Developer Tools Playground

Client-side interactive tools for Markdown to PDF conversion, API testing, Base64 encoding/decoding, JSON formatting, subnet calculations, mock sample data and UUID generators.

Markdown to PDF API Tester Base64 Tool JSON Formatter Subnet Calc Generators

Markdown to PDF Converter

Mermaid & Alerts Ready

Paste Markdown with Mermaid diagrams, GitHub callouts, code blocks & tables. Preview live and print or export to clean PDF.

Quick Tools: 📂 Open .md

Preview:

Paper:

Markdown Input

0 words | 0 chars Auto-saved

Live Rendered Document Ready

100%

Your formatted document will appear here

Click "⚡ Load Implementation Plan Sample" above or start typing

Generators

PHP Arrays • PHPUnit • ECharts • UUID

Fast generators for mock PHP arrays, PHPUnit test classes & data providers, ECharts tracer bullet templates, and RFC-compliant UUIDs.

📊 Sample Data Generator 🧪 PHPUnit Test Generator 🔑 UUID Generator

Quick Presets: One-click templates or customize fields below

Settings & Output Format Sales by Month

Format

Variable Name

Row Count:

Align => arrows One item per line Round totals (e.g. 12500)

Fields Schema 2 fields

PHP Output 3 rows • ~180 B

// Generating sample data...

PHPUnit Test Presets: One-click unit test scaffolds for services, controllers, charts & data providers

Class & Framework Setup ECharts Test

Test Framework / Style

Class Under Test

Test Class Name

Namespace

declare(strict_types=1);

setUp() method DataProvider dataset Exception test case

Mock Dependencies 0 mocks

Test Methods 3 tests

PHPUnit Test Class PSR-12 Ready

// Generating PHPUnit test class...

Markdown to PDF Converter

API Tester

Base64 Encoder / Decoder

JSON Formatter & Minifier

IPv4 Subnet Calculator

Generators

Settings & Output Format Sales by Month

Class & Framework Setup ECharts Test

UUID v4 Generator