# Metadata

The metadata for a process allows you to store arbitrary JSON data with that process, e.g. if you have an app that uses the datarhei Core API you can store app-specific information in the metadata.

In order not to conflict with other apps that might write to the metadata as well, you have to provide a key under which your metadata is stored. Think of a namespace or similar.

## Create, Update

Add or update the metadata for a process and key.

Example: Write a metadata object into the metadata for the process `test` and key `desc`.

{% tabs %}
{% tab title="Curl" %}

```bash
curl http://127.0.0.1:8080/api/v3/process/test/metadata/desc \
   -H 'accept: application/json' \
   -H 'Content-Type: application/json' \
   -X POST \
   -d '{
         "title": "My title",
         "description": "My description."
      }'
```

{% endtab %}

{% tab title="PyClient" %}

```python
from core_client import Client

client = Client(
    base_url="http://127.0.0.1:8080"
)
client.login()

client.v3_process_put_metadata(
    id="test",
    key="desc",
    data={
        "title": "My title",
        "description": "My description."
    }
)
```

{% endtab %}

{% tab title="GoClient" %}

```go
import (
    "github.com/datarhei/core-client-go/v16"
)

client, _ := coreclient.New(coreclient.Config{
    Address: "https://127.0.0.1:8080",
})

data := map[string]string{
    "title": "My title",
    "description": "My description.",
}

err := client.ProcessMetadataSet("test", "desc", data)
if err != nil {
    ...
}
```

{% endtab %}
{% endtabs %}

Description:

{% openapi src="/files/AUmcih4nC1IX6QuhfO8m" path="/api/v3/process/{id}/metadata/{key}" method="put" %}
[doc.json](https://951110271-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAQRvnKSkK1SsZB0HeYhh%2Fuploads%2F3duUHhkhwH69BGLlHYga%2Fdoc.json?alt=media\&token=dcd2b063-c826-4652-9a98-c265ec41a469)
{% endopenapi %}

## Read

Read out the stored metadata. The key is optional. If the key is not provided, all stored metadata for that process will be in the result.

Example: read the metadata object for process `test` that is stored under the key `desc`.

{% tabs %}
{% tab title="Curl" %}

```bash
curl http://127.0.0.1:8080/api/v3/process/test/metadata/desc \
   -H 'accept: application/json' \
   -X GET
```

{% endtab %}

{% tab title="PyClient" %}

```python
from core_client import Client

client = Client(
    base_url="http://127.0.0.1:8080"
)
client.login()

client.v3_process_get_metadata(
    id="test",
    key="desc"
)
```

{% endtab %}

{% tab title="GoClient" %}

```go
import (
    "fmt"
    "github.com/datarhei/core-client-go/v16"
)

client, _ := coreclient.New(coreclient.Config{
    Address: "https://127.0.0.1:8080",
})

metadata, err := client.ProcessMetadata("test", "desc")
if err != nil {
    ...
}

fmt.Printf("%+v\n", metadata)
```

{% endtab %}
{% endtabs %}

Description:

{% openapi src="/files/AUmcih4nC1IX6QuhfO8m" path="/api/v3/process/{id}/metadata/{key}" method="get" %}
[doc.json](https://951110271-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAQRvnKSkK1SsZB0HeYhh%2Fuploads%2F3duUHhkhwH69BGLlHYga%2Fdoc.json?alt=media\&token=dcd2b063-c826-4652-9a98-c265ec41a469)
{% endopenapi %}


---

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