---
title: "Reference"
manual: "Headless Content Blocks"
version: "main"
permalink: "https://docs.typo3.org/permalink/netzbewegung/nb-headless-content-blocks:reference@main"
source: "Reference/Index.rst"
rendered: "2026-09-22T01:30:32+00:00"
---

# Reference {#reference}

Lookup pages for the JSON output contract and the processors' options.

-   [JSON contract](https://docs.typo3.org/permalink/netzbewegung/nb-headless-content-blocks:json-contract@main) — the exact output shape per field type, frozen by characterization tests
-   [Normalizers and transformers](https://docs.typo3.org/permalink/netzbewegung/nb-headless-content-blocks:normalizers-and-transformers@main) — built-in services, interfaces and DI tags
-   [Processor options](https://docs.typo3.org/permalink/netzbewegung/nb-headless-content-blocks:processor-options@main) — TypoScript options of `nb-content-blocks-json` and `nb-container-json`