First Request

Prerequisites

MegaLLM API key (Get one here)
Python 3.7+ or Node.js 14+ installed
Basic programming knowledge

Step 1: Create Project

Python
JavaScript

# Create directory
mkdir my-first-ai-app
cd my-first-ai-app

# Create virtual environment
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install dependencies
pip install openai python-dotenv

# Create directory
mkdir my-first-ai-app
cd my-first-ai-app

# Initialize project
npm init -y

# Install dependencies
npm install openai dotenv

Step 2: Store API Key

Create a .env file:

MEGALLM_API_KEY=your-api-key-here

Add .env to .gitignore to avoid committing your API key!

Step 3: Basic Request

Python
JavaScript

Create app.py:

import os
from dotenv import load_dotenv
from openai import OpenAI

# Load environment variables
load_dotenv()

# Initialize client
client = OpenAI(
    base_url="https://ai.megallm.io/v1",
    api_key=os.getenv("MEGALLM_API_KEY")
)

# Make a request
response = client.chat.completions.create(
    model="gpt-4",
    messages=[
        {"role": "user", "content": "What is MegaLLM?"}
    ]
)

# Print response
print(response.choices[0].message.content)

Run it:

python app.py

Create app.js:

import OpenAI from 'openai';
import dotenv from 'dotenv';

// Load environment variables
dotenv.config();

// Initialize client
const client = new OpenAI({
  baseURL: 'https://ai.megallm.io/v1',
  apiKey: process.env.MEGALLM_API_KEY
});

// Make a request
const response = await client.chat.completions.create({
  model: 'gpt-4',
  messages: [
    { role: 'user', content: 'What is MegaLLM?' }
  ]
});

// Print response
console.log(response.choices[0].message.content);

Update package.json:

{
  "type": "module"
}

Run it:

node app.js

Step 4: Add Conversation Context

Let’s make it conversational:

Python
JavaScript

import os
from dotenv import load_dotenv
from openai import OpenAI

load_dotenv()

client = OpenAI(
    base_url="https://ai.megallm.io/v1",
    api_key=os.getenv("MEGALLM_API_KEY")
)

# Conversation history
messages = [
    {"role": "system", "content": "You are a helpful assistant."},
    {"role": "user", "content": "What is Python?"}
]

# First response
response = client.chat.completions.create(
    model="gpt-4",
    messages=messages
)

# Add to history
assistant_message = response.choices[0].message.content
messages.append({"role": "assistant", "content": assistant_message})
print(f"Assistant: {assistant_message}\n")

# Follow-up question
messages.append({"role": "user", "content": "What are its key features?"})

response = client.chat.completions.create(
    model="gpt-4",
    messages=messages
)

print(f"Assistant: {response.choices[0].message.content}")

import OpenAI from 'openai';
import dotenv from 'dotenv';

dotenv.config();

const client = new OpenAI({
  baseURL: 'https://ai.megallm.io/v1',
  apiKey: process.env.MEGALLM_API_KEY
});

// Conversation history
const messages = [
  { role: 'system', content: 'You are a helpful assistant.' },
  { role: 'user', content: 'What is JavaScript?' }
];

// First response
let response = await client.chat.completions.create({
  model: 'gpt-4',
  messages: messages
});

// Add to history
const assistantMessage = response.choices[0].message.content;
messages.push({ role: 'assistant', content: assistantMessage });
console.log(`Assistant: ${assistantMessage}\n`);

// Follow-up question
messages.push({ role: 'user', content: 'What are its key features?' });

response = await client.chat.completions.create({
  model: 'gpt-4',
  messages: messages
});

console.log(`Assistant: ${response.choices[0].message.content}`);

Step 5: Try Different Models

Switch models by changing the model parameter:

Python
JavaScript

models = ["gpt-4", "claude-3.5-sonnet", "gemini-2.5-pro"]

for model in models:
    print(f"\n--- Using {model} ---")
    response = client.chat.completions.create(
        model=model,
        messages=[
            {"role": "user", "content": "Explain quantum computing in one sentence."}
        ]
    )
    print(response.choices[0].message.content)

const models = ['gpt-4', 'claude-3.5-sonnet', 'gemini-2.5-pro'];

for (const model of models) {
  console.log(`\n--- Using ${model} ---`);
  const response = await client.chat.completions.create({
    model: model,
    messages: [
      { role: 'user', content: 'Explain quantum computing in one sentence.' }
    ]
  });
  console.log(response.choices[0].message.content);
}

Step 6: Add Parameters

Customize the response with parameters:

response = client.chat.completions.create(
    model="gpt-4",
    messages=[
        {"role": "user", "content": "Write a short poem about AI"}
    ],
    temperature=0.9,      # Higher = more creative
    max_tokens=100,       # Limit response length
    top_p=0.95,          # Nucleus sampling
    frequency_penalty=0.5 # Reduce repetition
)

Step 7: Error Handling

Add proper error handling:

Python
JavaScript

from openai import OpenAI, AuthenticationError, RateLimitError

try:
    response = client.chat.completions.create(
        model="gpt-4",
        messages=[{"role": "user", "content": "Hello!"}]
    )
    print(response.choices[0].message.content)

except AuthenticationError:
    print("<Icon icon="xmark" /> Invalid API key")
except RateLimitError:
    print("<Icon icon="xmark" /> Rate limit exceeded")
except Exception as e:
    print(f"<Icon icon="xmark" /> Error: {e}")

try {
  const response = await client.chat.completions.create({
    model: 'gpt-4',
    messages: [{ role: 'user', content: 'Hello!' }]
  });
  console.log(response.choices[0].message.content);

} catch (error) {
  if (error.status === 401) {
    console.log('<Icon icon="xmark" /> Invalid API key');
  } else if (error.status === 429) {
    console.log('<Icon icon="xmark" /> Rate limit exceeded');
  } else {
    console.log(`<Icon icon="xmark" /> Error: ${error.message}`);
  }
}

Step 8: Interactive Chat

Build a simple chatbot:

Python
JavaScript

import os
from dotenv import load_dotenv
from openai import OpenAI

load_dotenv()

client = OpenAI(
    base_url="https://ai.megallm.io/v1",
    api_key=os.getenv("MEGALLM_API_KEY")
)

messages = [
    {"role": "system", "content": "You are a helpful assistant."}
]

print("Chat with AI (type 'quit' to exit)\n")

while True:
    user_input = input("You: ")

    if user_input.lower() == 'quit':
        break

    messages.append({"role": "user", "content": user_input})

    response = client.chat.completions.create(
        model="gpt-4",
        messages=messages
    )

    assistant_message = response.choices[0].message.content
    messages.append({"role": "assistant", "content": assistant_message})

    print(f"AI: {assistant_message}\n")

import OpenAI from 'openai';
import dotenv from 'dotenv';
import readline from 'readline';

dotenv.config();

const client = new OpenAI({
  baseURL: 'https://ai.megallm.io/v1',
  apiKey: process.env.MEGALLM_API_KEY
});

const messages = [
  { role: 'system', content: 'You are a helpful assistant.' }
];

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

console.log("Chat with AI (type 'quit' to exit)\n");

function chat() {
  rl.question('You: ', async (userInput) => {
    if (userInput.toLowerCase() === 'quit') {
      rl.close();
      return;
    }

    messages.push({ role: 'user', content: userInput });

    const response = await client.chat.completions.create({
      model: 'gpt-4',
      messages: messages
    });

    const assistantMessage = response.choices[0].message.content;
    messages.push({ role: 'assistant', content: assistantMessage });

    console.log(`AI: ${assistantMessage}\n`);
    chat();
  });
}

chat();

Understanding the Response

The API returns a rich response object:

{
  "id": "chatcmpl-123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "gpt-4",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello! How can I help you today?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}

Next Steps

Streaming

Real-time streaming responses

Function Calling

Let AI use external tools

Browse Models

Explore all available models

Best Practices

Tips for production apps

Troubleshooting

Import errors

Make sure you installed the SDK:

pip install openai  # Python
npm install openai  # JavaScript

401 Authentication error

Check your API key is correct
Verify .env file is in the same directory
Make sure you called load_dotenv() (Python) or dotenv.config() (JS)

Rate limit errors

You’re making too many requests
Add delays between requests
Consider upgrading your plan

Slow responses

Try a faster model like gpt-3.5-turbo
Reduce max_tokens
Use streaming for better UX

Need Help?

FAQ: Common Questions
API Reference: Complete Documentation
Support: [email protected]
Discord: Join Community

Overview

Getting Started

Prerequisites

Step 1: Create Project

Step 2: Store API Key

Step 3: Basic Request

Step 4: Add Conversation Context

Step 5: Try Different Models

Step 6: Add Parameters

Step 7: Error Handling

Step 8: Interactive Chat

Understanding the Response

Next Steps

Streaming

Function Calling

Browse Models

Best Practices

Troubleshooting

Need Help?

Overview

Getting Started

​Prerequisites

​Step 1: Create Project

​Step 2: Store API Key

​Step 3: Basic Request

​Step 4: Add Conversation Context

​Step 5: Try Different Models

​Step 6: Add Parameters

​Step 7: Error Handling

​Step 8: Interactive Chat

​Understanding the Response

​Next Steps

Streaming

Function Calling

Browse Models

Best Practices

​Troubleshooting

​Need Help?

Prerequisites

Step 1: Create Project

Step 2: Store API Key

Step 3: Basic Request

Step 4: Add Conversation Context

Step 5: Try Different Models

Step 6: Add Parameters

Step 7: Error Handling

Step 8: Interactive Chat

Understanding the Response

Next Steps

Troubleshooting

Need Help?