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Tools.JSON 
Tools.JSON.JSONObject 
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    Method Tools.JSON.JSONObject()->optString()
    
 
- Method
optString
- 
  string optString(string key, string|void defaultValue)  
- Description
- 
  Get an optional string associated with a key.
 It returns the defaultValue if there is no such key. 
 
- Parameter key
- 
  A key string. 
 
- Parameter defaultValue
- 
  The default 
 
- Returns
- 
  A string which is the value. 
 
     
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