LazyCollection does not work with json streaming responses

[Sparclex]

Laravel Version

12.34.0

PHP Version

8.4.13

Description

When streaming a LazyCollection as JSON, the response is not actually streamed — instead, the entire dataset is loaded into memory.

I found that this happens because LazyCollection implements JsonSerializable via Enumerable, causing it to be serialized in-memory rather than using StreamedJsonResponse.

Proposed Solution

LazyCollection should override the jsonSerialize method from Enumerable to use a more memory-efficient approach, same as StreamedJsonResponse::streamData.

Steps To Reproduce

https://github.com/Sparclex/lazy-collection-json-memory-issue

Run the migrations an go to the start page. You'll find two links one with a lazy collection implementation and one with a generator function wrapped around the lazy collection (for which streaming works).

[macropay-solutions]

We found out that a json can't be streamed that easily see this: symfony/symfony#60257

This is not an issue from Laravel.

You can stream json lines if you want: https://marius-ciclistu.medium.com/streamed-json-lines-using-laravel-crud-wizard-free-cd650e272caa

[shaedrich]

would be different if this was jsonl