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When first using Restangular on a working website I got the following JavaScript error:

Failed to instantiate module restangular due to: '_' is undefined

What am I missing? What does it mean that '_' is undefined (in the Restangular module)?

Ben Lesh
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1 Answers1

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It's a simple oversight. The '_' (underscore) is a JavaScript utility library that Restangular uses and depends on. Include Lodash or Undrescore library before the AngularJS library (in your HTML):

<script src="lodash.js"></script>

or

<script src="underscore.js"></script>

PS: Double check the library script and path exist as referenced in your SCRIPT tag.

Additional readings:

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