# Passing Variables

Before going into each workflow component/node, it's important to understand how variables are passed between nodes.

Each node will output a JSON object. To reference specific output from a previous node, you can use dot notation. 

Take the following example where we define an email subject in a code node and want to reference it in the built-in Gmail: Send Email Integration.

<figure><img src="/files/69ooSPTZGeO42JmRuquV" alt=""><figcaption></figcaption></figure>

The code node outputs:

```
"email_subject": {
    "successfull": true,
    "data": {
      "results": "Email from Orchestra",
      "stdout": "",
      "stderr": "",
      "error": "",
      "sandbox_id": "sandbox-5a47"
    },
    "error": null
  }
```

In the Gmail integration node, we can set the Subject variable to be

`{{email_subject.data.results}}`&#x20;

This sets "Email from Orchestra" to be the Subject of the email.

For examples of how to pass variables between nodes, see the workflow examples in the [workflow library](/arcee-orchestra/workflow-library.md).


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