You can watch my tutorial here that explains how to do that correctly: API JSON Tutorial (Video)
If you need help, be sure to:
- Post the full JSON response as text (not a screenshot) and format it using the </> button in the toolbar:
- Tell us which property name(s) you’re trying to get the values of.
- Post a screenshot of the blocks you’ve tried and the result (e.g. null) you’re getting.
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Need help? How to Ask Great Questions 
Debugging A Project API JSON Tutorial