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Create Your Own AI Character Chatbot in 30 Minutes

Go beyond a simple system prompt to build an AI character chatbot that remembers users and whose relationship with them evolves, using persona design and Structured Outputs. In this 30-minute hands-on session, you’ll learn how to safely call the OpenAI API based on the provided starter project, process emotions, trust levels, and memories in a verifiable format using JSON Schema and Zod, and use an AI coding agent within defined constraints.

1 learners are taking this course

Level Basic

Course period Unlimited

Next.js
Next.js
openai
openai
agents
agents
AI
AI
LLM
LLM
Next.js
Next.js
openai
openai
agents
agents
AI
AI
LLM
LLM

What you will gain after the course

  • Implementing Model Output Validation and Relationship Map & Memory Systems Using Structured Outputs and JSON Schema

  • Maintaining Consistent AI Chatbot Behavior Through Behavior-Centered Character Persona Design and Code Separation

  • Apply a development process that keeps AI coding agents within product requirements by providing constraints and tests.

Structure emotions, memories, and trust
to create a character chatbot where relationships grow

Implement verifiable output structures yourself.


Transform inconsistent responses into emotion and memory data.
Complete the product flow with an agent equipped with constraints and tests.

openai, agents, AI Agent, Next.js, artificial intelligence (AI), vibe coding, LLM


My Own AI Character Chatbot
Create conversations where emotions and memories persist.

Go beyond unstable responses and work with the OpenAI API, agents, and structured outputs.
Validate emotions, confidence, and memories using JSON schemas and Zod.



This is not just a simple prompt example.
With behavior-driven personas and code separation,
you will complete a character chatbot whose relationships evolve.



In the starter project, design the conversation flow and
implement memory storage, emotional changes, and trust updates.
You will also directly explore the Next-based execution and deployment workflow.

From character design
to implementation with emotion and memory validation

Section 1 - Introduction to the Course and Preview of the Completed Project

Introduce the goals of the course and the overall hands-on workflow, and preview the completed AI character chatbot, whose relationship changes based on emotions, trust, and memory.

Section 2 - Implementing an AI Character Chatbot

Using the OpenAI API and Next.js, implement a character chatbot and design an action-oriented persona and system prompt. Apply structured outputs, JSON Schema, and Zod to validate emotion, trust, and memory data, and provide constraints and tests to an AI coding agent to complete consistent product behavior.

Relationship-based chatbot!

Point 1. Establishing the character's standards

Rather than stopping at a simple system prompt, design an action-oriented persona so the character maintains its settings in every conversation. By managing the character’s speaking style and decision-making criteria separately from the code, you can directly control the causes of inconsistent responses.


Point 2. Manage emotions and relationships as data

Implement a chatbot whose emotions and trust level change according to the user’s words, and whose relationship evolves as conversations accumulate. Use structured outputs, JSON schemas, and Zod to treat the model’s results as verifiable data.


Point 3. Building a chatbot that remembers

Go beyond a chatbot that generates a single response and complete a structure that remembers the information needed from conversations with users and incorporates it into subsequent interactions. Connect relationship maps and memory systems to actual operational flows to implement the core experience of character-based AI services.


Point 4. Development that controls the agent

Rather than vaguely entrusting code to an AI coding agent, you provide constraints and tests to guide its development within the product requirements. Using the provided starter project, you’ll directly connect everything from safe OpenAI API calls to validation flows, establishing practical criteria for making decisions.


Does your AI character lose its settings and relationships as the conversation progresses?

This course was created specifically for people like you.


✔️ Developers who want to improve the consistency of character chatbots

  • People who find it difficult to maintain a character using only a system prompt

  • Those who want to structure emotions and trust levels and reflect them in conversations

  • Those who want to create predictable responses using structured outputs

✔️ Developers who use AI coding tools in their work

  • Those who find that the quality and direction of generated code vary each time

  • Those who want to design constraints to ensure they stay within the requirements

  • Those who want to establish testing standards and control the AI coding process

✔️ For those planning chatbots with emotions, memory, and relationships

  • Those who want to create living characters beyond simple question-and-answer interactions

  • Those who want to treat relationship changes and user memories as verifiable data

  • For those who want to implement a fully functional product using the Next and OpenAI APIs


Build your own AI character chatbot that evolves more naturally as conversations accumulate.
Complete it yourself.

Notes Before Taking the Course


Practice Environment

  • Windows, macOS, and Linux are supported.
    OpenAI and Next.js are used.

  • You need a code editor and a modern web browser.
    At least 8 gigabytes of memory is recommended.

Prerequisites and Important Notes

  • You need experience with JavaScript fundamentals and web development.
    Experience calling application programming interfaces is helpful.

  • AI model responses should always be verified.
    Practice structured outputs and Zod syntax.

Learning materials

  • We provide PDF materials summarizing the course content.
    We also provide character designs and prompt examples.

  • Starter projects and source code for practice are provided.
    You will use JSON schemas and test examples.


Recommended for
these people

Who is this course right for?

  • Developers who have tried using the ChatGPT API but experienced unstable responses or issues with their character settings breaking down

  • Professionals who use AI coding agents but find it difficult to apply them in practice because the results vary each time

  • Planners and developers who want to build AI chatbot products equipped with emotions, memory, and relationship systems beyond simple prompts

Need to know before starting?

  • Ability to use basic JavaScript or TypeScript syntax and run code in a Node.js environment

  • Basic understanding of REST API concepts and the JSON data format

  • Experience using an LLM service such as ChatGPT or Claude at least once

Career Verified

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Learners

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4.4

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Courses

At the early-stage startup I was previously part of, I learned more than just how to write code; I learned the structure of how technology functions as a service.

Although my primary focus was on web frontend development, I took responsibility for the core service paths by designing backends and data flows whenever necessary. In particular, I built and operated a pipeline to stably collect, refine, and manage over 1 million fashion product data points using FTP/SFTP and web-based architectures.

Through this experience, I have become convinced that what matters more than any specific language or framework is the ability to understand the overall system flow and responsibility structure.

Currently, I am designing AI-based systems in web environments, focusing on defining structures and control models before execution. Rather than simply adding features, my work is closer to designing state transitions and validation flows.

Starting as a non-major and getting to this point through self-study, I am well aware of the roadblocks and realistic constraints. That is why in my lectures, I focus on "why we design this way" and "how to make decisions" rather than showing off technical skills.

A structure that leaves only the essentials,
instead of increasing complexity.

That is the development philosophy I strive for.

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Curriculum

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10 lectures ∙ (27min)

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