# \[Modding tool\] JSON Duplicate Checker

**URL:** <https://discourse.cataclysmdda.org/t/modding-tool-json-duplicate-checker/8700>\
**Category:** The Lab\
**Created:** [January 21, 2015, 7:37pm UTC](https://discourse.cataclysmdda.org/t/modding-tool-json-duplicate-checker/8700 "2015-01-21T19:37:32Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ThinkInvisible](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/thinkinvisible/32/313_2.png) [@ThinkInvisible](https://discourse.cataclysmdda.org/u/ThinkInvisible)\
**Post date:** [January 21, 2015, 7:37pm UTC](https://discourse.cataclysmdda.org/t/modding-tool-json-duplicate-checker/8700/1 "2015-01-21T19:37:32Z")

</div>

After I found out about [this little bug here](https://github.com/CleverRaven/Cataclysm-DDA/issues/10944), I decided to write a HTML/Javascript tool that checks JSON files for duplicate entries.

[dupchecker.html](http://dl.dropbox.com/u/97311769/dupchecker.html)

To use for C:DDA: Type ‘id’ into the text box and uncheck the check box. Click the Browse button and select any C:DDA JSON files you want to scan (selecting multiple files is OK). If any file contains the same ID more than once, a warning listing every duplicate will appear under its name.

Please use this before submitting a particularly big change to the JSONs!