JSON exceptions

[chrisminett]

• Add exact JSON method return type.
• Use JSON exceptions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.88%. Comparing base (48a4b77) to head (d23d444).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #16      +/-   ##
============================================
+ Coverage     84.61%   91.88%   +7.26%     
- Complexity       73       80       +7     
============================================
  Files             5        5              
  Lines           260      271      +11     
============================================
+ Hits            220      249      +29     
+ Misses           40       22      -18     

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