langflow/docs/versioned_docs/version-1.9.0/API-Reference/javascript-examples/workflows-api/example-synchronous-request.js

const url = `${process.env.LANGFLOW_SERVER_URL ?? ""}/api/v2/workflows`;

const options = {
  method: 'POST',
  headers: {
    "Content-Type": `application/json`,
    "x-api-key": `${process.env.LANGFLOW_API_KEY ?? ""}`,
  },
  body: JSON.stringify({
  "flow_id": "flow_67ccd2be17f0819081ff3bb2cf6508e60bb6a6b452d3795b",
  "background": false,
  "inputs": {
    "ChatInput-abc.input_type": "chat",
    "ChatInput-abc.input_value": "what is 2+2",
    "ChatInput-abc.session_id": "session-123"
  }
}),
};

fetch(url, options)
  .then(async (response) => {
    if (!response.ok) {
      throw new Error(`HTTP ${response.status}`);
    }
    const text = await response.text();
    console.log(text);
  })
  .catch((error) => console.error(error));