n8n templatesn8n templates

LangChain - Example - Code Node Example

This workflow utilizes custom code nodes and the LangChain framework to demonstrate flexible interactions with OpenAI language models. By manually triggering and inputting natural language queries, users can generate intelligent responses and integrate external knowledge bases (such as Wikipedia), enabling the automation of complex tasks. It is suitable for scenarios such as intelligent Q&A chatbots, natural language interfaces, and educational assistance systems, enhancing the capabilities of automated intelligent Q&A and tool invocation to meet diverse customization needs.

Workflow Diagram
LangChain - Example - Code Node Example Workflow diagram

Workflow Name

LangChain - Example - Code Node Example

Key Features and Highlights

This workflow demonstrates how to leverage custom code nodes in conjunction with the LangChain framework to interact with OpenAI language models. It extends functionality through a self-coded LLM Chain node and custom tool nodes such as Wikipedia query integration. The workflow supports manual triggering, flexible input configuration, and can handle a variety of natural language query requests.

Core Problems Addressed

Traditional automation workflows often face limitations when integrating large language models due to single-function nodes or lack of flexibility. This workflow overcomes these challenges by using custom code nodes to flexibly construct and invoke language model requests, addressing the need for customization in complex query scenarios and enhancing capabilities in automated intelligent Q&A and tool invocation.

Application Scenarios

  • Building intelligent question-answering chatbots
  • Automating task triggers via natural language interfaces
  • Information retrieval by integrating external knowledge bases (e.g., Wikipedia)
  • AI-assisted text generation and processing
  • Developing intelligent assistants for education, customer service, and content creation

Main Workflow Steps

  1. Manually trigger the workflow start
  2. Use the “Set” node to configure natural language query inputs (examples include “Tell me a joke,” “Einstein’s birth year,” etc.)
  3. The custom “LLM Chain node” converts input into prompt templates and calls the OpenAI language model to generate responses
  4. The “Agent” node combines the Chat OpenAI model with the custom Wikipedia tool node to enable multi-tool invocation and integrated responses for complex tasks
  5. Return the final result, supporting flexible handling of multi-turn and multi-input interactions

Systems or Services Involved

  • OpenAI (for calling GPT and other language models)
  • LangChain framework (for chaining language model calls and tool integration)
  • Custom code nodes (self-developed nodes within n8n to implement complex logic)
  • Wikipedia query tool (serving as an external knowledge base to assist responses)

Target Users and Value

  • Developers needing to integrate large language models for intelligent Q&A and automation
  • Technical personnel aiming to customize AI workflows via low-code platforms
  • Enterprise automation teams seeking to improve customer service or content generation efficiency
  • Educational and research institutions building language model-based teaching aids
  • Any users looking to flexibly invoke AI models combined with external knowledge bases to realize intelligent business solutions

Centered around the self-coded LLM Chain node, this workflow harnesses OpenAI’s powerful language understanding capabilities alongside the Wikipedia knowledge query tool to enable highly customized intelligent language processing and automation. It significantly expands the scope of n8n workflows in the AI domain.