diff -r a34373b17e58 -r d17eba9fae33 docs/Writerside/topics/json.h.md
--- a/docs/Writerside/topics/json.h.md	Sat Mar 29 19:58:41 2025 +0100
+++ b/docs/Writerside/topics/json.h.md	Sun Mar 30 18:21:43 2025 +0200
@@ -1,8 +1,9 @@
 # JSON
 
-<warning>
-New Feature - will be documented soon!
-</warning>
+The UCX JSON API allows [parsing](#parser) and [formatting](#writer) of JSON data.
+
+The parser API is similar to the [properties](properties.h.md) parser,
+but - due to the nature of JSON - is not allocation-free.
 
 ## Parser
 
@@ -226,9 +227,22 @@
         cx_write_func wfunc, const CxJsonWriter* settings);
 ```
 
-<warning>
-TODO: document
-</warning>
+A JSON value can be formatted with the `cxJsonWrite()` function.
+
+The `target` can be a stream, a UCX [buffer](buffer.h.md), or anything else that can be written to with a write function.
+The behavior of the function is controlled via a `CxJsonWriter` struct.
+With the functions `cxJsonWriterCompact()` and `cxJsonWriterPretty()` you can create default settings,
+which you may modify to suit your needs.
+
+| Setting           | Compact Default | Pretty Default                   | Description                                                                                                                                                      |
+|-------------------|-----------------|----------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `pretty`          | `false`         | `true`                           | If true, the JSON will be formatted with line breaks and tabs or spaces. If false, output is as compact as possible without extra characters.                    |
+| `sort_members`    | `true`          | `true`                           | If false members are written in the order in which they were added. If true, they are sorted lexicographically.                                                  |
+| `frac_max_digits` | 6               | 6                                | The maximum number of fractional digits in a number value.                                                                                                       |
+| `indent_space`    | ignored         | depends on `use_spaces` argument | If true, use spaces for indentation, otherwise use tabs.                                                                                                         |
+| `indent`          | ignored         | 4                                | If `indent_space` is `true`, this is the number of spaces per tab. Ignored otherwise.                                                                            |
+| `escape_slash`    | `false`         | `false`                          | If `true`, the slash character (a.k.a forward solidus: `/`) is also escaped. This is usually only needed when you want to use JSON as part of an HTML attribute. |
+
 
 <seealso>
 <category ref="apidoc">