# Extracting your schema

https://www.sanity.io/learn/course/typescripted-content/extracting-your-schema.md

Learn how to extract your Sanity Studio schema into a JSON file. This is a crucial step before generating TypeScript types. This file, a static representation of your data's shape, will be used for type generation.

Before generating TypeScript types, you need to extract the Sanity Studio schema written in JavaScript into a _static representation_, a JSON file describing the shape of the data your Sanity Studio produces.

1. **Run** the following Sanity CLI command in your studio project folder:

```sh:Terminal
npx sanity@latest schema extract
```

If your command ran successfully, you should see a new file called `schema.json` in your Studio project folder. In this course, you will only use this file for the type generation; you don’t need to do anything else with it.

If you explore its content, you will find your Studio schema described in a JSON format. For example, the document type for `venue` will look something like this:

```json:schema.json
{
  "name": "venue",
  "type": "document",
  "attributes": {
    "_id": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      }
    },
    "_type": {
      "type": "objectAttribute",
      "value": {
        "type": "string",
        "value": "venue"
      }
    },
    "_createdAt": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      }
    },
    "_updatedAt": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      }
    },
    "_rev": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      }
    },
    "name": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      },
      "optional": true
    },
    "city": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      },
      "optional": true
    },
    "country": {
      "type": "objectAttribute",
      "value": {
        "type": "string"
      },
      "optional": true
    }
  }
}
```

This file can be used to develop tooling that needs to know about a Sanity Studio schema. But in this course, you will use it to generate TypeScript types.