Create a multi-turn non-streaming conversation with Vertex AI

Sample demonstrating how to set-up the Vertex AI SDK and create a non-streaming conversation with three consecutive messages sent to the model.

Code sample

Node.js

Before trying this sample, follow the Node.js setup instructions in the Vertex AI quickstart using client libraries . For more information, see the Vertex AI Node.js API reference documentation .

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  const 
  
 { 
 VertexAI 
 } 
  
 = 
  
 require 
 ( 
 ' @google-cloud/vertexai 
' 
 ); 
 /** 
 * TODO(developer): Update these variables before running the sample. 
 */ 
 async 
  
 function 
  
 createNonStreamingChat 
 ( 
  
 projectId 
  
 = 
  
 'PROJECT_ID' 
 , 
  
 location 
  
 = 
  
 'us-central1' 
 , 
  
 model 
  
 = 
  
 'gemini-2.0-flash-001' 
 ) 
  
 { 
  
 // Initialize Vertex with your Cloud project and location 
  
 const 
  
 vertexAI 
  
 = 
  
 new 
  
  VertexAI 
 
 ({ 
 project 
 : 
  
 projectId 
 , 
  
 location 
 : 
  
 location 
 }); 
  
 // Instantiate the model 
  
 const 
  
 generativeModel 
  
 = 
  
 vertexAI 
 . 
  getGenerativeModel 
 
 ({ 
  
 model 
 : 
  
 model 
 , 
  
 }); 
  
 const 
  
 chat 
  
 = 
  
 generativeModel 
 . 
 startChat 
 ({}); 
  
 const 
  
 result1 
  
 = 
  
 await 
  
 chat 
 . 
 sendMessage 
 ( 
 'Hello' 
 ); 
  
 const 
  
 response1 
  
 = 
  
 await 
  
 result1 
 . 
 response 
 ; 
  
 console 
 . 
 log 
 ( 
 'Chat response 1: ' 
 , 
  
 JSON 
 . 
 stringify 
 ( 
 response1 
 )); 
  
 const 
  
 result2 
  
 = 
  
 await 
  
 chat 
 . 
 sendMessage 
 ( 
  
 'Can you tell me a scientific fun fact?' 
  
 ); 
  
 const 
  
 response2 
  
 = 
  
 await 
  
 result2 
 . 
 response 
 ; 
  
 console 
 . 
 log 
 ( 
 'Chat response 2: ' 
 , 
  
 JSON 
 . 
 stringify 
 ( 
 response2 
 )); 
  
 const 
  
 result3 
  
 = 
  
 await 
  
 chat 
 . 
 sendMessage 
 ( 
 'How can I learn more about that?' 
 ); 
  
 const 
  
 response3 
  
 = 
  
 await 
  
 result3 
 . 
 response 
 ; 
  
 console 
 . 
 log 
 ( 
 'Chat response 3: ' 
 , 
  
 JSON 
 . 
 stringify 
 ( 
 response3 
 )); 
 }

What's next

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Code sample

Node.js

What's next

Create a multi-turn non-streaming conversation with Vertex AI