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John McLear 85f9a5f2f5
feat: Open Graph & Twitter Card metadata for pad/timeslider/home (closes #7599) (#7635)
* docs(spec): Open Graph metadata for pad pages (issue #7599)

Spec for adding og:* and twitter:card meta tags to /p/:pad,
the timeslider, and the homepage so shared links unfurl with
a useful preview in chat apps.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(spec): expand OG spec — i18n (locale map + og:locale) and a11y (image:alt)

Address review feedback: socialDescription accepts a per-language map,
og:locale is emitted from the negotiated render language, and image:alt
attributes are emitted for screen readers in chat clients.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat: emit Open Graph & Twitter Card metadata for pad/timeslider/home

Closes #7599.

Pad URLs shared in chat apps (WhatsApp, Signal, Slack, etc.) previously
unfurled with no preview because the rendered HTML carried no OG or
Twitter Card metadata. This change emits og:title, og:description,
og:image, og:url, og:site_name, og:type, og:locale, og:image:alt and
the equivalent twitter:* tags on the pad page, the timeslider, and the
homepage.

A new settings.json key `socialDescription` controls the description.
It accepts either a plain string applied to every locale or a per-language
map keyed by BCP-47 tag with an optional `default` fallback. og:locale
is emitted from the language already negotiated via req.acceptsLanguages
and og:image:alt provides screen-reader text for chat-client previews.

Pad names from the URL are HTML-escaped before being interpolated into
og:title to prevent reflected XSS via crafted pad IDs.

Tests: src/tests/backend/specs/socialMeta.ts covers the default,
per-locale override, locale fallback, URL decoding, XSS escape, and
the timeslider/homepage variants.

Semver: minor (new setting; templates emit additional tags but no
existing behavior changes).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(test): use valid pad-name char in URL-decode test

Spaces aren't allowed in pad names — Etherpad redirected /p/Has%20Space*
to a sanitized name (302), so the og:title assertion failed. Use %2D
("-") instead, which is a valid pad-name character and still exercises
the URL-decode path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(socialMeta): don't double-decode pad name from req.params.pad

Express has already URL-decoded :pad route params before they reach the
handler. Calling decodeURIComponent on the result throws URIError for
pad names containing a literal "%" — e.g. the URL /p/100%25 yields
req.params.pad === "100%", and decodeURIComponent("100%") throws.

This would have prevented the page from rendering for some valid pad
IDs. Drop the redundant decode and add a regression test for the "%"
case.

Reported by Qodo on PR #7635.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* refactor(socialMeta): source description from i18n catalog, drop settings key

Per review: the OG description is a translatable string and belongs in
Etherpad's locale files alongside the rest of the UI strings, not in
settings.json. Operators who want to override it per-language continue to
use the standard customLocaleStrings mechanism — no new config surface.

Changes:
- Add "pad.social.description" to src/locales/en.json (default English).
- Export i18n.locales so server-side renderers can look up translations.
- socialMeta.renderSocialMeta now takes a `locales` map and resolves
  renderLang → primary subtag → en, instead of taking a per-locale map
  from settings.
- Remove `socialDescription` from Settings.ts, settings.json.template,
  settings.json.docker (the key never shipped).
- Update tests and spec doc to reflect i18n-sourced description.

Reported by Qodo on PR #7635 (also confirmed feature is fine to land
default-on; no flag needed).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* test(socialMeta): add unit tests for pure helpers

21 cases exercising buildSocialMetaHtml and renderSocialMeta directly,
without HTTP/DB. Covers tag enumeration, HTML escaping, og:locale
region formatting, title composition (pad/timeslider/home), description
i18n resolution (exact/primary/en fallback, missing catalog), image URL
(default favicon vs absolute settings.favicon vs alt text), canonical
URL building with query-string stripping, the literal "%" no-throw
regression, and attribute-breakout escape.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(socialMeta): defend og:url/og:image against host-header poisoning

Previously og:url and og:image were built from req.protocol +
req.get('host'), both of which can be client-controlled (Host header
directly, or X-Forwarded-* under trust proxy). A crafted Host could
make the server emit OG tags pointing at an attacker's origin —
harmful if any cache fronts the response or if a vulnerable proxy
forwards the headers unsanitized.

Two-layer defense:

1. New optional setting `publicURL` lets operators pin the canonical
   origin used for shared link previews ("https://pad.example"). When
   set, og:url and og:image use it unconditionally. Sanitized at use
   time: must be http(s)://host[:port] with no path, no userinfo, no
   trailing slash; malformed values fall back to the request.

2. When `publicURL` is unset, the request-derived fallback now strictly
   validates the Host header against /^[a-z0-9]([a-z0-9.-]{0,253}[a-z0-9])?(:\d{1,5})?$/i
   and caps the scheme to "http"/"https". A crafted Host (CRLF
   injection, userinfo, "<script>") is replaced with "localhost"
   instead of being echoed into og:url.

Reported by Qodo on PR #7635.

Tests: 5 new unit cases covering publicURL preference, trailing-slash
strip, malformed-publicURL fallback, Host validation, scheme cap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* refactor(socialMeta): tighten types, drop `any`

- `req: any` -> express `Request` (covers acceptsLanguages/protocol/get/originalUrl).
- `settings: any` -> local `SocialMetaSettings` interface narrowed to the three
  fields we actually read (title/favicon/publicURL); avoids coupling to the
  full Settings module surface.
- `availableLangs: {[k: string]: any}` -> `{[lang: string]: unknown}`; only
  keys are read, so values stay deliberately unconstrained.

No runtime change. All 26 socialMeta unit tests still pass.

Per Sam's review on #7635.

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-01 10:43:29 +01:00
.github ci: test ep_font_color and ep_hash_auth in with-plugins matrix (#7639) 2026-05-01 09:07:24 +01:00
admin build(deps-dev): bump the dev-dependencies group with 5 updates (#7615) 2026-04-28 12:56:22 +08:00
bin chore: updated node to supported 22,24,25 (#7628) 2026-04-28 22:45:28 +02:00
doc feat(editor): add IDE-style line ops (duplicate / delete) (#7564) 2026-04-29 09:21:05 +01:00
docs/superpowers feat: Open Graph & Twitter Card metadata for pad/timeslider/home (closes #7599) (#7635) 2026-05-01 10:43:29 +01:00
local_plugins Fix installation of local plugins 2025-04-05 15:31:36 +02:00
packaging ci(packaging): publish signed apt repository to etherpad.org/apt (closes #7610) (#7624) 2026-04-29 00:20:00 +01:00
src feat: Open Graph & Twitter Card metadata for pad/timeslider/home (closes #7599) (#7635) 2026-05-01 10:43:29 +01:00
ui feat!: replace Abiword with LibreOffice and add DOCX export (#7539) 2026-04-19 09:08:22 +01:00
var Use temporary directory for esbuild 2024-11-05 20:44:27 +01:00
.dockerignore Added new command to setup etherpad. Fixed Dockerfile 2024-07-23 17:43:32 +02:00
.editorconfig Added editorconfig configuration (#6347) 2024-04-23 07:04:30 +02:00
.env.default Fixed docker compose (#6337) 2024-04-17 20:50:21 +02:00
.env.dev.default Fixed docker compose (#6337) 2024-04-17 20:50:21 +02:00
.gitattributes tests: Microsoft Windows Server CI (#4791) 2021-02-18 18:49:43 +00:00
.gitignore feat(packaging): add Debian (.deb) build via nfpm with systemd unit (v2) (#7583) 2026-04-27 10:33:30 +01:00
.npmrc fix: use hardlink package-import-method so the Docker build works on ZFS (#7342) (#7533) 2026-04-17 12:03:21 +01:00
.pr_agent.toml docs: add AGENTS.MD for AI and developer guidance (#7348) 2026-03-04 21:03:58 +00:00
AGENTS.MD chore: Rename some occurences of etherpad-lite to etherpad (#7552) 2026-04-19 16:53:57 +02:00
best_practices.md chore: Rename some occurences of etherpad-lite to etherpad (#7552) 2026-04-19 16:53:57 +02:00
CHANGELOG.md chore: updated node to supported 22,24,25 (#7628) 2026-04-28 22:45:28 +02:00
CONTRIBUTING.md chore: Rename some occurences of etherpad-lite to etherpad (#7552) 2026-04-19 16:53:57 +02:00
docker-compose.dev.yml Update docker-compose.dev.yml (#6654) 2024-09-13 08:08:56 +02:00
docker-compose.yml security: run Etherpad container as non-root user (fixes #7134) (#7287) 2026-01-10 20:28:58 +01:00
Dockerfile chore: updated node to supported 22,24,25 (#7628) 2026-04-28 22:45:28 +02:00
LICENSE Update LICENSE 2013-06-26 23:34:35 +01:00
package.json chore: updated node to supported 22,24,25 (#7628) 2026-04-28 22:45:28 +02:00
pnpm-lock.yaml build(deps): bump jsdom from 29.1.0 to 29.1.1 (#7637) 2026-04-30 22:32:37 +02:00
pnpm-workspace.yaml fix: downgrade ERR_PNPM_IGNORED_BUILDS to a warning (#7527) 2026-04-16 15:20:00 +01:00
README.md chore: updated node to supported 22,24,25 (#7628) 2026-04-28 22:45:28 +02:00
SECURITY.md Create SECURITY.md 2020-07-07 10:36:17 +01:00
settings.json.docker feat: Open Graph & Twitter Card metadata for pad/timeslider/home (closes #7599) (#7635) 2026-05-01 10:43:29 +01:00
settings.json.template feat: Open Graph & Twitter Card metadata for pad/timeslider/home (closes #7599) (#7635) 2026-05-01 10:43:29 +01:00
tests restructure: move bin/ and tests/ to src/ 2021-02-04 17:15:08 -05:00

Etherpad — the editor for documents that matter

Real-time collaborative editing where authorship is the default, your server is the only server, and you decide what AI (if any) ever touches your text.

Demo Etherpad Animated Jif

About

Etherpad is a real-time collaborative editor for documents that matter.

Every keystroke is attributed to its author. Every revision is preserved. The timeslider lets you scrub through a document's entire history, character by character. Author colours make collaboration visible at a glance — not buried in a menu.

Etherpad runs on your server, under your governance. No telemetry. No upsells. AI is a plugin you install, pointed at the model you choose, running on infrastructure you control — not a feature decided for you in a boardroom you weren't in.

The code is Apache 2.0. The data format is open. It scales to thousands of simultaneous editors per pad. Translated into 105 languages. Extended through hundreds of plugins. Used by Wikimedia, governments, public-sector institutions, and self-hosters worldwide since 2009.

Full data export is built in. The history is yours.

Try it out

Try out a public Etherpad instance

Project Status

Etherpad has been doing the same thing — well — since 2009. No pivots, no acquisitions, no enshittification. Maintained by a small volunteer team.

We are actively looking for maintainers. If you have experience with Node.js, real-time systems, or institutional collaboration tooling and you want to work on infrastructure that thousands of organisations quietly depend on, please open an issue or contact John McLear.

Code Quality

Code Quality

Testing

Backend tests Simulated Load Rate Limit Docker file Frontend admin tests powered by Sauce Labs Frontend tests powered by Sauce Labs Sauce Test Status Windows Build

Engagement

Docker Pulls Discord Etherpad plugins Languages Translation Coverage

Who uses Etherpad

For more than a decade, Etherpad has quietly underpinned the documents that matter to:

  • Wikimedia Foundation — collaborative drafting across editor communities.
  • Public-sector institutions across the EU — including organisations that legally cannot use US-cloud SaaS for sovereignty and GDPR reasons.
  • Universities and schools worldwide — including jurisdictions where Google Workspace is no longer permitted in education.
  • Civic-tech and democratic-deliberation projects — citizen assemblies, participatory budgeting, public consultations.
  • Newsrooms and investigative journalism teams — where authorship and editing history matter for legal and editorial integrity.
  • Tens of thousands of self-hosted instances worldwide, run by IT teams who chose Etherpad because it is theirs.

If your organisation runs Etherpad and would be willing to be listed publicly, please add it to the wiki.

Installation

Quick install (one-liner)

The fastest way to get Etherpad running. Requires git and Node.js >= 22.

macOS / Linux / WSL:

curl -fsSL https://raw.githubusercontent.com/ether/etherpad/master/bin/installer.sh | sh

Windows (PowerShell):

irm https://raw.githubusercontent.com/ether/etherpad/master/bin/installer.ps1 | iex

Both installers clone Etherpad into ./etherpad-lite, install dependencies, and build the frontend. When the installer finishes, run:

cd etherpad-lite && pnpm run prod

Then open http://localhost:9001.

To install and start in one go:

# macOS / Linux / WSL
ETHERPAD_RUN=1 sh -c "$(curl -fsSL https://raw.githubusercontent.com/ether/etherpad/master/bin/installer.sh)"
# Windows
$env:ETHERPAD_RUN=1; irm https://raw.githubusercontent.com/ether/etherpad/master/bin/installer.ps1 | iex

Docker-Compose

The official image is published to both Docker Hub (etherpad/etherpad) and GitHub Container Registry (ghcr.io/ether/etherpad) with identical tags. Use whichever suits your environment; GHCR avoids Docker Hub's anonymous pull rate limits.

services:
  app:
    user: "0:0"
    image: etherpad/etherpad:latest  # or: ghcr.io/ether/etherpad:latest
    tty: true
    stdin_open: true
    volumes:
      - plugins:/opt/etherpad-lite/src/plugin_packages
      - etherpad-var:/opt/etherpad-lite/var
    depends_on:
      - postgres
    environment:
      NODE_ENV: production
      ADMIN_PASSWORD: ${DOCKER_COMPOSE_APP_ADMIN_PASSWORD:-admin}
      DB_CHARSET: ${DOCKER_COMPOSE_APP_DB_CHARSET:-utf8mb4}
      DB_HOST: postgres
      DB_NAME: ${DOCKER_COMPOSE_POSTGRES_DATABASE:-etherpad}
      DB_PASS: ${DOCKER_COMPOSE_POSTGRES_PASSWORD:-admin}
      DB_PORT: ${DOCKER_COMPOSE_POSTGRES_PORT:-5432}
      DB_TYPE: "postgres"
      DB_USER: ${DOCKER_COMPOSE_POSTGRES_USER:-admin}
      # For now, the env var DEFAULT_PAD_TEXT cannot be unset or empty; it seems to be mandatory in the latest version of etherpad
      DEFAULT_PAD_TEXT: ${DOCKER_COMPOSE_APP_DEFAULT_PAD_TEXT:- }
      DISABLE_IP_LOGGING: ${DOCKER_COMPOSE_APP_DISABLE_IP_LOGGING:-false}
      SOFFICE: ${DOCKER_COMPOSE_APP_SOFFICE:-null}
      TRUST_PROXY: ${DOCKER_COMPOSE_APP_TRUST_PROXY:-true}
    restart: always
    ports:
      - "${DOCKER_COMPOSE_APP_PORT_PUBLISHED:-9001}:${DOCKER_COMPOSE_APP_PORT_TARGET:-9001}"

  postgres:
    image: postgres:15-alpine
    environment:
      POSTGRES_DB: ${DOCKER_COMPOSE_POSTGRES_DATABASE:-etherpad}
      POSTGRES_PASSWORD: ${DOCKER_COMPOSE_POSTGRES_PASSWORD:-admin}
      POSTGRES_PORT: ${DOCKER_COMPOSE_POSTGRES_PORT:-5432}
      POSTGRES_USER: ${DOCKER_COMPOSE_POSTGRES_USER:-admin}
      PGDATA: /var/lib/postgresql/data/pgdata
    restart: always
    # Exposing the port is not needed unless you want to access this database instance from the host.
    # Be careful when other postgres docker container are running on the same port
    # ports:
    #   - "5432:5432"
    volumes:
      - postgres_data:/var/lib/postgresql/data

volumes:
  postgres_data:
  plugins:
  etherpad-var:

Requirements

Node.js >= 22.

Windows, macOS, Linux

  1. Download the latest Node.js runtime from nodejs.org.
  2. Install pnpm: npm install -g pnpm (Administrator privileges may be required).
  3. Clone the repository: git clone -b master
  4. Run pnpm i
  5. Run pnpm run build:etherpad
  6. Run pnpm run prod
  7. Visit http://localhost:9001 in your browser.

Docker container

Find here information on running Etherpad in a container.

Plugins

Etherpad is very customizable through plugins.

Basic install

Full Features

Available Plugins

For a list of available plugins, see the plugins site.

Plugin Installation

You can install plugins from the admin web interface (e.g., http://127.0.0.1:9001/admin/plugins).

Alternatively, you can install plugins from the command line:

cd /path/to/etherpad-lite
pnpm run plugins i ep_${plugin_name}

Also see the plugin wiki article.

Suggested Plugins

Run the following command in your Etherpad folder to get all of the features visible in the above demo gif:

pnpm run plugins i \
  ep_align \
  ep_comments_page \
  ep_embedded_hyperlinks2 \
  ep_font_color \
  ep_headings2 \
  ep_markdown \
  ep_webrtc

For user authentication, you are encouraged to run an OpenID Connect identity provider (OP) and install the following plugins:

  • ep_openid_connect to authenticate against your OP.
  • ep_guest to create a "guest" account that has limited access (e.g., read-only access).
  • ep_user_displayname to automatically populate each user's displayed name from your OP.
  • ep_stable_authorid so that each user's chosen color, display name, comment ownership, etc. is strongly linked to their account.

Upgrade Etherpad

Run the following command in your Etherpad folder to upgrade

  1. Stop any running Etherpad (manual, systemd ...)
  2. Get present version
git -P tag --contains
  1. List versions available
git -P tag --list "v*" --merged
  1. Select the version
git checkout v2.2.5
git switch -c v2.2.5
  1. Upgrade Etherpad
./bin/run.sh
  1. Stop with [CTRL-C]
  2. Restart your Etherpad service

Next Steps

Tweak the settings

You can modify the settings in settings.json. If you need to handle multiple settings files, you can pass the path to a settings file to bin/run.sh using the -s|--settings option: this allows you to run multiple Etherpad instances from the same installation. Similarly, --credentials can be used to give a settings override file, --apikey to give a different APIKEY.txt file and --sessionkey to give a non-default SESSIONKEY.txt. Each configuration parameter can also be set via an environment variable, using the syntax "${ENV_VAR}" or "${ENV_VAR:default_value}". For details, refer to settings.json.template. Once you have access to your /admin section, settings can be modified through the web browser.

If you are planning to use Etherpad in a production environment, you should use a dedicated database such as mysql, since the dirtyDB database driver is only for testing and/or development purposes.

Secure your installation

If you have enabled authentication in users section in settings.json, it is a good security practice to store hashes instead of plain text passwords in that file. This is especially advised if you are running a production installation.

Please install ep_hash_auth plugin and configure it. If you prefer, ep_hash_auth also gives you the option of storing the users in a custom directory in the file system, without having to edit settings.json and restart Etherpad each time.

Customize the style with skin variants

Open http://127.0.0.1:9001/p/test#skinvariantsbuilder in your browser and start playing!

Skin Variant

Helpful resources

The wiki is your one-stop resource for Tutorials and How-to's.

Documentation can be found in doc/.

Development

Things you should know

You can debug Etherpad using bin/debugRun.sh.

You can run Etherpad quickly launching bin/fastRun.sh. It's convenient for developers and advanced users. Be aware that it will skip the dependencies update, so remember to run bin/installDeps.sh after installing a new dependency or upgrading version.

If you want to find out how Etherpad's Easysync works (the library that makes it really realtime), start with this PDF (complex, but worth reading).

Contributing

Read our Developer Guidelines

HTTP API

Etherpad is designed to be easily embeddable and provides a HTTP API that allows your web application to manage pads, users and groups. It is recommended to use the available client implementations in order to interact with this API.

OpenAPI (previously swagger) definitions for the API are exposed under /api/openapi.json.

jQuery plugin

There is a jQuery plugin that helps you to embed Pads into your website.

Plugin Framework

Etherpad offers a plugin framework, allowing you to easily add your own features. By default your Etherpad is extremely light-weight and it's up to you to customize your experience. Once you have Etherpad installed you should visit the plugin page and take control.

Translations / Localizations (i18n / l10n)

Etherpad comes with translations into all languages thanks to the team at TranslateWiki.

If you require translations in plugins please send pull request to each plugin individually.

FAQ

Visit the FAQ.

Get in touch

The official channel for contacting the development team is via the GitHub issues.

For responsible disclosure of vulnerabilities, please write a mail to the maintainers (a.mux@inwind.it and contact@etherpad.org).

Join the official Etherpad Discord Channel.

License

Apache License v2