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JSON.deserialize
Learn JSON.deserialize in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
JSON.deserialize is an atomic Apex topic inside Testing & Integration. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what JSON.deserialize changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
AccountDto dto=(AccountDto)JSON.deserialize('{"name":"Ava"}', AccountDto.class);
Test boundary input such as empty text, unexpected encoding, or malformed structured data so parsing assumptions are explicit.