The [[endpoint|00001012920000]] to work with evaluated metadata and content of a specific zettel is ''/z/{ID}'', where ''{ID}'' is a placeholder for the [[zettel identifier|00001006050000]].
For example, to retrieve some evaluated data about this zettel you are currently viewing in [[Sz encoding|00001012920516]], just send an HTTP GET request to the endpoint ''/z/00001012053500''[^If [[authentication is enabled|00001010040100]], you must include a valid [[access token|00001012050200]] in the ''Authorization'' header] with the query parameter ''enc=sz''.
If successful, the output is a symbolic expression value:
```sh
# curl 'http://127.0.0.1:23123/z/00001012053500?enc=sz'
(BLOCK (PARA (TEXT "The ") (LINK-ZETTEL () "00001012920000" (TEXT "endpoint")) (TEXT " to work with evaluated metadata and content of a specific zettel is ") (LITERAL-INPUT () "/z/{ID}") (TEXT ", where ") (LITERAL-INPUT () "{ID}") (TEXT " is a placeholder for the ") ...
```
To select another encoding, you must provide the query parameter ''enc=ENCODING''.
Others are ""[[html|00001012920510]]"", ""[[text|00001012920519]]"", and some [[more|00001012920500]].
In addition, you may provide a query parameter ''part=PART'' to select the relevant [[part|00001012920800]] of a zettel.
```sh
# curl 'http://127.0.0.1:23123/z/00001012053500?enc=html&part=zettel'
API: Retrieve evaluated metadata and content of an existing zettel in various encodings
API: Retrieve evaluated metadata and content of an existing zettel in various encodings
The endpoint to work with evaluated metadata and content of a specific zettel is /z/{ID}, where {ID} is a
...
```
=== HTTP Status codes
; ''200''
: Retrieval was successful, the body contains an appropriate data value.
; ''400''
: Request was not valid.
There are several reasons for this.
Maybe the zettel identifier did not consist of exactly 14 digits or ''enc'' / ''part'' contained illegal values.
; ''403''
: You are not allowed to retrieve data of the given zettel.
; ''404''
: Zettel not found.
You probably used a zettel identifier that is not used in the Zettelstore.