Create voice assistant interface with OpenAI GPT-4o-mini and text-to-speech

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Voice Assistant Interface with n8n and OpenAI This workflow creates a voice activated AI assistant interface that runs directly in your browser. Users can click on a glowing orb to speak with the A...

Best for

Support Chatbot automation workflows
AI Chatbot automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.html, n8n-nodes-base.respondtowebhook, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.memorybufferwindow, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.stickynote, @n8n/n8n-nodes-langchain.lmchatopenai

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Anderson Adelino.

Original n8n.io source

1.1 Workflow description

Title: Create voice assistant interface with OpenAI GPT-4o-mini and text-to-speech
Workflow name: Create voice assistant interface with OpenAI GPT-4o-mini and text-to-speech

Voice Assistant Interface with n8n and OpenAI

This workflow creates a voice-activated AI assistant interface that runs directly in your browser. Users can click on a glowing orb to speak with the AI, which responds with voice using OpenAI's text-to-speech capabilities.

Who is it for?

This template is perfect for:

Developers looking to add voice interfaces to their applications
Customer service teams wanting to create voice-enabled support systems
Content creators building interactive voice experiences
Anyone interested in creating their own "Alexa-like" assistant

How it works

The workflow consists of two main parts:

Frontend Interface: A beautiful animated orb that users click to activate voice recording
Backend Processing: Receives the audio transcription, processes it through an AI agent with memory, and returns voice responses

The system uses:

Web Speech API for voice recognition (browser-based)
OpenAI GPT-4o-mini for intelligent responses
OpenAI Text-to-Speech for voice synthesis
Session memory to maintain conversation context

Setup requirements

n8n instance (self-hosted or cloud)
OpenAI API key with access to:
- GPT-4o-mini model
- Text-to-Speech API
Modern web browser with Web Speech API support (Chrome, Edge, Safari)

How to set up

Import the workflow into your n8n instance
Add your OpenAI credentials to both OpenAI nodes
Copy the webhook URL from the "Audio Processing Endpoint" node
Edit the "Voice Assistant UI" node and replace YOUR_WEBHOOK_URL_HERE with your webhook URL
Access the "Voice Interface Endpoint" webhook URL in your browser
Click the orb and start talking!

How to customize the workflow

Change the AI personality: Edit the system message in the "Process User Query" node
Modify the visual style: Customize the CSS in the "Voice Assistant UI" node
Add more capabilities: Connect additional tools to the AI Agent
Change the voice: Select a different voice in the "Generate Voice Response" node
Adjust memory: Modify the context window length in the "Conversation Memory" node

Demo

Watch the template in action: https://youtu.be/0bMdJcRMnZY

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Voice Interface Endpoint

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2

Block 2 - Voice Assistant UI

Type / Role: n8n-nodes-base.html - html
Config choices: Version 1.2

Block 3 - Send HTML Interface

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.1

Block 4 - Audio Processing Endpoint

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2

Block 5 - Process User Query

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.8

Block 6 - Conversation Memory

Type / Role: @n8n/n8n-nodes-langchain.memoryBufferWindow - memoryBufferWindow
Config choices: Version 1.3

Block 7 - Send Audio Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.1

Block 8 - Generate Voice Response

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 9 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 10 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Template Description

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 12 - Setup Instructions

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 13 - Customization Options

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 14 - GPT-4o-mini Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

3. Summary Table

Workflow	Create voice assistant interface with OpenAI GPT-4o-mini and text-to-speech
Complexity	intermediate
Nodes	14
Categories	Support Chatbot, AI Chatbot
Author	Anderson Adelino
Published	24 Jul 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/6399/6399.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Support Chatbot workflows AI Chatbot workflows

Frequently asked questions

What does Create voice assistant interface with OpenAI GPT-4o-mini and text-to-speech do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Support Chatbot, AI Chatbot use case.

Anderson Adelino

3 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.html n8n-nodes-base.respondtowebhook @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.memorybufferwindow @n8n/n8n-nodes-langchain.openai n8n-nodes-base.stickynote @n8n/n8n-nodes-langchain.lmchatopenai

Complexity

intermediate

Published 24 Jul 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/6399/6399.json

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Create voice assistant interface with OpenAI GPT-4o-mini and text-to-speech

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Voice Assistant Interface with n8n and OpenAI

Who is it for?

How it works

Setup requirements

How to set up

How to customize the workflow

Demo

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Voice Interface Endpoint

Block 2 - Voice Assistant UI

Block 3 - Send HTML Interface

Block 4 - Audio Processing Endpoint

Block 5 - Process User Query

Block 6 - Conversation Memory

Block 7 - Send Audio Response

Block 8 - Generate Voice Response

Block 9 - Sticky Note

Block 10 - Sticky Note1

Block 11 - Template Description

Block 12 - Setup Instructions

Block 13 - Customization Options

Block 14 - GPT-4o-mini Model

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions