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DeepSeek

Build a LINE AI Bot with DeepSeek

Step-by-step guide to running a DeepSeek-powered AI bot on LINE with LangBot: model setup, bot credentials, networking, testing and troubleshooting.

This recipe puts a DeepSeek model 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.

Use DeepSeek models directly with LangBot's built-in Agent: no separate agent platform needed, with optional knowledge bases, MCP tools and Skills.

What you need

Networking

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

1. Add the DeepSeek model

  1. Create an API key in the DeepSeek console.
  2. In LangBot, open Models, add an LLM model with the provider set to DeepSeek and request URL https://api.deepseek.com, then paste the API key and the model ID.
  3. Enable Tool Use if the model supports function calling; MCP tools, Skills and the sandbox need it.
  4. Typical model IDs are deepseek-chat and deepseek-reasoner; check DeepSeek's documentation for the current list.

2. Create a pipeline

Open Pipelines in the LangBot WebUI, create a pipeline (or edit the default one) and set AI as follows.

FieldValue
RunnerLocal Agent (built-in Agent)
ModelThe model you just added. You can add fallback models.
PromptInstructions: who the bot is, tone, what it must not do.
Knowledge BasesOptional. Attach a knowledge base so answers come from your documents.

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

  • 401 errors: the API key is wrong or has no balance in the DeepSeek console.
  • 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 DeepSeek setup serve other platforms too?

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

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On this page

What you needNetworking1. Add the DeepSeek model2. Create a pipeline3. Create the LINE bot4. Bind and testTroubleshootingFAQDo I need a server with a public IP for LINE?Does the LINE bot support streaming replies?Can the same DeepSeek setup serve other platforms too?Related guides