship around, and themselves cite RFC 4627 as the documentation for JSON. A number of Standards Track IETF specifications have also cited RFC 4627, and more are in development (for example, the work in the JOSE working group). It makes sense to move RFC 4627 onto the Standards Track. There are also a number of other JSON-related proposals for Standards Track that would benefit from review from both the IETF and the larger JSON-using communities created by a working group focused on JSON. The JSON working group will have as its only initial task the minor revision of RFC 4627 to bring it onto the Standards Track. As noted above, RFC 4627 is a mature and widely cited specification. The initial goal of this work is essentially a reclassification in place, with minimal changes. The working group will review errata and update the document as needed to incorporate those, and will correct significant errors and inconsistencies, but will keep changes at this stage to a minimum. It is acknowledged that there are differences between RFC 4627 and the ECMAScript specification in the rules for parsing JSON. Any changes that break compatibility with existing implementations of either RFC 4627 or the ECMAScript specification will need to have very strong justification and broad support. All differences between RFC 4627 or the current ECMAScript specification will be documented in the new RFC. This documentation will include both the WG consensus for the rationale of the changes and the expected impact of the changes. The resulting document will be jointly published as an RFC and by ECMA. ECMA participants will be participating in the working group editing through the normal process of working group participation. The responsible AD will coordinate the approval process with ECMA so that the versions of the document that are approved by each body are the same. There are also various proposals for JSON extensions and related standards. The working group will consider those proposals only after the initial work is done, and must recharter with specific work items for any additional work it might select.