Connect n8n to LINE

This recipe puts your n8n 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.

n8n runs the workflow; LangBot handles the chat platform, sessions and delivery and calls your workflow through a webhook for every message.

What you need

• A running LangBot instance: LangBot Cloud (no server needed) or a self-hosted deployment with Docker or uvx langbot.
• A n8n 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 n8n

1. Start the workflow with a Webhook or On chat message trigger. Set Response Mode to Streaming if you want streamed replies.
2. Answer with an AI Agent node (streaming) or a Respond to Webhook node whose response key matches LangBot's output key.
3. Click Active to enable the workflow and copy its production webhook URL.

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

• Empty replies: the key in Respond to Webhook must match the output key configured in LangBot.
• The test URL only works while the n8n editor is listening; use the production URL of an active workflow.
• 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 n8n 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 n8n runner guide
• Other AI back ends on LINE: Dify · Coze · Langflow · DeepSeek · OpenAI (ChatGPT models)
• n8n on other platforms: Telegram · Discord · Slack · Lark (Feishu) · DingTalk · WeCom (internal app)