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The getSessionId() method returns the unique session ID associated with your active sandbox connection. This ID identifies the live session currently linked to your WebSocket connection.

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getSessionId()

Description: Returns the current sandbox session ID, or null if not connected. Parameters: None Returns: string | null - Session ID or null Example: 
await sandbox.create({ shouldBackupFilesystem: false })
console.log(sandbox.getSessionId()) // 'session-abc123'
Session ID is different from snippet ID. Session is temporary, snippet is persistent.