# How to add an Ember js helper?
**URL:** https://meta.discourse.org/t/how-to-add-an-ember-js-helper/40214
**Category:** Development
**Created:** [February 26, 2016, 6:37am UTC](https://meta.discourse.org/t/how-to-add-an-ember-js-helper/40214 "2016-02-26T06:37:43Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@pdx](https://meta.discourse.org/u/pdx)
#### Post date: [February 26, 2016, 6:37am UTC](https://meta.discourse.org/t/how-to-add-an-ember-js-helper/40214/1 "2016-02-26T06:37:43Z")
I’m trying to add an emberjs helper to an existing plugin (discourse-tagging).
According to the ember docs, you should place a helper in app/helpers, and name it helper-name.js.
It can then be used like this: {{ helper-name value }} in templates.
However, no matter where I place the file it I get the error: “Uncaught Error: Assertion Failed: A helper named ‘helper-name’ could not be found”
I’ve tried these locations:
app/helpers/
assets/javacripts/discourse/helpers
Where should emberjs helpers be placed in plugins?
Thanks! 🙂
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### Author:  [@eviltrout](https://meta.discourse.org/u/eviltrout)
#### Post date: [February 26, 2016, 5:30pm UTC](https://meta.discourse.org/t/how-to-add-an-ember-js-helper/40214/2 "2016-02-26T17:30:52Z")
In your plugin, you should add it in `assets/javascripts/discourse/helpers` and make sure it has a dash in the filename like `test-helper`.
I just tried this locally and the helper was registered. I see you tried that path and it did not. Perhaps you need to `rm -rf tmp` in development mode?
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### Author:  [@eviltrout](https://meta.discourse.org/u/eviltrout)
#### Post date: [February 26, 2016, 8:00pm UTC](https://meta.discourse.org/t/how-to-add-an-ember-js-helper/40214/3 "2016-02-26T20:00:43Z")