Source: https://seerepo.com/r/langchain-ai/langchainjs
Markdown source: https://seerepo.com/r/langchain-ai/langchainjs.md
Description: langchain-ai/langchainjs is a TypeScript repo with 446,312 lines written. langchainjs is built with Express and Hono and uses MCP.

# What's inside langchain-ai/langchainjs

langchain-ai/langchainjs is a TypeScript repo with 446,312 lines written. langchainjs is built with Express and Hono and uses MCP. AI signed 0.6% of the 7,382 commits of langchainjs.

Its description on GitHub: “The agent engineering platform”

TypeScript · MIT · 18,327 stars · GitHub: https://github.com/langchain-ai/langchainjs

Read on November 6, 2026, at commit 8103487.

## More on this repo

- [What is langchainjs built with?](https://seerepo.com/r/langchain-ai/langchainjs/built): langchainjs is built with Express and Hono and uses MCP.
- [How much of langchainjs did AI write?](https://seerepo.com/r/langchain-ai/langchainjs/ai): AI signed 0.6% of the 7,382 commits of langchainjs.

## In figures

- 446,312 lines written: The ones people and agents wrote: product, tests, schemas and tooling. Generated code doesn’t count.
- 1,388 files: The same as the lines: product, tests, schemas and tooling. What’s generated doesn’t count.
- 761 test files: The files that test the code.
- 30 technologies: Each service with the file and line that prove it.

SeeRepo read the facts in its code and kept none of it. AI only helps sort its packages and folders by their names, and never sees its code.

## Frequently asked questions

### What is langchain-ai/langchainjs?

langchain-ai/langchainjs is a TypeScript repo with 446,312 lines written. Its description on GitHub: “The agent engineering platform”

The proof: [its page on GitHub](https://github.com/langchain-ai/langchainjs)

### What is langchainjs built with?

langchainjs is built with Express and Hono and uses MCP.

The proof: [each service with its file and line](https://seerepo.com/r/langchain-ai/langchainjs/built)

### How much of langchainjs did AI write?

AI signed 0.6% of the 7,382 commits of langchainjs.

The proof: [the commits each tool signed](https://seerepo.com/r/langchain-ai/langchainjs/ai)

### What license does langchainjs have?

langchainjs is released under the MIT license.

The proof: [its page on GitHub](https://github.com/langchain-ai/langchainjs)

### How many stars does langchainjs have on GitHub?

langchainjs had 18,327 stars on GitHub on November 6, 2026.

The proof: [its page on GitHub](https://github.com/langchain-ai/langchainjs)

## Add this badge to your README

It links to this page and updates itself each time SeeRepo reads the repo.

```markdown
[![langchain-ai/langchainjs on SeeRepo](https://seerepo.com/badge/langchain-ai/langchainjs.svg)](https://seerepo.com/r/langchain-ai/langchainjs?de=insignia)
```

## 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.