mon[tab] Help

Dev tools in your address bar & terminal. Type mon — get results.

Getting Started

Chrome Extension

1. Type mon in the address bar
2. Press Tab (the bar changes to “mon[tab]”)
3. Type a command (e.g. uuid)
4. Press Enter — the result is copied to your clipboard

CLI

npm install -g mon-tab
mon uuid

You can also pipe input:

echo "b64 hello" | mon

Commands

Generators

uuid — Generate UUID v4

mon uuid
→ 550e8400-e29b-41d4-a716-446655440000

pw — Generate secure password

mon pw              → Xk#9mP2@vL5q!7Hn (16 chars, all character types)
mon pw 32           → 32-character password
mon pw 32 an        → 32-character, alphanumeric only
mon pw 12 n         → 12-character, numbers only
mon pw 20 a         → 20-character, letters only

Chrome extension: pw set opens the password configuration dialog.

lorem — Lorem ipsum text

mon lorem           → One sentence of lorem ipsum
mon lorem 3         → Three sentences

rand — Generate random number

mon rand            → 0.738219... (float between 0 and 1)
mon rand 100        → 42 (integer between 0 and 100)
mon rand 10 20      → 15 (integer between 10 and 20)

sha — SHA-256 hash

mon sha hello       → 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

Uses WebCrypto for native performance.

Encoding

b64 — Base64 encode

mon b64 hello       → aGVsbG8=

b64d — Base64 decode

mon b64d aGVsbG8=   → hello

jwt — Decode JWT token

mon jwt eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyIjoiYWxpY2UifQ.xxx
→ {"user":"alice"} (signature not verified)

Decodes the payload section only. Does not verify the signature.

Time

ts — Unix timestamp

mon ts              → 1741000000

Returns the current time as a Unix timestamp (seconds).

now — ISO 8601 timestamp

mon now             → 2026-03-12T14:30:45.123Z

cal — Day of the week

mon cal             → Wednesday, March 12, 2026 (today)
mon cal 2026-03-15  → Sunday, March 15, 2026

age — Age calculator

mon age 1990-05-01  → 35 years old

String

upper — Uppercase

mon upper hello world   → HELLO WORLD

lower — Lowercase

mon lower HELLO WORLD   → hello world

camel — camelCase

mon camel hello world   → helloWorld
mon camel hello-world   → helloWorld
mon camel hello_world   → helloWorld

snake — snake_case

mon snake helloWorld    → hello_world
mon snake hello world   → hello_world
mon snake hello-world   → hello_world

slug — URL slug

mon slug Hello World!   → hello-world

Removes non-alphanumeric characters and replaces spaces with hyphens.

wc — Word & character count

mon wc hello world      → 2 words, 11 chars

Math

calc — Calculator

mon calc 1920/1080      → 1920/1080 = 1.7777777778
mon calc sqrt(144)      → sqrt(144) = 12
mon calc 2^10           → 2^10 = 1024
mon calc 5!             → 5! = 120
mon calc 15% of 200     → 30
mon calc 100 + 20%      → 120

Operators: + - * / ^ (power) % (modulo) ! (factorial)

Constants: pi e

Functions: sin() cos() tan() sqrt() abs() floor() ceil() round()

Percentage syntax: 15% of 100, 100 + 20%, 100 - 20%

CLI: Supports unit conversion via math.js (e.g. calc 2 inch to cm).

ratio — Aspect ratio calculator

mon ratio 16 9 1920     → 1080 (height for 1920px wide at 16:9)
mon ratio 16 9 ? 1080   → 1920 (width for 1080px tall at 16:9)

CSS

px — px ↔ rem converter

mon px 24               → 1.5rem
mon px 1.5rem           → 24px

Base: 16px = 1rem.

Dictionary

ascii — ASCII code lookup

mon ascii A             → "A" → 65
mon ascii 65            → 65 → 'A'

Works both ways — character to code, or code to character. Range: 0–127.

http — HTTP status code

mon http 404            → 404 Not Found
mon http 201            → 201 Created

Covers status codes 100–599.

port — Well-known port lookup

mon port 443            → 443 — HTTPS
mon port 3306           → 3306 — MySQL

Includes SSH, FTP, SMTP, DNS, HTTP, HTTPS, MySQL, PostgreSQL, Redis, MongoDB, and more.

mime — MIME type lookup

mon mime png            → png → image/png
mon mime json           → json → application/json

Covers common file types: html, css, js, json, xml, pdf, images, audio, video, fonts, archives.

chmod — File permission decoder

mon chmod 755           → rwxr-xr-x (owner:rwx group:r-x other:r-x)
mon chmod 644           → rw-r--r-- (owner:rw- group:r-- other:r--)

Takes a 3–4 digit octal number.

cc — Country code lookup

mon cc JP               → [JP] Japan / JPY ¥ / +81
mon cc US               → [US] United States / USD $ / +1

Returns country name, currency, and dial code. Covers 50+ countries.

Geo

tel — Dial code lookup

mon tel +81             → +81 — Japan
mon tel 1               → +1 — United States

Covers 60+ countries.

Lookup

zip — Japanese postal code → address Chrome only

mon zip 150-0001        → 東京都渋谷区神宮前
mon zip 1000001         → 東京都千代田区千代田

Accepts 7 digits or XXX-XXXX format. Queries the zipcloud API.

Note: This is the only command that makes a network request. Chrome extension only.

Validation

email — Email address validator

mon email user@example.com      → Valid
mon email bad@@example          → Invalid: ...

Validates against RFC 5322 (simplified). Checks format, TLD, domain structure, length limits.

ip — IP address info

mon ip 192.168.1.1      → IPv4 | Class C | Private
mon ip 8.8.8.8          → IPv4 | Class A | Public
mon ip ::1              → IPv6 | Loopback

IPv4: Returns class (A–E), binary representation, scope (private, public, loopback, link-local, multicast).

IPv6: Returns type and scope.

url — URL parser

mon url https://example.com/path?q=1&lang=en#top
→ protocol: https
  host: example.com
  path: /path
  query: q=1, lang=en
  hash: top

Parses and displays all URL components.

rx — Regex tester

mon rx /\d+/g abc123def456      → 2 matches: [0] "123" @3, [1] "456" @9
mon rx /(\w+)@(\w+)/ user@host  → match: "user@host", groups: "user", "host"

Flags: g (global) i (case-insensitive) m (multiline) s (dotall) u (unicode) y (sticky)

json — JSON validator & formatter

mon json {"a":1,"b":[2,3]}
→ Valid JSON — object (2 keys)
  {
    "a": 1,
    "b": [2, 3]
  }

Validates, identifies the type, and pretty-prints. Shows error position on invalid input.

sv — Semver parse & compare

mon sv 1.2.3            → major:1 minor:2 patch:3
mon sv 1.2.3 2.0.0      → 1.2.3 < 2.0.0

Alias: semver

Emoji

em — Emoji & Gitmoji lookup

mon em fire             → 🔥
mon em rocket           → 🚀
mon em feat             → ✨ (Gitmoji: new feature)
mon em fix              → 🐛 (Gitmoji: bug fix)
mon em docs             → 📝 (Gitmoji: documentation)

Supports partial matching. Includes both standard emoji names and Gitmoji shortcuts.

Reminder

rem — Set a reminder Chrome only

mon rem 30m review PR   → Reminder set: 30 min — review PR
mon rem 1h30m meeting   → Reminder set: 90 min — meeting
mon rem 30s test        → Reminder set: 30 sec — test
mon rem ls              → List active reminders
mon rem clear           → Clear all reminders

Sends a Chrome notification when the time is up.

Variables

Variables let you store values and reuse them in other commands.

m — Set/get session variable

mon m w 1920            → w = 1920 (session)
mon m w                 → w = 1920
mon calc mw * 2         → 1920 * 2 = 3840

Session variables are cleared when the browser closes.

mp — Set persistent variable

mon mp base 16          → base = 16 (persistent)

Persistent variables survive browser restarts. Stored in chrome.storage.local (Chrome) or ~/.mon/vars.json (CLI).

ml — List all variables

mon ml                  → w=1920, base=16 (p)

Persistent variables are marked with (p).

mc — Clear variables

mon mc                  → Clear all session variables
mon mc w                → Clear specific variable
mon mc p                → Clear all persistent variables

Using variables in commands

Prefix m + variable name in any command argument:

mon m w 1920
mon calc mw / 2         → 1920 / 2 = 960

LNDF CLI only

Project snapshot commands for AI context. Requires the CLI (npm install -g mon-tab).

ld — Generate .lndf distillation

mon ld                  → Generates project snapshot

lv — Show .lndf state / query hako index

mon lv                  → Displays .lndf/current.lndf
mon lv --reindex        → Build SQLite index from hako/ frontmatter
mon lv --tag sql        → Search hako by tag
mon lv --after 2026-03  → Search hako by date
mon lv --stats          → Show index statistics

lc — Generate .lndf + copy to clipboard

mon lc                  → Generates snapshot and copies to clipboard

lt — LNDF token comparison

mon lt                  → Compare .lndf tokens vs JSON equivalent

Shows how many tokens .lndf saves compared to a full JSON representation.

clip — Read clipboard content

mon clip                → Display current clipboard content

Cross-platform clipboard reader. Works with mon lc for verify-after-copy workflow.

lp — Cross-project source collection

mon lp create myproj       → Create project in ~/.mon/projects/
mon lp add myproj file.js  → Add source to project
mon lp view myproj         → List sources with preview
mon lp dump myproj         → Concatenate all sources for LLM context
mon lp list                → List all projects

Aggregate source files across projects for LLM context injection.

System

? — List all commands

mon ?                   → List all commands grouped by category
mon ? string            → List commands in the "string" category

Categories: generators, encoding, time, string, math, css, dict, geo, lookup, validation, variable, lndf, system

opt — Open settings Chrome only

mon opt                 → Opens the extension options page

Privacy

All commands run locally in your browser. No data is collected or sent to external servers — except zip, which queries a postal code API (zipcloud.ibsnet.co.jp) with the code you enter.

No analytics, no tracking, no accounts.

Support

• GitHub: moncface/mon-tab
• Buy Me a Coffee