Question 1

How do I map nested JSON objects with JsonMapper?

Accepted Answer

Define PHP classes for each nested structure and use doc block annotations (e.g., /** @var OtherClass */) or typed properties. JsonMapper will recursively instantiate objects based on the JSON hierarchy.

Question 2

JsonMapper vs Symfony Serializer: which should I use?

Accepted Answer

JsonMapper is focused purely on JSON-to-object mapping with type safety and middleware for customization. Symfony Serializer is more comprehensive, supporting multiple formats (XML, YAML) and complex configurations, but JsonMapper is lighter for simple JSON scenarios.

Question 3

Can JsonMapper handle arrays of objects in JSON?

Accepted Answer

Yes, use typed array properties (e.g., /** @var MyClass[] */ private $items;) or PHP 7.4+ array types. JsonMapper will map each JSON array element to an instance of the specified class.

Question 4

How to add custom logic after mapping with JsonMapper?

Accepted Answer

Utilize the final callback feature or create a middleware that extends AbstractMiddleware. Implement logic in the handle method to execute code post-mapping, such as validation or data enrichment.

Question 5

Does JsonMapper work with PHP 8 attributes for typing?

Accepted Answer

No, JsonMapper primarily supports doc block annotations and PHP 7.4 typed properties. To use PHP 8 attributes, you would need to write custom middleware to interpret them, which adds complexity.

Question 6

What if my JSON has missing or null properties?

Accepted Answer

Define nullable types (e.g., ?string) or set default values in your PHP class. JsonMapper will map properties as available; missing keys won't cause errors unless the property is non-nullable and required.

JSONMapper

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