# JSON undefined error
**URL:** https://www.finalbuilder.com/forums/t/json-undefined-error/7741
**Category:** Discussion
**Tags:** finalbuilder, actions
**Created:** [November 19, 2025, 8:25pm UTC](https://www.finalbuilder.com/forums/t/json-undefined-error/7741 "2025-11-19T20:25:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@rjantz](https://www.finalbuilder.com/forums/u/rjantz)
#### Post date: [November 19, 2025, 8:25pm UTC](https://www.finalbuilder.com/forums/t/json-undefined-error/7741/1 "2025-11-19T20:25:07Z")
Is there a way to use `JSON.parse` as in the following example in `AfterAction`?
`if (ActionResult) {`
` var data = JSON.parse(shareCommandOutput);`
` ReleaseNotes += “\r\n” + "This build is available from " +data.URL;`
`}`
This returns the error of:
Error Executing script : AfterAction
Microsoft JScript runtime error
‘JSON’ is undefined
Line: 3
Char : 3
## Error in AfterScript : JavaScript
This Action did execute successfully however an error occurred in the AfterAction script.
---
### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [November 19, 2025, 11:09pm UTC](https://www.finalbuilder.com/forums/t/json-undefined-error/7741/2 "2025-11-19T23:09:12Z")
The active scripting engine doesn’t have a JSON object, so you have to include it manually
```auto
//USEUNIT "%FBDIR%\Scripts\json2.js"
var json = '{"result":true, "count":42}';
obj = JSON.parse(json);
alert(obj.count);
```
---
### Author:  [@rjantz](https://www.finalbuilder.com/forums/u/rjantz)
#### Post date: [November 20, 2025, 3:49pm UTC](https://www.finalbuilder.com/forums/t/json-undefined-error/7741/3 "2025-11-20T15:49:03Z")
Yes, that worked as long as there was no space in front of _`//USEUNIT "%FBDIR%\Scripts\json2.js"`. I also happened to note that `%FBDIR%` includes a `\` so there was a double._