Data type decides how data will to send and received from api. From version 1.1.0 it is an optional metadata, by default its value will be "string", earlier it was required metadata. Now you can able add empty properties also.

{
  "person": {                   // entity name
    "firstName": {              // property name
      "dataType": "string",     // string, number, boolean, array, group & file
    },
    "lastName": {},             // empty property, default dataType will be "string".    
    ...
}

String,

Number,

Boolean,

Array

Some input types allow to get multiple values, which will automatically send data as array of that specific data type.

Group

File

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