What is the main difference between validator and Expression.

[Hrishabh.Sharma]

Difference between Validator and Expression in Thingworx

[VladimirN]

• Article - "Using the Validator Widget/Function in ThingWorx": https://www.ptc.com/en/support/article/CS250781
• From "Help Center":
  https://support.ptc.com/help/thingworx_hc/thingworx_8_hc/en/index.html#page/ThingWorx/Help/Mashup_Builder/Functions/Validator.html
  https://support.ptc.com/help/thingworx_hc/thingworx_8_hc/en/index.html#page/ThingWorx/Help/Mashup_Builder/Functions/Expression.html

[DanZ · Accepted solution]

The most obvious is that the validator only offers a Boolean output*, whilst the expression can return nearly any data type that Thingworx has to offer. A validator also provides additional event outputs for a True or False result.

*However, you can have other data types than Boolean returned, e.g. by using "Output = "Hi there". This (unfortunately) overwrites the implicit boolean output.