ChatGptApiDemo

This project was generated with Angular CLI version 16.0.1.

Development server

Run npm start for a dev server. Navigate to http://localhost:4200/. The application will automatically reload if you change any of the source files.

Technologies

• Angular 16
• Angular Material
• TailwindCSS
• OpenAI API

Code along:

Prerequisites

Install NodeJS: https://nodejs.org/en/download

Install GitBash or equivalent terminal to run NPM: https://git-scm.com/download/win

Install IDE to work in. Example VSCode: https://code.visualstudio.com/download

OPTIONAL: Sign up for an account on https://platform.openai.com this should give you 5$ free credits for you to use.

You can play with the API here: https://platform.openai.com/playground

Fetch the repo

git clone https://github.com/arumie/chat-gpt-api-demo.git

Go to the codealong branch

git checkout codealong

Go to the root folder of the code and install the dependencies using NPM

npm install

Install the angular CLI globally

npm install -g @angular/cli

1. Implement quote service without JSON formatting

Environment

Run the following command:

ng generate environments

Add the following to /src/environments/environment.development.ts

export const environment = {
    openai_key: '<TOKEN>'
};

Configuration

Add the following as variables to /src/app/shakespeare-quote-generator/shakespeare-quote-service.ts

configuration = new Configuration({ apiKey: environment.openai_key });
openai = new OpenAIApi(this.configuration);

System Prompt

Add the following to fetchShakespeareQuote to /src/app/shakespeare-quote-generator/shakespeare-quote-service.ts

const messages: ChatCompletionRequestMessage[] = [
  {
    role: 'system',
    content: `You will be asked for random quotes from the works of Shakespeare. You change the quote as if it was given by a ${style}. You don't use the quote 'To be or not to be'`,
  },
];

User prompt

Add to messages list:

  { role: 'user', content: `Give me a random shakespeare quote.` },

Run createChatCompletion

Add the following to fetchShakespeareQuote to /src/app/shakespeare-quote-generator/shakespeare-quote-service.ts

this.openai
  .createChatCompletion({
    model: 'gpt-4',
    messages: messages,
    temperature: 1,
    max_tokens: 1000,
  })
  .then((res) => {
    const content = res.data.choices[0].message?.content;
    if (content != null) {
      this.shakespeareQuote.set(content);
    }
  })
  .catch((err) => this.shakespeareQuoteErr.set(err))
  .finally(() => this.loading.set(false));

Edit prompt to not do To be or not to be

const messages: ChatCompletionRequestMessage[] = [
  {
    role: 'system',
    content: `You will be asked for random quotes from the works of Shakespeare. You change the quote as if it was given by a ${style}. You don't use the quote 'To be or not to be'`,
  },
];

2. Add JSON formatting

User prompt or system prompt

Add the following to the user or system prompt

  Your response should be in JSON format {styledQuote: string, originalQuote: string, play: string, act: string, scene: string}

Add QuoteData type

Add the following to /src/app/shakespeare-quote-generator/shakespeare-quote-service.ts

export type QuoteData = {
    styledQuote: string;
    originalQuote: string;
    play: string;
    act: string;
    scene: string;
};

Update shakespeareQuote type

In /src/app/shakespeare-quote-generator/shakespeare-quote-service.ts

shakespeareQuote: WritableSignal<QuoteData | null> = signal(null);

Parse content from ChatGPT

this.openai
  .createChatCompletion({
    model: 'gpt-4',
    messages: messages,
    temperature: 1,
    max_tokens: 1000,
  })
  .then((res) => {
    const content = res.data.choices[0].message?.content;
    if (content != null) {
      const quoteData = JSON.parse(content) as QuoteData;
      this.shakespeareQuote.set(quoteData);
    }
  })
  .catch((err) => this.shakespeareQuoteErr.set(err))
  .finally(() => this.loading.set(false));

Update HTML

Change the following as to /src/app/shakespeare-quote-generator/shakespeare-quote-generator.html

Use <quote-with-format></quote-with-format> instead of <quote-no-format></quote-no-format>

<quote-with-format [quote]="quote()" [style]="style ?? ''"></quote-with-format>

3. Add context in order to generate more quotes

Add shakespeareContext

private shakespeareContext: WritableSignal<ChatCompletionRequestMessage[]> = signal([]);

and use this to init the messages in ``fetchShakespeareQuote

let messages: ChatCompletionRequestMessage[];
if (this.shakespeareQuoteContext().length === 0) {
  messages = [
    {
      role: 'system',
      content: `You will be asked for random quotes from the works of Shakespeare. You change the quote as if it was given by a ${style}. You don't use the quote 'To be or not to be'`,
    },
    { role: 'user', content: `Give me a random shakespeare quote. Your response should be in JSON format {styledQuote: string, originalQuote: string, play: string, act: string, scene: string}` },
  ];
  this.shakespeareQuoteContext.set(messages);
} else {
  const prompt: ChatCompletionRequestMessage = {role: 'user', content: 'Give me the next quote in the scene'};
  this.shakespeareQuoteContext.mutate(context => context.push(prompt));
  messages = this.shakespeareQuoteContext();
}

Add result from quote to to shakespeareContext

this.openai
  .createChatCompletion({
    model: 'gpt-4',
    messages: messages,
    temperature: 1,
    max_tokens: 3000,
  })
  .then((res) => {
    const content = res.data.choices[0].message?.content;
    if (content != null) {  
      const quoteData = JSON.parse(content) as QuoteData;        
      this.shakespeareQuote.set(quoteData);
      this.shakespeareQuoteContext.mutate((context) => context.push({role: 'assistant', content}));
    }
  })
  .catch((err) => this.shakespeareQuoteErr.set(err))
  .finally(() => this.loading.set(false));