Simple Chatbot

Hello World

The real value of Dify lies in how easily you can build, deploy, and scale an idea no matter how complex. It’s built for fast prototyping, smooth iteration, and reliable deployment at any level.

Let’s start by learning reliable LLM integration into your applications. In this guide, you’ll build a simple chatbot that classifies the user’s question, respond directly using the LLM, and enhance the response with a country-specific fun fact.

Step 1: Create a New Workflow (2 min)

1. Go to Studio > Workflow > Create from Blank > Orchestrate > New Chatflow > Create

Step 2: Add Workflow Nodes (6 min)

When you want to reference any variable, type { or / first and you can see the different variables available in your workflow.

1. LLM Node and Output: Understand and Answer the Question

LLM node sends a prompt to a language model to generate a response based on user input. It abstracts away the complexity of API calls, rate limits, and infrastructure, so you can just focus on designing logic.

1. Create LLM Node

   Create an LLM node using the Add Node button and connect it to your Start node

2. Configure Model

   Choose a default model

3. Set System Prompt

   Paste this into the System Prompt field:

   The user will ask a question about a country. The question is {{sys.query}}  
   Tasks: 
   1. Identify the country mentioned. 
   2. Rephrase the question clearly. 
   3. Answer the question using general knowledge. 
   
   Respond in the following JSON format: 
   {   
     "country": "<country name>",
     "question": "<rephrased question>",
     "answer": "<direct answer to the question>" 
   }
   

4. Enable Structured Output

   Enable Structured Output allows you to easily control what the LLM will return and ensure consistent, machine-readable outputs for downstream use in precise data extraction or conditional logic.

   • Toggle Output Variables Structured ON > Configure and click Import from JSON
   • Paste:

   {   
     "country": "string",   
     "question": "string",   
     "answer": "string" 
   }
   

2. Code Block: Get Fun Fact

Code node executes custom logic using code. It lets you inject code exactly where needed—within a visual workflow—saving you from wiring up an entire backend.

1. Create Code Node

   Create a Code Node using the Add Node button and connect to LLM block

2. Configure Input Variable

   Change one Input Variable name to “country” and set the variable to structured_output > country

3. Add Python Code

   Paste this code into PYTHON3:

   def main(country: str) -> dict:     
     country_name = country.lower()     
     fun_facts = {
       "japan": "Japan has more than 5 million vending machines.",
       "france": "France is the most visited country in the world.",
       "italy": "Italy has more UNESCO World Heritage sites than any other country."     
     }     
     fun_fact = fun_facts.get(country_name, f"No fun fact available for {country.title()}.")
     return {"fun_fact": fun_fact}
   

4. Rename Output Variable

   Change output variable result to fun_fact to have a better labeled variable

3. Answer Node: Final Answer to User

Answer Node creates a clean final output to return.

1. Create Answer Node

   Create an Answer Node using the Add Node button

2. Configure Answer Field

   Paste into the Answer Field:

   Q: {{ structured_output.question }} 
   
   A: {{ structured_output.answer }} 
   
   Fun Fact: {{ fun_fact }}
   

End Workflow:

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Step 3: Test the Bot (3 min)

Click Preview, then ask:

• “What is the capital of France?”
• “Tell me about Japanese cuisine”
• “Describe the culture in Italy”
• Any other questions

Make sure your Bot works as expected!

You’ve Completed the Bot!

This guide showed how to integrate language models reliably and scalably without reinventing infrastructure. With Dify’s visual workflows and modular nodes, you’re not just building faster, you’re adopting a clean, production-ready architecture for LLM-powered apps.