# @verdaccio/middleware

> Verdaccio Express Middleware

Latest version **8.1.3** (published 2026-08-26) · MIT license · 0 weekly downloads

## Install

```sh
npm install @verdaccio/middleware
pnpm add @verdaccio/middleware
yarn add @verdaccio/middleware
bun add @verdaccio/middleware
```

## Health

**Score 70/100 (B)** — status: active.

Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score; high quality score; popular repo.

Warnings: low downloads.

Negative: declining downloads.

## Facts

| | |
|---|---|
| Version | 8.1.3 |
| Published | 2026-08-26 |
| First published | 2021-09-03 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Node | >=22 |
| Dependencies | 8 |
| Unpacked size | 224.7 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 17879 |
| Author | Juan Picado |
| Maintainers | sergiohgz, verdaccio.npm, jotadeveloper, verdacciopack |
| Keywords | enterprise, modules, package, private, proxy, registry, repository, server, verdaccio |

## Links

- npm: https://www.npmjs.com/package/@verdaccio/middleware
- Repository: https://github.com/verdaccio/verdaccio
- Homepage: https://verdaccio.org
- Issues: https://github.com/verdaccio/verdaccio/issues
- Funding: https://opencollective.com/verdaccio
- npm.io page: https://npm.io/package/@verdaccio/middleware

## Dependencies (8)

- [debug](https://npm.io/package/debug.md) 4.4.3
- [lodash](https://npm.io/package/lodash.md) 4.18.1
- [express](https://npm.io/package/express.md) 4.22.2
- [lru-cache](https://npm.io/package/lru-cache.md) 7.18.3
- [@verdaccio/url](https://npm.io/package/@verdaccio/url.md) 13.1.3
- [@verdaccio/core](https://npm.io/package/@verdaccio/core.md) 8.3.0
- [@verdaccio/config](https://npm.io/package/@verdaccio/config.md) 8.3.0
- [express-rate-limit](https://npm.io/package/express-rate-limit.md) 5.5.1

## Recent versions

- 8.1.3 (latest) — 2026-08-26
- 9.0.0-next-9.31 (next-9) — 2026-09-04
- 8.0.0-next-8.38 (next-8) — 2026-04-12
- 7.0.0-next-7.20 (next-7) — 2024-08-01
- 7.0.0-next.6 (next) — 2024-01-07
- 6.0.0-6-next.9 (6-next) — 2021-09-03
- 9.0.0-next-9.30 — 2026-08-30
- 9.0.0-next-9.29 — 2026-08-30
- 9.0.0-next-9.28 — 2026-08-26
- 9.0.0-next-9.27 — 2026-08-20
- 9.0.0-next-9.26 — 2026-08-17
- 8.1.2 — 2026-08-17
- 9.0.0-next-9.25 — 2026-08-16
- 9.0.0-next-9.24 — 2026-08-02
- 9.0.0-next-9.23 — 2026-08-02
- … 136 more at https://npm.io/package/@verdaccio/middleware/versions

## README

# @verdaccio/middleware - Verdaccio Express Middleware

[![Verdaccio Home](https://img.shields.io/badge/Homepage-Verdaccio-405236?style=flat)](https://verdaccio.org)
[![MIT License](https://img.shields.io/github/license/verdaccio/verdaccio?label=License&color=405236)](https://github.com/verdaccio/verdaccio/blob/master/LICENSE)
[![Verdaccio Latest](https://img.shields.io/npm/v/verdaccio?label=Latest%20Version&color=405236)](https://github.com/verdaccio/verdaccio)
[![This Package Latest](https://img.shields.io/npm/v/@verdaccio/middleware?label=@verdaccio/middleware&color=405236)](https://npmjs.com/package/@verdaccio/middleware)

[![Documentation](https://img.shields.io/badge/Help-Verdaccio?style=flat&logo=Verdaccio&label=Verdaccio&color=cd4000)](https://verdaccio.org/docs)
[![Discord](https://img.shields.io/badge/Chat-Discord?style=flat&logo=Discord&label=Discord&color=cd4000)](https://discord.com/channels/388674437219745793)
[![Bluesky](https://img.shields.io/badge/Follow-Bluesky?style=flat&logo=Bluesky&label=Bluesky&color=cd4000)](https://bsky.app/profile/verdaccio.org)
[![Backers](https://img.shields.io/opencollective/backers/verdaccio?style=flat&logo=opencollective&label=Join%20Backers&color=cd4000)](https://opencollective.com/verdaccio/contribute)
[![Sponsors](https://img.shields.io/opencollective/sponsors/verdaccio?style=flat&logo=opencollective&label=Sponsor%20Us&color=cd4000)](https://opencollective.com/verdaccio/contribute)

[![Verdaccio Downloads](https://img.shields.io/npm/dm/verdaccio?style=flat&logo=npm&label=Npm%20Downloads&color=lightgrey)](https://www.npmjs.com/package/verdaccio)
[![Docker Pulls](https://img.shields.io/docker/pulls/verdaccio/verdaccio?style=flat&logo=docker&label=Docker%20Pulls&color=lightgrey)](https://hub.docker.com/r/verdaccio/verdaccio)
[![GitHub Stars](https://img.shields.io/github/stars/verdaccio?style=flat&logo=github&label=GitHub%20Stars%20%E2%AD%90&color=lightgrey)](https://github.com/verdaccio/verdaccio/stargazers)

> **Note:** This package is mostly for internal use by Verdaccio and is only intended to be used with Verdaccio 6.x.

## Overview

The `@verdaccio/middleware` package provides Express middleware functions for the Verdaccio registry server. It includes request validation, logging, error handling, rate limiting, security headers, and web UI rendering.

## Installation

```bash
npm install @verdaccio/middleware
```

## Usage

```typescript
import {
  allow,
  antiLoop,
  encodeScopePackage,
  errorReportingMiddleware,
  expectJson,
  handleError,
  log,
  match,
  media,
  rateLimit,
  registerBodyParser,
  validateName,
  validatePackage,
  webMiddleware,
} from '@verdaccio/middleware';
```

### API

#### Validation & Processing

- **`validateName`** - Validates package names in route parameters
- **`validatePackage`** - Validates package identifiers
- **`media`** - Content-type media handler
- **`expectJson`** - Ensures request content-type is JSON
- **`encodeScopePackage`** - Encodes scoped package names

#### Request Control

- **`match(regexp)`** - Route matching middleware
- **`antiLoop`** - Prevents circular proxy requests
- **`allow`** - Authorization middleware
- **`rateLimit`** - Rate limiting middleware
- **`registerBodyParser(app)`** - Registers JSON body parser

#### Web UI

- **`webMiddleware()`** - Web UI Express middleware
- **`setSecurityWebHeaders(res)`** - Sets security headers for the web UI

#### Logging & Error Handling

- **`log()`** - Request logging middleware
- **`errorReportingMiddleware(logger)`** - Error reporting middleware
- **`handleError(err, req, res, next)`** - Error handler

## Donations

Verdaccio is run by **volunteers**; nobody is working full-time on it. If you find this project to be useful and would like to support its development, consider making a donation - **your logo might end up in this readme.** 😉

**[Donate](https://opencollective.com/verdaccio)** 💵👍🏻 starting from _\$1/month_ or just one single contribution.

## Report a vulnerability

If you want to report a security vulnerability, please follow the steps which we have defined for you in our [security policy](https://github.com/verdaccio/verdaccio/security/policy).

## Open Collective Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/verdaccio/contribute)]

[![sponsor](https://opencollective.com/verdaccio/sponsor/0/avatar.svg)](https://opencollective.com/verdaccio/sponsor/0/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/1/avatar.svg)](https://opencollective.com/verdaccio/sponsor/1/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/2/avatar.svg)](https://opencollective.com/verdaccio/sponsor/2/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/3/avatar.svg)](https://opencollective.com/verdaccio/sponsor/3/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/4/avatar.svg)](https://opencollective.com/verdaccio/sponsor/4/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/5/avatar.svg)](https://opencollective.com/verdaccio/sponsor/5/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/6/avatar.svg)](https://opencollective.com/verdaccio/sponsor/6/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/7/avatar.svg)](https://opencollective.com/verdaccio/sponsor/7/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/8/avatar.svg)](https://opencollective.com/verdaccio/sponsor/8/website)
[![sponsor](https://opencollective.com/verdaccio/sponsor/9/avatar.svg)](https://opencollective.com/verdaccio/sponsor/9/website)

## Open Collective Backers

Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/verdaccio/contribute)]

[![backers](https://opencollective.com/verdaccio/backers.svg?width=890)](https://opencollective.com/verdaccio/contributes)

## Special Thanks

Thanks to the following companies to help us to achieve our goals providing free open source licenses.

[![jetbrains](https://github.com/verdaccio/verdaccio/blob/master/assets/thanks/jetbrains/logo.jpg?raw=true)](https://www.jetbrains.com/)
[![crowdin](https://github.com/verdaccio/verdaccio/blob/master/assets/thanks/crowdin/logo.png?raw=true)](https://crowdin.com/)

## Contributors

This project exists thanks to all the people who contribute. [[Contribute](https://github.com/verdaccio/verdaccio/blob/master/CONTRIBUTING.md)].

[![contributors](https://opencollective.com/verdaccio/contributors.svg?width=890&button=true)](https://github.com/verdaccio/verdaccio/graphs/contributors)

## FAQ / Contact / Troubleshoot

If you have any issue you can try the following options. Do not hesitate to ask or check our issues database. Perhaps someone has asked already what you are looking for.

- [Blog](https://verdaccio.org/blog/)
- [Donations](https://opencollective.com/verdaccio)
- [Reporting an issue](https://github.com/verdaccio/verdaccio/blob/master/CONTRIBUTING.md#reporting-a-bug)
- [Running discussions](https://github.com/orgs/verdaccio/discussions)
- [Chat](https://discord.com/channels/388674437219745793)
- [Logos](https://verdaccio.org/docs/logo)
- [Docker Examples](https://github.com/verdaccio/verdaccio/tree/master/docker-examples)
- [FAQ](https://github.com/verdaccio/verdaccio/issues?utf8=%E2%9C%93&q=is%3Aissue%20label%3Aquestion%20)

## License

Verdaccio is [MIT licensed](https://github.com/verdaccio/verdaccio/blob/master/LICENSE)

The Verdaccio documentation and logos (excluding /thanks, e.g., .md, .png, .sketch files within the /assets folder) are
[Creative Commons licensed](https://creativecommons.org/licenses/by/4.0/).

---
_Source: https://npm.io/package/@verdaccio/middleware · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._