Source: https://seerepo.com/r/bytedance/deer-flow/built
Markdown source: https://seerepo.com/r/bytedance/deer-flow/built.md
Description: deer-flow is a Python repo built with Next.js, React, and FastAPI. It has 1,494 files and 1,060,520 written lines, with 1,847 test files.

# What is deer-flow built with?

deer-flow is a Python repo built with Next.js, React, and FastAPI. It has 1,494 files and 1,060,520 written lines, with 1,847 test files.

Read on October 27, 2026, at commit dbd72df.

Repository: https://github.com/bytedance/deer-flow

## Frontend

### The base

- **Next.js**: [in package.json](https://github.com/bytedance/deer-flow/blob/dbd72df40558f5f2d352885349ba1d7f2b7dbd7e/package.json)
- **[React](https://seerepo.com/uses/react)**: [in package.json](https://github.com/bytedance/deer-flow/blob/dbd72df40558f5f2d352885349ba1d7f2b7dbd7e/package.json)

## Backend

### The base

- **[FastAPI](https://seerepo.com/uses/fastapi)**: [in package.json](https://github.com/bytedance/deer-flow/blob/dbd72df40558f5f2d352885349ba1d7f2b7dbd7e/package.json)

## Other repos with a similar stack

- [react/react](https://seerepo.com/r/react/react/built): Next.js, React
- [langflow-ai/langflow](https://seerepo.com/r/langflow-ai/langflow/built): React, FastAPI
- [yangshun/tech-interview-handbook](https://seerepo.com/r/yangshun/tech-interview-handbook/built): Next.js, React
- [shadcn-ui/ui](https://seerepo.com/r/shadcn-ui/ui/built): Next.js, React
- [supabase/supabase](https://seerepo.com/r/supabase/supabase/built): Next.js, React
- [microsoft/Web-Dev-For-Beginners](https://seerepo.com/r/microsoft/Web-Dev-For-Beginners/built): Next.js, React

## Frequently asked questions

### What language is deer-flow written in?

deer-flow is written in Python: 1,494 files and 1,060,520 written lines.

### What framework does deer-flow use?

deer-flow is built with Next.js, React, and FastAPI.

The proof: [in package.json](https://github.com/bytedance/deer-flow/blob/dbd72df40558f5f2d352885349ba1d7f2b7dbd7e/package.json)

### Does deer-flow have tests?

Yes. deer-flow has 1,847 test files.

### Which repos have a stack like deer-flow's?

The ones that share most of its stack: react/react, langflow-ai/langflow, and yangshun/tech-interview-handbook.

## 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.