Connect Dify to LINE

This recipe puts your Dify app behind a LINE bot. LangBot receives messages from LINE, runs them through a pipeline, and sends the answer back, so you do not write any platform code.

Dify builds chat assistants, Chatflows, Agents and Workflows. LangBot calls the published app through its Service API, so prompts, tools and knowledge stay in Dify.

What you need

• A running LangBot instance: LangBot Cloud (no server needed) or a self-hosted deployment with Docker or uvx langbot.
• A Dify account or instance that LangBot can reach over the network.
• A Messaging API channel in the LINE Developers Console: Channel Secret and Channel Access Token (click Issue).

Networking

LINE calls a webhook, so LangBot needs a public HTTPS URL. LangBot Cloud includes a domain and HTTPS.

1. Prepare Dify

1. Build and publish a Chat Assistant (including Chatflow), Agent or Workflow app in Dify.
2. Open the app's Access API page and create an API key.
3. For a Workflow app, output the answer under the key summary.

2. Create a pipeline

Open Pipelines in the LangBot WebUI, create a pipeline (or edit the default one) and set AI as follows. If the runner is not listed, install the official runner plugin from Plugins or the LangBot Space marketplace.

3. Create the LINE bot

1. Create a bot with the LINE adapter and enter the Channel Secret and Channel Access Token.
2. Copy the webhook callback URL from LangBot into the channel's Webhook URL, verify it, and turn on Use webhook.

4. Bind and test

Open the bot, select the pipeline you created, save and make sure the bot is enabled.

Add the official account as a friend with its QR code and send a message.

Troubleshooting

• Self-hosted Dify in Docker on the same host: put both stacks on a shared Docker network and use the container address (for example http://dify-nginx/v1), not localhost.
• Chatflow apps only return what the Answer node outputs.
• Webhook verification fails: check the URL and that HTTPS works from the public internet.
• No replies: turn off LINE's auto-reply messages in the Official Account Manager so they do not answer instead of the bot.
• Check Monitoring in the WebUI: every message, pipeline run and error is recorded there.

FAQ

Do I need a server with a public IP for LINE?

Yes, or use LangBot Cloud. LINE calls a webhook, so LangBot needs a public HTTPS URL. LangBot Cloud includes a domain and HTTPS.

Does the LINE bot support streaming replies?

Check the platform feature matrix for what this platform supports. Replies are delivered once the AI back end has finished.

Can the same Dify setup serve other platforms too?

Yes. A pipeline can be bound to many bots, so one configuration can answer on several platforms at once.

Related guides

• Full LINE setup guide
• Full Dify runner guide
• Other AI back ends on LINE: n8n · Coze · Langflow · DeepSeek · OpenAI (ChatGPT models)
• Dify on other platforms: Telegram · Discord · Slack · Lark (Feishu) · DingTalk · WeCom (internal app)