Standards:

• RFC 7159: The application/json Media Type for JavaScript Object Notation (JSON), March 2014.
  (errata and status)
• RFC 7158: The application/json Media Type for JavaScript Object Notation (JSON), March 2013 (OBSOLETE).
• RFC 4627: The application/json Media Type for JavaScript Object Notation (JSON), (OBSOLETE)
• RFC 7493: The I-JSON Message Format, March 2015.
• JSON Homepage (json.org)
• ECMA 262 (PDF), 3rd. edition (1999), aka ECMAscript/JavaScript.
• IEEE 754-1985: Standard for Binary Floating-Point Arithmetic.

Other python implementations:

Read my Comparing JSON Modules report.

• json module in Python 3.x
• jsonlib
• JsonUtils
• python-cjson
• python-json
• simplejson
• zif.jsonserver (for Zope)
• pyparsing.jsonParser (decoding only)

Useful links:

• JSON Wikipedia article.
• Parsing JSON is a Minefield, by Nicolas Seriot, 2016.
• Choosing a Python JSON Translator, by Jim Washington, February 2007.
  [Note this uses demjson version 1.1; the speed of the current version is many times better than what was reported here.]