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snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)
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<!--header-->
<p align="center">
<a href="https://rocket.chat" title="Rocket.Chat">
<img src="https://github.com/RocketChat/Rocket.Chat.Artwork/raw/master/Logos/2020/png/logo-horizontal-red.png" alt="Rocket.Chat" />
</a>
</p>
# `@rocket.chat/message-parser`
> Rocket.Chat parser for messages
---
[![npm@latest](https://img.shields.io/npm/v/@rocket.chat/message-parser/latest?style=flat-square)](https://www.npmjs.com/package/@rocket.chat/message-parser/v/latest) [![npm@next](https://img.shields.io/npm/v/@rocket.chat/message-parser/next?style=flat-square)](https://www.npmjs.com/package/@rocket.chat/message-parser/v/next) ![npm downloads](https://img.shields.io/npm/dw/@rocket.chat/message-parser?style=flat-square) ![License: MIT](https://img.shields.io/npm/l/@rocket.chat/message-parser?style=flat-square)
![deps](https://img.shields.io/librariesio/release/npm/@rocket.chat/message-parser?style=flat-square) ![npm bundle size](https://img.shields.io/bundlephobia/min/@rocket.chat/message-parser?style=flat-square)
<!--/header-->
## Description
Rocket.Chat grammar with the purpose of parsing the messages of the rocket chat, converting text to an AST tree.
The grammar provides support for markdown, mentions and emojis.
## Supported markup
- quotes
- bold/italic/strike
- ordered lists
- unordered lists
- task lists
- phone numbers
- mentions
- emoji
- colors
- URI's
- mentions users/channels
- timestamps
- tables
## Tables
GFM-style tables. A leading and trailing pipe is required on every row.
Alignment is taken from the delimiter row:
| Marker | Alignment |
| ------ | --------- |
| `:---` | left |
| `:--:` | center |
| `---:` | right |
| `---` | none |
```md
| Header 1 | Header 2 |
| -------- | :------: |
| Cell 1 | Cell 2 |
```
A literal pipe inside a cell must be escaped as `\|`. Cell content supports
inline markup (bold, italic, links, emoji, …).
## Timestamps
The timestamp tag is a special tag that allows you to convert a Unix timestamp to a human-readable date and time.
Timestamps are allowed inside strike elements.
### Usage
Pattern: <t:{timestamp}:?{format}>
- {timestamp} is a Unix timestamp
- {format} is an optional parameter that can be used to customize the date and time format.
#### Formats
| Format | Description | Example |
| ------ | ------------------------- | --------------------------------------- |
| `t` | Short time | 12:00 AM |
| `T` | Long time | 12:00:00 AM |
| `d` | Short date | 12/31/2020 |
| `D` | Long date | Thursday, December 31, 2020 |
| `f` | Full date and time | Thursday, December 31, 2020 12:00 AM |
| `F` | Full date and time (long) | Thursday, December 31, 2020 12:00:00 AM |
| `R` | Relative time | 1 year ago |
## Contributing
<!--contributing(msg)-->
Contributions, issues, and feature requests are welcome!<br />
Feel free to check the [issues](https://github.com/RocketChat/fuselage/issues).
<!--/contributing(msg)-->
Whenever you find a grammar-related bug, start by inserting the test case.
We are open to other tags/markups, as long as they don't generate unexpected behavior.
## Observations and known issues
- Nested lists are unsupported
- `URL` rule doesn't allow whitespace, `(`, or `)`