With Node.js/Bun/Deno

Adding environment variables

By default, LlamaIndex uses OpenAI provider, which requires an API key. You can set the OPENAI_API_KEY environment variable to authenticate with OpenAI.

export OPENAI_API_KEY=your-api-key

Or you can use a .env file:

echo "OPENAI_API_KEY=your-api-key" > .env
node --env-file .env your-script.js

For more information, see the How to read environment variables from Node.js.

Performance Optimization

By the default, we are using js-tiktoken for tokenization. You can install gpt-tokenizer which is then automatically used by LlamaIndex to get a 60x speedup for tokenization:

npm install gpt-tokenizer

Note: This only works for Node.js

TypeScript support