LangChain Reference home pageLangChain ReferenceLangChain Reference
  • GitHub
  • Main Docs
Deep Agents
LangChain
LangGraph
Integrations
LangSmith
  • Overview
  • Agent
  • Middleware
  • Backends
  • Sandboxes
  • Skills
  • Subagents
  • Configuration
  • Types
Modal
Daytona
Deno
Node VFS
Sandbox Standard Tests
  • Vitest
⌘I

LangChain Assistant

Ask a question to get started

Enter to send•Shift+Enter new line

Menu

OverviewAgentMiddlewareBackendsSandboxesSkillsSubagentsConfigurationTypes
Modal
Daytona
Deno
Node VFS
Sandbox Standard Tests
Vitest
Language
Theme
JavaScriptdeepagentsindexCompositeBackendconstructor
Constructor●Since v1.4

constructor

Copy
constructor(
  defaultBackend: BackendProtocol,
  routes: Record<string, BackendProtocol>
): CompositeBackend

Parameters

NameTypeDescription
defaultBackend*BackendProtocol
routes*Record<string, BackendProtocol>
View source on GitHub