In my app, I’m implementing a questionnaire system and I’d like to implement tags for questions — very similar to tags in questions here or Stack Overflow.

I wanted to get some advices on how to implement this as a property in my object. Should they be an array of strings — as below?

{   "id": 123,   "question": "What is your favorite color?",   "tags": [      "personality trait",      "likes and dislikes"   ] } 

Or is it better to use some type of identifier, instead of the actual verbiage?

{    "id": 123,    "question": "What is your favorite color?",    "tags": [1234, 89645] } 

I’m thinking about storing these questions in a NoSQL database and I want users to be able to run queries based on these tags. For example, if someone wants to pull all questions that are about “personality traits”, I should be able to run a query that contains that particular tag.