DevToolbox CLI

25+ developer tools in your terminal. Generate mock data from TypeScript interfaces, hash strings, encode/decode, convert timestamps, and more.

Install

npm install -g devtk

Or use without installing:

npx devtk mock "export type User = { name: string; email: string; }"

🎲 Mock Data Generator — The Flagship Feature

Generate realistic mock data directly from TypeScript interfaces:

devtk mock 'export type User = {
  id: string;
  name: string;
  email: string;
  age: number;
  isActive: boolean;
  createdAt: string;
}'

Output:

[
  {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "name": "Sarah Chen",
    "email": "[email protected]",
    "age": 28,
    "isActive": true,
    "createdAt": "2025-09-15"
  }
]

Smart Type Inference

You don't need to specify generators — it detects field names automatically:

| Field Name | Generates | Field Name | Generates | |------------|-----------|------------|-----------| | id, *Id | UUID | email | real emails | | name, firstName | real names | phone | phone numbers | | startTime/endTime | datetime | price/amount | $currency | | isActive/enabled | boolean | status | status strings | | city | city names | company | company names | | createdAt | date | imageUrl/avatar | image URLs | | title | sentences | description | paragraphs | | ...and 30+ more | | | |

Your Exact Use Case

# TypeScript interface → instant mock data
devtk mock 'export type TIntervalQueryS2E = {
  startTime: string;
  endTime: string;
};' -n 3

[
  { "startTime": "2025-09-15T14:23:41Z", "endTime": "2026-01-28T08:45:12Z" },
  { "startTime": "2025-06-03T19:12:55Z", "endTime": "2025-11-19T22:33:08Z" },
  { "startTime": "2026-02-14T06:55:30Z", "endTime": "2025-08-22T11:28:47Z" }
]

Output Formats

# JSON (default)
devtk mock "export type User = { name: string; }" -f json

# CSV
devtk mock "export type Product = { id: string; price: string; }" -f csv

# SQL INSERT statements
devtk mock "export type Order = { orderId: string; amount: string; }" -f sql

# TypeScript interface + data
devtk mock "export type User = { name: string; }" -f typescript

Pipe from Files

# Read from a file
devtk mock ./types.ts

# Pipe from stdin
cat types.ts | devtk mock --count 20

Reproducible Data

# Same seed = same data every time
devtk mock "export type User = { name: string; }" --seed 42

All Commands

Mock Data

devtk mock <interface>    # Generate mock data
  -n, --count <number>        # Number of rows (default: 5)
  -f, --format <format>        # json, csv, sql, typescript
  -s, --seed <number>          # Seed for reproducible data

Hash

devtk hash "hello world"
# SHA-1:   2aae6c35...
# SHA-256: b94d27b9...
# SHA-512: 309ecc48...

Base64

devtk base64 encode "hello"    # aGVsbG8=
devtk base64 decode "aGVsbG8="  # hello

UUID

devtk uuid              # Generate 1 UUID
devtk uuid -n 5         # Generate 5 UUIDs
devtk uuid -n 3 -u      # 3 uppercase UUIDs

Timestamp

devtk timestamp                    # Current Unix timestamp
devtk timestamp -c 1712923200     # Convert Unix → human
devtk timestamp -d "2024-01-15"    # Convert date → Unix

URL

devtk url encode "hello world & foo=bar"   # hello%20world%20%26%20foo%3Dbar
devtk url decode "hello%20world"            # hello world

Slug

devtk slug "Hello World! 2026 🎉"  # hello-world-2026
devtk slug "My Blog Post" -s _       # my_blog_post

Number Base

devtk base 42           # 42 in decimal → binary, octal, hex
devtk base ff -f 16     # 0xFF → all bases
devtk base 1010 -f 2    # binary → all bases

Cron

devtk cron "0 9 * * 1"      # Runs on Monday, at 09:00
devtk cron "*/15 * * * *"    # Runs every 15 minutes

JWT Decode

devtk jwt eyJhbGciOiJIUzI1NiJ9.eyJzdWIi...
# Decodes header + payload + shows expiry

Lorem Ipsum

devtk lorem                   # 3 paragraphs
devtk lorem -n 5 -t sentences  # 5 sentences
devtk lorem -n 50 -t words    # 50 words

Web Version

Try all 26 tools in your browser: devtk-app.web.app

License

MIT © Askin John Samuel