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From MapToolDoc

json.fields

json.fields() Function

• Introduced in version 1.3b49

Returns the fields (keys) for a JSON Object or the indexes for a JSON Array as a string list. The type of the value returned depends on the delimiter parameter.

  • If the delimiter is not specified then a string list is returned with the default value of ',' is used.
  • If the delimiter "json" then a JSON Array is returned.
  • Otherwise a string list is returned with the delimiter passed in.

Note: Because JSON Objects are unordered, json.fields will not reflect the order they were set in.

Usage 

  1. [h: strList = json.fields(jobj)]
  2. [h: strList = json.fields(jobj, delim)]
  3. [h: jobj = json.fields(jobj, 'json')]

Example 

  1.   [h:a=json.fromStrProp("a=1;b=44;c=12")] [r:json.fields(a)]
  2.   [h:a=json.fromList("a,1,g,4")][r:json.fields(a)]
  3.   [h:a=json.fromStrProp("a=1;b=44;c=12")] [r:json.fields(a, "json")]

Returns 

 a,c,b
 0,1,2,3 
 ["a","c","b"]
Retrieved from "http://www.lmwcs.com/rptools/wiki/json.fields"