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Top 23 TypeScript langchain Projects
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CopilotKit
The Frontend Stack for Agents & Generative UI. React, Angular, Mobile, Slack, and more. Makers of the AG-UI Protocol
Project mention: 15 merged IME fixes: the recurring ways Japanese typing breaks web apps | dev.to | 2026-10-06CopilotKit/CopilotKit #5764: Angular chat input submitted during composition.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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langfuse
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
Project mention: Production-Grade Observability: Agent Kernel Integrates Langfuse and OpenLLMetry | dev.to | 2026-10-06Langfuse is an open-source LLM engineering platform specialized for AI applications. It provides:
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Project mention: botpress VS CerebrumKit - a user suggested alternative | libhunt.com/r/botpress | 2026-09-20
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gateway
A blazing fast AI Gateway with integrated guardrails. Route to 1,600+ LLMs, 50+ AI Guardrails with 1 fast & friendly API.
Project mention: gateway VS bifrost - a user suggested alternative | libhunt.com/r/gateway | 2026-05-26 -
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helicone
🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓
Gateway or proxy attribution. A reverse proxy in front of the model-provider API records the request, computes the cost, and exposes per-customer breakdowns. Open-source options include Helicone, LiteLLM, Langfuse, and OpenLLMetry. Hosted equivalents serve as the AI cost observability layer for teams that want centralized visibility: LangSmith, Datadog LLM Observability, Arize Phoenix. Adds a network hop. Centralizes instrumentation across a fleet of services.
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pezzo
🕹️ Open-source, developer-first LLMOps platform designed to streamline prompt design, version management, instant delivery, collaboration, troubleshooting, observability and more.
Project mention: pezzo VS promplify-web - a user suggested alternative | libhunt.com/r/pezzo | 2026-09-02 -
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openlit
OpenLIT is the open-source agent harness engineering platform: trace, evaluate, guard, and improve everything around the model in your AI agents, on OTEL.
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ai-chatbot-framework
A python chatbot framework with Natural Language Understanding and Artificial Intelligence.
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PageLM
PageLM is a community driven version of NotebookLM & a education platform that transforms study materials into interactive resources like quizzes, flashcards, notes, and podcasts.
Project mention: Show HN: PageLM – Open-Source NotebookLM Alternative (React/Node/LangChain) | news.ycombinator.com | 2026-08-17 -
Project mention: Mirage – Unified Virtual File System for AI Agents | news.ycombinator.com | 2026-05-19
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rocketnotes
✨ AI-powered markdown editor - leverage LLMs with your documents - 100% local or in the cloud
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langtrace
Langtrace 🔍 is an open-source, Open Telemetry based end-to-end observability tool for LLM applications, providing real-time tracing, evaluations and metrics for popular LLMs, LLM frameworks, vectorDBs and more.. Integrate using Typescript, Python. 🚀💻📊
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LaunchStack
AI-powered StartUp Accelerator Engine built with Next.js, LangChain, PostgreSQL + pgvector. Upload, organize, and chat with documents. Includes predictive missing-document detection, role-based workflows, and page-level insight extraction.
Project mention: Launchstack – Open-source knowledge layer that index your docs for Claude MCP | news.ycombinator.com | 2026-04-18What Launchstack does: connect your sources once (Gmail, Notion, Drive, GitHub, Slack via Nango for 700+ APIs). A persistent knowledge graph builds continuously — entities extracted, relationships mapped, cross-source resolution automatic. Claude queries it via MCP. The graph persists across sessions. Your AI accumulates understanding instead of starting over.
I'm a JHU undergrad building this with a small team. Happy to take any advices hear about what you guys think!
GitHub: https://github.com/Deodat-Lawson/LaunchStack
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doc-chatbot
Document chatbot — multiple files, topics, chat windows and chat history. Powered by GPT.
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Magick
Magick is a cutting-edge toolkit for a new kind of AI builder. Make Magick with us! (by Oneirocom)
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semantic-search-nextjs-pinecone-langchain-chatgpt
Embeds text files into vectors, stores them on Pinecone, and enables semantic search using GPT3 and Langchain in a Next.js UI
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generative-ai-cdk-constructs
AWS Generative AI CDK Constructs are sample implementations of AWS CDK for common generative AI patterns.
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Aegis
Runtime policy enforcement for AI agents. Cryptographic audit trail, human-in-the-loop approvals, kill switch. Zero code changes. (by Justin0504)
Project mention: Show HN: Mcpsnoop – Wireshark for MCP (transparent proxy and live TUI) | news.ycombinator.com | 2026-07-03Remote debugging and post-mortem debugging support might be useful.
There are many AI auditability proxies;
awesome-auditable-ai: "A curated list of papers, tools, datasets, benchmarks, and standards for building, evaluating, and auditing reliable AI agents" https://github.com/yzhao062/awesome-auditable-ai
Aegis and LiteLLM, for example, are pre-execution firewalls that add a cryptographic audit trail. https://github.com/Justin0504/aegis
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
TypeScript langchain discussion
TypeScript langchain related posts
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Iris vs Langfuse vs Phoenix vs Promptfoo: where each wins, where each loses
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AgentGPT VS CerebrumKit - a user suggested alternative
2 projects | 20 Sep 2026 -
langfuse VS observer - a user suggested alternative
2 projects | 18 Sep 2026 -
Why Your Reranker Isn't Helping Your RAG Pipeline (And How to Prove It)
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Generative UI - The Future of Human-AI Interaction
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What is an LLM Gateway?
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5 Things That Go Horribly Wrong When You Run AI Agents Without a Gateway (And How to Stop the Bleeding)
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Oct 2026
Index
What are some of the best open-source langchain projects in TypeScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | CopilotKit | 37,700 |
| 2 | langfuse | 35,324 |
| 3 | botpress | 14,936 |
| 4 | gateway | 13,119 |
| 5 | llm-scraper | 6,938 |
| 6 | helicone | 6,192 |
| 7 | pezzo | 3,277 |
| 8 | openlit | 2,812 |
| 9 | ai-chatbot-framework | 2,165 |
| 10 | PageLM | 2,025 |
| 11 | mirage | 1,768 |
| 12 | Lumos | 1,515 |
| 13 | rocketnotes | 1,497 |
| 14 | langtrace | 1,233 |
| 15 | telegram-chatgpt-concierge-bot | 1,132 |
| 16 | LaunchStack | 890 |
| 17 | doc-chatbot | 855 |
| 18 | Magick | 847 |
| 19 | skyagi | 777 |
| 20 | semantic-search-nextjs-pinecone-langchain-chatgpt | 761 |
| 21 | generative-ai-cdk-constructs | 544 |
| 22 | ReMind | 525 |
| 23 | Aegis | 503 |
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