# @rrweb/packer

> `@rrweb/packer` compresses rrweb events on the frontend before network transmission. It uses [fflate](https://github.com/101arrowz/fflate) for zlib compression and compresses each rrweb event separately as it is emitted. The encoder is needed on the recor

Latest version **2.1.7** (published 2026-10-02) · MIT license · 0 weekly downloads

## Install

```sh
npm install @rrweb/packer
pnpm add @rrweb/packer
yarn add @rrweb/packer
bun add @rrweb/packer
```

## Health

**Score 80/100 (A)** — status: active.

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

Warnings: low downloads.

## Facts

| | |
|---|---|
| Version | 2.1.7 |
| Published | 2026-10-02 |
| First published | 2024-06-13 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Dependencies | 2 |
| Unpacked size | 424.2 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 20235 |
| Maintainers | yanzhen, juice10 |
| Keywords | devtools, product-analytics, real-user-monitoring, rrweb, @rrweb/packer |

## Links

- npm: https://www.npmjs.com/package/@rrweb/packer
- Repository: https://github.com/rrweb-io/rrweb
- Homepage: https://github.com/rrweb-io/rrweb/tree/main/packages/@rrweb/packer#readme
- Issues: https://github.com/rrweb-io/rrweb/issues
- npm.io page: https://npm.io/package/@rrweb/packer

## Dependencies (2)

- [fflate](https://npm.io/package/fflate.md) ^0.4.4
- [@rrweb/types](https://npm.io/package/@rrweb/types.md) ^2.1.7

## Recent versions

- 2.1.7 (latest) — 2026-10-02
- 2.0.0-alpha.15 (alpha) — 2024-06-13
- 2.1.6 — 2026-09-18
- 2.1.5 — 2026-09-17
- 2.1.4 — 2026-09-08
- 2.1.3 — 2026-09-08
- 2.1.2 — 2026-09-08
- 2.1.1 — 2026-07-21
- 2.1.0 — 2026-06-27
- 2.0.1 — 2026-06-03
- 2.0.0 — 2026-06-01
- 2.0.0-alpha.20 — 2026-02-03
- 2.0.0-alpha.18 — 2024-12-06
- 2.0.0-alpha.17 — 2024-08-02

## README

# @rrweb/packer

## Overview

`@rrweb/packer` compresses rrweb events on the frontend before network transmission. It uses [fflate](https://github.com/101arrowz/fflate) for zlib compression and compresses each rrweb event separately as it is emitted. The encoder is needed on the recording side and adds roughly 17KB minified to your bundle (less after gzip). Decompression at replay time is handled separately via the `@rrweb/packer/unpack` entry point.

See the [storage recipe](../../docs/recipes/optimize-storage.md#compression) for more info on how it works.
And the [guide](../../guide.md) for more info on rrweb.

## Sponsors

[Become a sponsor](https://opencollective.com/rrweb#sponsor) and get your logo on our README on Github with a link to your site.

### Gold Sponsors 🥇

<div dir="auto">

<a href="https://opencollective.com/rrweb/tiers/gold-sponsor/0/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/gold-sponsor/0/avatar.svg?requireActive=false&avatarHeight=225" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/gold-sponsor/1/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/gold-sponsor/1/avatar.svg?requireActive=false&avatarHeight=225" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/gold-sponsor/2/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/gold-sponsor/2/avatar.svg?requireActive=false&avatarHeight=225" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/gold-sponsor/3/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/gold-sponsor/3/avatar.svg?requireActive=false&avatarHeight=225" alt="sponsor"></a>
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<a href="https://opencollective.com/rrweb/tiers/gold-sponsor/6/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/gold-sponsor/6/avatar.svg?requireActive=false&avatarHeight=225" alt="sponsor"></a>

</div>

### Silver Sponsors 🥈

<div dir="auto">

<a href="https://opencollective.com/rrweb/tiers/silver-sponsor/0/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/silver-sponsor/0/avatar.svg?requireActive=false&avatarHeight=158" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/silver-sponsor/1/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/silver-sponsor/1/avatar.svg?requireActive=false&avatarHeight=158" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/silver-sponsor/2/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/silver-sponsor/2/avatar.svg?requireActive=false&avatarHeight=158" alt="sponsor"></a>
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<a href="https://opencollective.com/rrweb/tiers/silver-sponsor/5/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/silver-sponsor/5/avatar.svg?requireActive=false&avatarHeight=158" alt="sponsor"></a>
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</div>

### Bronze Sponsors 🥉

<div dir="auto">

<a href="https://opencollective.com/rrweb/tiers/sponsors/0/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/0/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/sponsors/1/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/1/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>
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<a href="https://opencollective.com/rrweb/tiers/sponsors/4/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/4/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/sponsors/5/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/5/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/sponsors/6/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/6/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/sponsors/7/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/7/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>
<a href="https://opencollective.com/rrweb/tiers/sponsors/8/website?requireActive=false" target="_blank"><img src="https://opencollective.com/rrweb/tiers/sponsors/8/avatar.svg?requireActive=false&avatarHeight=70" alt="sponsor"></a>

</div>

### Backers

<a href="https://opencollective.com/rrweb#sponsor" rel="nofollow"><img src="https://opencollective.com/rrweb/tiers/backers.svg?avatarHeight=36"></a>

## Core Team Members

<table>
  <tr>
    <td align="center">
      <a href="https://github.com/Yuyz0112">
        <img
          src="https://avatars.githubusercontent.com/u/13651389?s=100"
          width="100px;"
          alt=""
        />
        <br /><sub><b>Yuyz0112</b></sub>
        <br /><br />
      </a>
    </td>
    <td align="center">
      <a href="https://github.com/YunFeng0817">
        <img
          src="https://avatars.githubusercontent.com/u/27533910?s=100"
          width="100px;"
          alt=""
        />
        <br /><sub><b>Yun Feng</b></sub>
        <br /><br />
      </a>
    </td>
    <td align="center">
      <a href="https://github.com/eoghanmurray">
        <img
          src="https://avatars.githubusercontent.com/u/156780?s=100"
          width="100px;"
          alt=""
        />
        <br /><sub><b>eoghanmurray</b></sub>
        <br /><br />
      </a>
    </td>
    <td align="center">
      <a href="https://github.com/Juice10">
        <img
          src="https://avatars.githubusercontent.com/u/4106?s=100"
          width="100px;"
          alt=""
        />
        <br /><sub><b>Juice10</b></sub>
        <br /><sub>open for rrweb consulting</sub>
      </a>
    </td>
  </tr>
</table>

## Who's using rrweb?

<table>
  <tr>
    <td align="center">
      <a href="http://www.smartx.com/" target="_blank">
        <img width="195px" src="https://raw.githubusercontent.com/rrweb-io/web/HEAD/static/logos/smartx.png" alt="SmartX">
      </a>
    </td>
    <td align="center">
      <a href="https://posthog.com?utm_source=rrweb&utm_medium=sponsorship&utm_campaign=open-source-sponsorship" target="_blank">
        <img width="195px" src="https://rrweb.com/posthog.png" alt="PostHog">
      </a>
    </td>
    <td align="center">
      <a href="https://statcounter.com/session-replay/" target="_blank">
        <img width="195px" src="https://statcounter.com/images/logo-statcounter-arc-blue.svg">
      </a>
    </td>
    <td align="center">
      <a href="https://recordonce.com/" target="_blank">
        <img width="195px" alt="Smart screen recording for SaaS" src="https://uploads-ssl.webflow.com/5f3d133183156245630d4446/5f3d1940abe8db8612c23521_Record-Once-logo-554x80px.svg">
      </a>
    </td>
  </tr>
  <tr>
    <td align="center">
      <a href="https://sentry.io" target="_blank">
        <img width="195px" src="https://rrweb.com/sentry.png" alt="Sentry">
      </a>
    </td>
    <td align="center">
      <a href="https://www.pendo.io" target="_blank">
        <img width="195px" src="https://rrweb.com/pendo.png" alt="Pendo">
      </a>
    </td>
    <td align="center">
      <a href="https://mixpanel.com" target="_blank">
        <img width="195px" src="https://rrweb.com/mixpanel.png" alt="Mixpanel">
      </a>
    </td>
    <td align="center">
      <a href="https://www.datadoghq.com" target="_blank">
        <img width="195px" src="https://rrweb.com/datadog.png" alt="Datadog">
      </a>
    </td>
  </tr>
  <tr>
    <td align="center">
      <a href="https://amplitude.com" target="_blank">
        <img width="195px" src="https://rrweb.com/amplitude.png" alt="Amplitude">
      </a>
    </td>
    <td align="center">
      <a href="https://newrelic.com" target="_blank">
        <img width="195px" src="https://rrweb.com/new%20relic.png" alt="New Relic">
      </a>
    </td>
    <td align="center">
      <a href="https://cux.io" target="_blank">
        <img style="padding: 8px" alt="The first ever UX automation tool" width="195px" src="https://cux.io/cux-logo.svg">
      </a>
    </td>
    <td align="center">
      <a href="https://remsupp.com" target="_blank">
        <img style="padding: 8px" alt="Remote Access & Co-Browsing" width="195px" src="https://remsupp.com/images/logo.png">
      </a>
    </td>
  </tr>
  <tr>
    <td align="center">
      <a href="https://highlight.io" target="_blank">
        <img style="padding: 8px" alt="The open source, fullstack Monitoring Platform." width="195px" src="https://github.com/highlight/highlight/raw/main/highlight.io/public/images/logo.png">
      </a>
    </td>
    <td align="center">
      <a href="https://analyzee.io" target="_blank">
        <img style="padding: 8px" alt="Comprehensive data analytics platform that empowers businesses to gain valuable insights and make data-driven decisions." width="195px" src="https://analyzee.io/img/analyzee-main-logo.webp">
      </a>
    </td>
    <td align="center">
      <a href="https://requestly.io" target="_blank">
        <img style="padding: 8px" alt="Intercept, Modify, Record & Replay HTTP Requests." width="195px" src="https://github.com/requestly/requestly/assets/16779465/652552db-c867-44cb-9bb5-94a2026e04ca">
      </a>
    </td>
    <td align="center">
      <a href="https://gleap.io" target="_blank">
        <img style="padding: 8px" alt="In-app bug reporting & customer feedback platform." width="195px" src="https://assets-global.website-files.com/6506f3f29c68b1724807619d/6506f56010237164c6306591_GleapLogo.svg">
      </a>
    </td>
  </tr>
  <tr>
    <td align="center">
      <a href="https://uxwizz.com" target="_blank">
        <img style="padding: 8px" alt="Self-hosted website analytics with heatmaps and session recordings." width="195px" src="https://github.com/UXWizz/public-files/raw/main/assets/logo.png">
      </a>
    </td>
    <td align="center">
      <a href="https://www.howdygo.com" target="_blank">
        <img style="padding: 8px" alt="Interactive product demos for small marketing teams" width="195px" src="https://assets-global.website-files.com/650afb446f1dd5bd410f00cc/650b2cec6188ff54dd9b01e1_Logo.svg">
      </a>
    </td>
  </tr>
</table>

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