Source: https://seerepo.com/compare/langchain-ai/langchainjs/vs/novuhq/novu
Markdown source: https://seerepo.com/compare/langchain-ai/langchainjs/vs/novuhq/novu.md
Description: langchainjs and novu share 8 technologies: Express, MCP, Hono, Zod, prompts, validate-npm-package-name, handlebars, and aws-sdk. Both are written in TypeScript.

# langchainjs vs novu

langchainjs and novu share 8 technologies: Express, MCP, Hono, Zod, prompts, validate-npm-package-name, handlebars, and aws-sdk. Both are written in TypeScript.

- [langchain-ai/langchainjs](https://seerepo.com/r/langchain-ai/langchainjs): The agent engineering platform
- [novuhq/novu](https://seerepo.com/r/novuhq/novu): The open-source communication infrastructure for agents and products

## What they share and what sets them apart

- In common: Express, MCP, Hono, Zod, prompts, validate-npm-package-name, handlebars, aws-sdk
- Only in langchainjs: bson, @pinecone-database/pinecone, weaviate-client, TypeORM, langsmith, Cheerio, js-yaml, yaml, js-tiktoken, mustache, @cfworker/json-schema, @standard-schema/spec, @langchain/langgraph, langchain, @hono/node-server, @aws-sdk/credential-provider-node, @aws-sdk/types, cohere-ai, jose, groq-sdk, ollama, @azure/identity
- Only in novu: @nestjs/core, lru-cache, Redis, Sentry, NestJS, Vite, React, react-router-dom, Mixpanel, Svix, Next.js, Clerk, @aws-sdk/s3-request-presigner, ClickHouse, @azure/storage-blob, bullmq, Google Cloud, MongoDB, Anthropic, SvelteKit, H3, Solid, bcrypt, jsonwebtoken, passport-jwt, helmet, Passport, passport-github2, passport-oauth2, chat, liquidjs, entities, class-validator, class-transformer, Ajv, @nestjs/terminus, Tailwind CSS, class-variance-authority, @uiw/codemirror-themes, next-themes, tailwind-merge, tailwind-variants, React Hook Form, motion, Radix UI, uiw, sonner, tiptap, cmdk, CodeMirror, recharts, xyflow, react-confetti, @lezer/highlight, react-helmet-async, react-phone-number-input, @streamdown/code, Cal.com, react-day-picker, react-resizable-panels, @assistant-ui/react-markdown, @number-flow/react, @rjsf/core, prism-react-renderer, react-colorful, react-timezone-select, use-stick-to-bottom, react-icons, Lucide, @radix-ui/react-icons, Better Auth, @assistant-ui/react, ai, @ai-sdk/react, react-qr-code, streamdown, remark-gfm, sanitize-html, @hookform/resolvers, json-schema, rjsf, ajv-formats, sharp, mailparser, html-to-text, pino, agents, @nestjs/jwt, zod-to-json-schema, nestjs-pino, nestjs-otel, @aws-sdk/client-scheduler, opentelemetry, tippy.js, lowlight, highlight.js, @tiptap/core, juice, node-html-parser, react-email, @react-email/components, LangChain, qrcode, hast-util-to-html, mdast-util-to-hast, Vercel, PostCSS, @floating-ui/dom, @kobalte/core, ink, ora, Base UI, jwt-decode, marked, nodemailer, @aws-sdk/client-sesv2, emailjs, mailersend, postmark, sendgrid

## Side by side

| | langchainjs | novu |
|---|---|---|
| Size | 446,312 lines written, 1,388 code files | 1,214,443 lines written, 8,224 code files |
| Who writes it | 0.6% of its commits signed by AI. With Claude Code, Cursor, and GitHub Copilot | 8.2% of its commits signed by AI. With Cursor, Claude Code, Devin, GitHub Copilot, and CodeRabbit |
| Activity | Last push November 6, 2026, 7,382 commits, 18,327 stars | Last push November 6, 2026, 16,756 commits, 40,294 stars |
| Tests | 761 test files. 37.1% of its code files have a test that imports them | 1,282 test files. 16.3% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, langchainjs or novu?

novu, with 1,214,443 lines written; langchainjs has 446,312.

The proof: [novuhq/novu's code at commit e0d76b7](https://github.com/novuhq/novu/tree/e0d76b70d3880437d759ca47aee34f6ab0333a78)

### Which has more GitHub stars, langchainjs or novu?

novu, with 40,294 stars; langchainjs has 18,327.

The proof: [novuhq/novu on GitHub](https://github.com/novuhq/novu)

### Which has more tests, langchainjs or novu?

novu, with 1,282 test files; langchainjs has 761.

The proof: [novuhq/novu's code at commit e0d76b7](https://github.com/novuhq/novu/tree/e0d76b70d3880437d759ca47aee34f6ab0333a78)

### Which was updated more recently, langchainjs or novu?

Both got their last push on November 6, 2026.

The proof: [novuhq/novu's commits on GitHub](https://github.com/novuhq/novu/commits)

### Which has more commits signed by AI, langchainjs or novu?

novu: an AI signed 8.2% of its commits, with Cursor, Claude Code, Devin, GitHub Copilot, and CodeRabbit; in langchainjs, 0.6%.

The proof: [the commits each tool signed in novuhq/novu](https://seerepo.com/r/novuhq/novu/ai)

## Sources

- langchain-ai/langchainjs: Read on November 6, 2026, at commit 8103487 (https://github.com/langchain-ai/langchainjs/tree/8103487c55784c5befd84c1bc803546f720f806e)
- novuhq/novu: Read on November 6, 2026, at commit e0d76b7 (https://github.com/novuhq/novu/tree/e0d76b70d3880437d759ca47aee34f6ab0333a78)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.