TYPO3 Extension “headless” - JSON content API for TYPO3 PWA solution
====================================================================

Headless allows you to render JSON from TYPO3 content. You can customize
output by changing types, names and nesting of fields.

This extension provides backend part (JSON API) for TYPO3 PWA solution.
The other part is an extension providing JavaScript rendering for
content based on Vue.js and Nuxt, which will be published soon on
github. If you have any questions just drop a line in #initiative-pwa
Slack channel.

Features
--------

-  JSON API for content elements
-  JSON API for navigation, layouts
-  taking into account all language/translation configuration
   (e.g. fallback)
-  support for EXTt:news
-  easily extensible with custom fields or custom CE’s

Requirements
------------

Extension requires TYPO3 in version at least 9.5.

Installation
------------

| Install extension using composer
| ``composer require friendsoftypo3/headless``

Then, you should include extension typoscript template, and you are
ready to go.

JSON Content Object
-------------------

In headless extension we implemented new JSON Content Object, which
allows you to specify what fields you want to output, and how they will
look. First of all, let’s take a look at simple example

::

   lib.page = JSON
   lib.page {
     fields {
         header = TEXT
         header {
             field = header
         }
   }

Output

::

   {
       "header" : "headerFieldValue"
   }

in addition, keyword ``fields`` allow you to nest multiple times fields
in json, e.g.

::

   lib.page = JSON
   lib.page {
     fields {
         data {
           fields {
               foo = TEXT
               foo {
                   field = bar
               }
               foo1 = TEXT
               foo1 {
                   field = bar1
               }   
           }
         }
         
   }

Output

::

   {
       "data": [
           {
               "foo": "bar",
               "foo1": "bar1"
           }
       ]
   }

Customizing
~~~~~~~~~~~

You can override every field in output using typoscript. This extension
allows you to use standard typoscript objects such as TEXT, COA, CASE.

DataProcessing
~~~~~~~~~~~~~~

You can use Data Processors just like in ``FLUIDTEMPLATE`` Content
Object, e.g.

::

   lib.languages = JSON
   lib.languages {
       dataProcessing {
           10 = TYPO3\CMS\Frontend\DataProcessing\LanguageMenuProcessor
           10 {
               languages = auto
               as = languages
           }
       }
   }

Development
-----------

Development for this extension is happening as part of the TYPO3 PWA
initiative, see
https://typo3.org/community/teams/typo3-development/initiatives/pwa/

Credits
-------

A special thanks goes to `macopedia.com <https://macopedia.com>`__
company, which is sponsoring development of this solution.

Developers involved in the project
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-  Łukasz Uznański (Macopedia)
-  Adam Marcinkowski (Macopedia)
-  Vaclav Janoch (ITplusX)