@slackfmt/core

Convert Markdown, HTML, and other formats to Slack's Quill Delta format — the native rich text format Slack uses internally. The output preserves formatting (bold, italic, code blocks, lists, links, etc.) when pasted into Slack's compose bar.

Install

npm install @slackfmt/core

Usage

import { convert } from "@slackfmt/core";

// Auto-detect input format — result is Slack-ready Quill Delta JSON
const delta = await convert("**bold** and _italic_");

// Specify format explicitly
const delta = await convert("<b>bold</b>", { format: "html" });

Supported formats

• markdown — GitHub-flavored Markdown
• html — Generic HTML
• slack-html — Slack's clipboard HTML format

API

convert(input, options?)

Converts input text to Slack Quill Delta JSON string. Auto-detects format unless options.format is specified.

htmlToMarkdown(html)

Converts HTML to normalized Markdown.

slackHtmlToMarkdown(html)

Converts Slack's HTML clipboard format to Markdown.

quillDeltaToMarkdown(delta)

Converts Quill Delta JSON to Markdown.

markdownToDelta(markdown)

Converts Markdown to Slack Quill Delta JSON string.

normalizeMarkdown(markdown)

Normalizes Markdown through a parse/serialize round-trip.