# Lightweight backend modules

**URL:** <https://forum.shopware.com/t/lightweight-backend-modules/31042>\
**Category:** Shopware 3.5\
**Tags:** general\
**Created:** [1. Oktober 2015 um 16:26 UTC](https://forum.shopware.com/t/lightweight-backend-modules/31042 "2015-10-01T16:26:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Maksim\_N](https://avatars.discourse-cdn.com/v4/letter/m/f9ae1b/32.png) [@Maksim\_N](https://forum.shopware.com/u/Maksim_N)\
**Post date:** [1. Oktober 2015 um 16:26 UTC](https://forum.shopware.com/t/lightweight-backend-modules/31042/1 "2015-10-01T16:26:25Z")

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Hello I am trying to create backend module using the instructions from [https://developers.shopware.com/develop … d-modules/](https://developers.shopware.com/developers-guide/lightweight-backend-modules/) And I am totally confused. What is a createSimpleModule function? There is no function with the same name anywhere in your code. Where can I find the postmessage-api.js file? Is this documentation outdated? Any other ways how can I do the same?

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**Author:** ![Moritz\_Naczenski](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.shopware.com/moritz_naczenski/32/7792_2.png) [@Moritz\_Naczenski](https://forum.shopware.com/u/Moritz_Naczenski)\
**Post date:** [1. Oktober 2015 um 20:39 UTC](https://forum.shopware.com/t/lightweight-backend-modules/31042/2 "2015-10-01T20:39:00Z")

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Hello, do you already use Shopware 5.1? This feature is completely new and can only be used in 5.1.0 and not the previous versions. Moritz