JSON Schema seems to work pretty well - I&#x27;ve used it in Python applications:<p><a href="http:&#x2F;&#x2F;json-schema.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;json-schema.org&#x2F;</a><p>I don&#x27;t think there are any fancy graphical editors as there are for XSDs - but that&#x27;s probably not a bad thing as I suspect if things are getting so complex that a graphical editor makes sense then you&#x27;ve probably allowed things to get too complex anyway.