# JSON mapgen questions

**URL:** https://discourse.cataclysmdda.org/t/json-mapgen-questions/9182
**Category:** The Toolbox
**Created:** [March 19, 2015, 2:06pm UTC](https://discourse.cataclysmdda.org/t/json-mapgen-questions/9182 "2015-03-19T14:06:02Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Trinsic](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@Trinsic](https://discourse.cataclysmdda.org/u/Trinsic)
#### Post date: [March 19, 2015, 2:06pm UTC](https://discourse.cataclysmdda.org/t/json-mapgen-questions/9182/1 "2015-03-19T14:06:02Z")

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I was wondering if anyone could help with a couple of questions I have about the mapgen JSON? I’ve poked around in the wiki and the forums, but haven’t been able to locate the information myself.  
First, what are the “chances” in the place\_vehicles/place\_items? Are they percentages? One in X? Something else?  
Second, for the place\_items, how does the “repeat” work and what do the numbers associated with it mean?

Thanks!