# Create a local data structure with Snowplow CLI
> Generate a new data structure locally using Snowplow CLI with vendor and schema information in YAML format.
> Source: https://docs.snowplow.io/tutorials/data-structures-in-git/local-setup/
> Documentation index: https://docs.snowplow.io/llms.txt

Firstly we'll need a place to put things.

```bash
$ mkdir -p snowplow-structures/data-structures
$ cd snowplow-structures
```

> **Tip:** snowplow-cli data structures commands default to looking for data structures in `./data-structures`.

Now let's create our data structure. We'll create a custom event called 'login'.

```bash
$ snowplow-cli ds generate login --vendor com.example
```

> **Note:** `ds` is an alias for `data-structures`.

This should provide us the following output

```text
3:00PM INFO generate wrote=data-structures/com.example/login.yaml
```

The generated file is written to our default `data-structures` directory under a sub directory matching the `--vendor` we supplied with a filename that mirrors the name we gave the data structure. Help for all the arguments available to `generate` is available by running `snowplow-cli ds generate --help`.

> **Note:** This directory layout and file naming scheme is also followed by the [download](/docs/api-reference/snowplow-cli/data-structures/#downloading-data-structures) command.

Let's see what it has created for us.

```yml
apiVersion: v1
resourceType: data-structure
meta:
  hidden: false
  schemaType: event
  customData: {}
data:
  $schema: http://iglucentral.com/schemas/com.snowplowanalytics.self-desc/schema/jsonschema/1-0-0#
  self:
    vendor: com.example
    name: login
    format: jsonschema
    version: 1-0-0
  type: object
  properties: {}
  additionalProperties: false
```

- `apiVersion` should always be `v1`
- `resourceType` should remain `data-structure`
- `meta.hidden` directly relates to showing and hiding [in Console UI](/docs/event-studio/data-structures/hide-and-lock/#hide-a-data-structure)
- `meta.schemaType` can be `event` or `entity`
- `meta.customData` is a map of strings to strings that can be used to send across any key/value pairs you'd like to associate with the data structure
- `data` is the actual [snowplow self describing schema](/docs/fundamentals/schemas/#self-describing-json-schema-anatomy) that this data structure describes