> For the complete documentation index, see [llms.txt](https://flowtestai.gitbook.io/flowtestai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://flowtestai.gitbook.io/flowtestai/flow-nodes/set-variable-node.md). # Set Variable Node This node is used to create a GLOBAL variable and assign it a value. The value assigned can be of type - * **Select** - Selects a part of the output from the previous node. For instance previous node is request node that outputs `{ "id": 10, "category" : [ {"id" : 10, "status" : "available"} ], .....}` , then you can use `id` or `category.0.id` to assign value to the variable. The actual values will be calculated on the fly when the graph is run. * **String** - Assigns a value of type string to the variable. * **Number** - Assigns a value of type number to the variable. * **Boolean** - Assigns a value of type boolean to the variable. * **Now** - Assigns a value of type now() epoch timestamp to the variable. The value of now() is calculated on the fly during graph run. * **Expression** - You can compute an expression on the fly to assign value to this variable. For instance , create a variable `startTime` that is assigned `now() - 3minutes`