langflow-ai/langflow · error · Error

Deployment name is required

Error message

Deployment name is required

What it means

Thrown by buildDeploymentPayload (the create-path payload builder in the deployments page) when its `isDeploymentNameValid` argument is false. Langflow requires a non-empty deployment name before it can assemble a DeploymentCreateRequest, so the builder fails fast instead of sending an invalid payload to the API.

Source

Thrown at src/frontend/src/pages/MainPage/pages/deploymentsPage/helpers/deployment-payload-builders.ts:123

  selectedLlm,
  selectedVersionByFlow,
  toolNameByFlow,
}: {
  attachedConnectionByFlow: Map<string, string[]>;
  connections: ConnectionItem[];
  deploymentDescription: string;
  deploymentName: string;
  deploymentType: DeploymentType;
  isDeploymentNameValid: boolean;
  projectId?: string;
  providerId: string;
  removedFlowIds: Set<string>;
  selectedLlm: string;
  selectedVersionByFlow: Map<string, SelectedFlowVersion>;
  toolNameByFlow: Map<string, string>;
}): DeploymentCreateRequest {
  if (!isDeploymentNameValid) {
    throw new Error("Deployment name is required");
  }
  const allConnectionIds = new Set<string>();
  Array.from(attachedConnectionByFlow.values()).forEach((ids) => {
    ids.forEach((id) => allConnectionIds.add(id));
  });

  const addFlows: DeploymentCreateRequest["provider_data"]["add_flows"] = [];
  for (const [attachmentKey, versionEntry] of Array.from(
    selectedVersionByFlow,
  )) {
    if (removedFlowIds.has(attachmentKey)) continue;
    const connectionIds =
      getValueByAttachmentKeyOrFlowId(
        attachedConnectionByFlow,
        attachmentKey,
        versionEntry.flowId,
      ) ?? [];
    const strictToolName = getScopedToolName(

View on GitHub (pinned to 976ec789d2)

Solutions

1. Fill in a non-empty deployment name in the creation form before submitting
2. If calling buildDeploymentPayload directly, pass isDeploymentNameValid: deploymentName.trim().length > 0
3. Disable the submit button while the name is invalid so the throw is unreachable
4. Wrap the call in try/catch and surface the message as a form-field error instead of a crash

Example fix

// before
const payload = buildDeploymentPayload({ ...args, isDeploymentNameValid });

// after
const isDeploymentNameValid = deploymentName.trim().length > 0;
const payload = isDeploymentNameValid
  ? buildDeploymentPayload({ ...args, isDeploymentNameValid })
  : undefined; // keep button disabled instead

const isDeploymentNameValid = deploymentName.trim().length > 0;
if (!isDeploymentNameValid) {
  // keep the submit button disabled / show field error; never call the builder
}

const hasValidDeploymentName = (name: string): boolean =>
  typeof name === "string" && name.trim().length > 0;

try {
  const payload = buildDeploymentPayload(args);
} catch (e) {
  if (e instanceof Error && e.message === "Deployment name is required") {
    focusNameInput(); // recoverable form error
  } else throw e;
}

When it happens

Trigger: Clicking Create/Deploy in the new-deployment modal while the name field is empty (or fails the form's name validation), which passes isDeploymentNameValid=false into buildDeploymentPayload.

Common situations: UI state desync where the submit button is enabled but the name input was cleared or trimmed to empty; programmatic calls to buildDeploymentPayload without deriving isDeploymentNameValid from deploymentName.trim().length > 0.

Related errors

• Invalid flow data
• Invalid JSON format.
• No valid MCP server found in the input.
• Failed to install MCP
• The file size is too large. Please select a file smaller tha

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/3a41b8c6fb563b10. Report an issue: GitHub.