MD Butler

MD Butler is an Obsidian plugin that automatically manages YAML frontmatter fields for all your notes. Event-driven, configurable, and a reliable alternative to Templater formulas for consistent metadata.

Features

• Event-driven metadata: Automatically update metadata on file open, modify, rename, or bulk operations
• Configurable fields: 8 built-in fields (FileName, FilePath, DateCreated, NoteType, LastModified, LastMoved, Source, Tags) plus unlimited custom fields
• Template system: Powerful {{template}} expressions with pipe-chain functions ({{title | upper | replace:a,b}})
  • Date formatting: {{date:YYYY-MM-DD}}, {{now+7d}}
  • Frontmatter access: {{frontmatter:key}}
  • File properties: {{title}}, {{fileName}}, {{fileFolder}} (alias {{folder}}), {{filePath}}, {{oldPath}}, {{oldName}}, {{oldFolder}}
  • Pipe functions: upper, lower, trim, replace:X,Y, default:VAL, substr:S,E, date:FMT
• Conditional fields: Apply fields only when conditions are met (frontmatter, path, filename, or folder rules). Auto-removes the YAML key when the condition no longer matches
• Event binding: Per-field event checkboxes (open, modify, rename, bulk)
• Folder filtering: Include or exclude entire folder trees
• Processing scope: "New notes only" (skip files with DateCreated) or "All files"
• Force apply: Overwrite all metadata across the vault
• Full repair: Force-apply → cleanup orphaned keys → consistency check — all in one command
• Do-Not-Touch list: Protect specific YAML keys from being deleted or overwritten
• YAML key migration: Automatically migrate old YAML keys to new ones when you rename a field
• Orphaned key cleanup: Remove leftover YAML keys from deleted fields
• Consistency check: Scans your vault and reports files with missing fields
• Field requirement modes: required (default) or if-exists — if-exists only flags a field when the YAML key exists but is empty (useful for fields like LastMoved that are only set under certain circumstances)
• Drag-and-drop UI: Reorder fields easily in settings

Installation

From Obsidian Community Plugins

1. Open Obsidian → Settings → Community Plugins
2. Browse and search for MD Butler
3. Install and enable it — future updates arrive automatically

Manual installation

1. Download the latest release from GitHub
2. Copy main.js, manifest.json, and styles.css to VaultFolder/.obsidian/plugins/md-butler/
3. Reload Obsidian and enable the plugin

Commands

Command	ID	Description
Apply Metadata to all Notes	md-butler:apply-all	Update metadata for all notes respecting scope & filters
Force-apply metadata to all notes	md-butler:force-apply	Overwrite all metadata fields (ignores scope)
Full repair	md-butler:full-repair	Force-apply → cleanup → consistency check
Vault Consistency Check	md-butler:check-consistency	Scan vault for missing fields
Clean up old YAML keys	md-butler:cleanup-keys	Remove orphaned YAML keys from deleted fields

Settings

Setting	Description
Date Format	Moment.js format string for all date values
Processing Mode	"New notes only" or "All files"
Metadata Fields	Drag-and-drop list of enabled fields with templates, events, and conditions
Excluded Folders	Folders to skip (when in exclude mode)
Included Folders	Folders to process (when in include mode)
Protected YAML Keys	Keys the plugin must never delete or overwrite

Field Types

Built-in fields

Field ID	YAML Key	Default Events	Description
fileName	FileName	open, rename, bulk	Current file name without extension
filePath	FilePath	open, rename, bulk	Full vault path to the file
dateCreated	DateCreated	open, rename, bulk	Date the file was first created
noteType	NoteType	open, rename, bulk	Select field: Project, Note (default), Task, Person, Meeting, Reference
lastModified	LastModified	modify, rename, bulk	Date the file was last modified
lastMoved	LastMoved	rename	Date the file was last renamed/moved (requirement: if-exists)
source	Source	open, rename, bulk	Custom field (disabled by default)
tags	Tags	modify, bulk	Custom field (disabled by default)

Select fields

Fields can be type: "text" (default) or type: "select". Select fields have:

• Configurable options[] — the allowed values (one per line in settings)
• defaultValue — set once for new notes if no template is active
• Template dropdown — pick one option to always overwrite with that value
• Smart default: when template is "(none)", the writer sets defaultValue ?? options[0] for new notes

Built-in NoteType is a select field. Create your own (Status, Priority, Area, etc.).

Custom fields

Create unlimited custom fields with:

• Custom YAML key name
• Type selection (text or select)
• Template expression or default value
• Event binding (open/modify/rename/bulk)
• Conditions for selective application
• Drag-and-drop reordering

Requirement modes

Each field has a requirement mode that controls how the Vault Consistency Check flags it:

Mode	Behavior
required (default)	Field must exist — reported as missing if the YAML key is absent
if-exists	Field is only flagged if the YAML key exists but is empty (null, "", or {})

Use if-exists for fields that are only set under certain circumstances and should not be flagged when simply absent — e.g. LastMoved (only set when a file has been moved) or optional metadata that is added later.

Template Reference

{{date:YYYY-MM-DD}}              → 2026-06-17
{{now+7d}}                       → 2026-06-24 (relative date)
{{now-1w}}                       → 2026-06-10 (relative date, supports d/w/M/y)
{{title}}                        → File name without extension
{{fileName}}                     → File name with extension
{{fileFolder}}                   → Parent folder path (alias: {{folder}})
{{filePath}}                     → Full vault path
{{oldPath}}                      → Previous path (rename events only)
{{oldFolder}}                    → Previous folder (rename events only)
{{oldName}}                      → Previous file name (rename events only)
{{frontmatter:key}}              → Value of any frontmatter key
{{title | upper}}                → UPPERCASE
{{title | lower}}                → lowercase
{{title | trim}}                 → trimmed
{{title | replace:a,b}}          → Replace all 'a' with 'b'
{{title | default:Untitled}}     → Fallback if empty
{{title | substr:0,5}}           → First 5 characters
{{date:YYYY | upper}}            → Chained: format then uppercase

Conditions Reference

Type	Operators	Description
always	—	Always apply (default)
frontmatter	exists, equals, matches, contains	Check a frontmatter key value
path	equals, matches, contains	Check file path
filename	equals, matches, contains	Check file name
folder	equals, matches, contains	Check parent folder

Fields with conditions are auto-removed from frontmatter when their condition no longer matches — the YAML key is deleted on the next event that triggers a write.

Development

# Clone the repo
git clone https://github.com/PPeapps/MD-Butler
cd md-butler

# Install dependencies
npm install

# Development (watch mode)
npm run dev

# Production build
npm run build

# Lint
npm run lint

Requirements

• Obsidian v1.8.0 or later
• No external dependencies (uses Obsidian API only)

License

MIT