ruby-grape / grape / 38093612200

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Pull #3029

github

Add a built-in :jsonl (JSON Lines) format

`format :jsonl` serves JSON Lines as application/jsonl: an Array renders
one line per element and any other object one line, each as the JSON
formatter renders it; a String is served as it is. An Enumerator body is
streamed, each element rendered only as the server reads the body, so a
large export never sits in memory whole. A formatter now signals that by
handing back a Grape::ServeStream::StreamResponse, which the formatter
middleware serves the way it serves `stream`.

A JSON Lines request body parses into an Array of its lines' values,
skipping blank lines, and stays in env['api.request.body'] like a JSON
Array body. Errors render as one JSON line.

The format is opt-in: it is kept out of ContentTypes::DEFAULTS, which
every API that declares no content type negotiates, and `format :jsonl`
finds its media type in ContentTypes::OPT_IN instead. A content type
declared for :jsonl (application/x-ndjson, say) still wins.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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