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If an event schema includes a field "userId" with value 42, what will be the data type of "userId" in the event payload?

medium📝 query result Q5 of 15
Microservices - Event-Driven Architecture
If an event schema includes a field "userId" with value 42, what will be the data type of "userId" in the event payload?
ABoolean
BString
CNumber
DNull
Step-by-Step Solution
Solution:

  1. Step 1: Identify the value type

    The value 42 is a numeric literal without quotes.

  2. Step 2: Determine JSON data type

    Numbers without quotes in JSON are treated as Number type.

  3. Final Answer:

    Number -> Option C

  4. Quick Check:

    Value 42 type = Number [OK]
Quick Trick: Numbers in JSON have no quotes [OK]
Common Mistakes:
MISTAKES
  • Assuming numbers are strings
  • Confusing with boolean or null

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