WebAssembly

Universal LLM API client for browsers and WebAssembly runtimes. Access 142+ LLM providers with portable deployment across browsers, Deno, and Cloudflare Workers.

Installation

Package Installation

Install via one of the supported package managers:

npm:

npm install @kreuzberg/liter-llm-wasm

pnpm:

pnpm add @kreuzberg/liter-llm-wasm

yarn:

yarn add @kreuzberg/liter-llm-wasm

System Requirements

• Modern browser with WebAssembly support, or Deno 1.0+, or Cloudflare Workers
• API keys via environment variables or runtime configuration

Quick Start

Basic Chat

Send a message to any provider using the provider/model prefix:

import init, { LlmClient } from "@kreuzberg/liter-llm-wasm";

await init();

const client = new LlmClient({ apiKey: "sk-..." });
const response = await client.chat({
  model: "openai/gpt-4o",
  messages: [{ role: "user", content: "Hello!" }],
});

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

Common Use Cases

Streaming Responses

Stream tokens in real time:

import init, { LlmClient } from "@kreuzberg/liter-llm-wasm";

await init();

const client = new LlmClient({ apiKey: "sk-..." });
const stream = await client.chatStream({
  model: "openai/gpt-4o-mini",
  messages: [{ role: "user", content: "Hello" }],
});
// stream is a ReadableStream

Next Steps

• Provider Registry - Full list of supported providers
• GitHub Repository - Source, issues, and discussions

Features

Supported Providers (142+)

Route to any provider using the provider/model prefix convention:

| Provider | Example Model | |----------|--------------| | OpenAI | openai/gpt-4o, openai/gpt-4o-mini | | Anthropic | anthropic/claude-3-5-sonnet-20241022 | | Groq | groq/llama-3.1-70b-versatile | | Mistral | mistral/mistral-large-latest | | Cohere | cohere/command-r-plus | | Together AI | together/meta-llama/Meta-Llama-3.1-70B-Instruct-Turbo | | Fireworks | fireworks/accounts/fireworks/models/llama-v3p1-70b-instruct | | Google Vertex | vertexai/gemini-1.5-pro | | Amazon Bedrock | bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0 |

Complete Provider List

Key Capabilities

• Provider Routing -- Single client for 142+ LLM providers via provider/model prefix

• Unified API -- Consistent chat, chat_stream, embeddings, list_models interface

• Streaming -- Real-time token streaming via chat_stream

• Tool Calling -- Function calling and tool use across all supporting providers

• Type Safe -- Schema-driven types compiled from JSON schemas

• Secure -- API keys never logged or serialized, managed via environment variables

• Observability -- Built-in OpenTelemetry with GenAI semantic conventions

• Error Handling -- Structured errors with provider context and retry hints

Performance

Built on a compiled Rust core for speed and safety:

• Provider resolution at client construction -- zero per-request overhead
• Configurable timeouts and connection pooling
• Zero-copy streaming with SSE and AWS EventStream support
• API keys wrapped in secure memory, zeroed on drop

Provider Routing

Route to 142+ providers using the provider/model prefix convention:

openai/gpt-4o
anthropic/claude-3-5-sonnet-20241022
groq/llama-3.1-70b-versatile
mistral/mistral-large-latest

See the provider registry for the full list.

Proxy Server

liter-llm also ships as an OpenAI-compatible proxy server with Docker support:

docker run -p 4000:4000 -e LITER_LLM_MASTER_KEY=sk-your-key ghcr.io/kreuzberg-dev/liter-llm

See the proxy server documentation for configuration, CLI usage, and MCP integration.

Documentation

• Documentation -- Full docs and API reference
• GitHub Repository -- Source, issues, and discussions
• Provider Registry -- 142 supported providers

Part of kreuzberg.dev.

Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

Join our Discord community for questions and discussion.

License

MIT -- see LICENSE for details.