# What are the constraints for 'id' member?

**URL:** <https://discuss.jsonapi.org/t/what-are-the-constraints-for-id-member/380>\
**Category:** Uncategorized\
**Created:** [March 7, 2016, 12:20pm UTC](https://discuss.jsonapi.org/t/what-are-the-constraints-for-id-member/380 "2016-03-07T12:20:13Z")\
**Posts on this page:** 1\
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**Author:** ![Joana](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.jsonapi.org/joana/32/59_2.png) [@Joana](https://discuss.jsonapi.org/u/Joana)\
**Post date:** [March 7, 2016, 8:32pm UTC](https://discuss.jsonapi.org/t/what-are-the-constraints-for-id-member/380/3 "2016-03-07T20:32:15Z")

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That was also my initial approach…

If we should apply that rule to ‘id’, than we could not have curly brackets on ids, and we have examples using them on [discussion about composite id](http://discuss.jsonapi.org/t/composite-id-inside-the-resource-object/367).

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