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The prototype docs have moved to a new website with an improved format. This documentation page can now be found here: https://lua-api.factorio.com/latest/types/bool.html

This wiki page is no longer updated and will be removed at some point in the future, so please update your browser bookmarks or other links that sent you here. If you'd like to contribute to the new docs, you can leave your feedback on the forums.

A variable type which can have one of two values: true or false. Wikipedia has a comprehensive article on Booleans.


Booleans used in prototypes can also be be defined by other variable types which are then coerced to boolean values by the game. This type coercion differs from the standard Lua truthy/falsy coercion.

It is recommended to only use true and false, not the options listed below.

Value  Factorio prototype loading
type coercion to boolean 
type coercion to boolean
"" false true
"true" true true
"false" false true
"0" false true
"<any number besides 0 (inside a string)>" true true
"<some random string>" not coerced, treated as a string true
0 false true
<any number besides 0> true true