How-to guides 

Step-by-step guides for common tasks around the JSON output of EXT:nb_headless_content_blocks.

• Define image variants — responsive thumbnails per field via headless.yaml, with per-site TypoScript overrides
• Migrate legacy thumbnails — replace the old headless.php thumbnail generators
• Post-process JSON with headless.php
• Add sub data processors — menus, record lists and other TypoScript data inside a block's data
• Render containers — EXT:container columns via the nb-container-json processor
• Register a custom normalizer — own value types in the JSON output
• Register a field value transformer — own string field shaping (like password blanking)
• Modify fields with the PSR-14 event (deprecated — prefer normalizers/transformers)