Transparent MCP proxy that watermarks agent tool responses and blocks data exfiltration caused by prompt injection.

Development-only error handler middleware

Native-ESM powered web dev build tool

A deep deletion module for node (like `rm -rf`)

Inspired by aws-serverless-express to work with Fastify with inject functionality.

fetch mock for jest

A composable stream processing pipeline for parsing OpenRouter/OpenAI streaming API responses. Each transform stream handles one layer of parsing and emits typed messages that flow through the pipeline.

Implementation of the AG-UI protocol for Mastra.

Ollama Javascript library

Heal broken Vercel AI SDK message arrays before they hit the provider. Fixes orphaned tool calls, missing reasoning signatures, invalid tool names, and other provider rejections.

JavaScript build tool, similar to Make or Rake

Data stream adapter for assistant-ui

Type safe utilities for throwing errors (and responses) if things aren't quite right. Inspired by npm.im/invariant

Databricks provider for Vercel AI SDK

Parses Cache-Control and other headers. Helps building correct HTTP caches and proxies

Jest matchers for asserting that HTTP responses satisfy an OpenAPI spec

The jQuery Mockjax Plugin provides a simple and extremely flexible interface for mocking or simulating ajax requests and responses.

GitHub GraphQL API client for browsers and Node

Azure AI Projects client library.

LangChain.js adapters for Model Context Protocol (MCP)