About Playground App
Playground App is a premium, client-side developer utility platform designed to solve daily engineering tasks. By combining security, speed, and elegance, we provide a local sandbox where your sensitive parameters remain completely yours.
Privacy & Security Architecture
Standard online tools process your inputs, JWT secrets, database queries, and credentials on their backend servers. This introduces severe security hazards and potential leaks. Playground App operates differently: we guarantee that 100% of the computation happens in your local browser sandbox.
Designed for Modern Workflows
We focus on building developer utilities that don't just format or generate, but actively analyze your code. From auditing SQL performance and detecting dangerous patterns to parsing claims inside JSON Web Tokens, our platform serves as a smart assistant built directly into your desktop ecosystem.
Our Modular Ecosystem
Deep-dive into each specialized utility we provide in the browser.
Scratchpad Workspace
A powerful scratchpad that lets you quickly compose, edit, and keep track of .env parameters, JSON documents, SQL scripts, or bash commands.
Fast local storage persistence with zero external server syncing.
Launch ToolJWT Decoder & Inspector
Directly analyze, verify, and audit JSON Web Tokens. Parse headers, claims, signature algorithm status, and lifespan expiration progress.
Safely verify signatures with private keys without risking key exposure.
Launch ToolcURL Builder & API Playground
Import cURL commands, configure basic auth, API keys, headers, query parameters, request bodies, custom variables, and execute validations.
Run API queries locally with auto-chaining response variables.
Launch ToolSQL Formatter & Query Analyzer
Format SQL statements using different dialects like MySQL, PostgreSQL, SQLite, or SQL Server. Audit queries for security, dangerous operations, and nesting depth.
Analyze performance and security issues before running queries in production.
Launch ToolRandom Secret Generator
Generate high-entropy cryptographically secure random bytes in hex, base64, and string formats.
Uses secure native browser window.crypto libraries.
Launch ToolPassword Generator
Create customized secure passwords using customizable configuration options like symbols, numbers, and uppercase characters.
Completely client-side generation ensures absolute secrecy.
Launch ToolBase64 Generator
Convert plain text data to Base64 standard format or decode existing Base64 strings instantly.
Performs instant encoding and decoding inside your local sandbox.
Launch ToolUUID Generator
Generate universally unique identifiers (UUID v4) instantly for database keys or request IDs.
Supports bulk generation of standards-compliant random UUIDs.
Launch ToolSHA256 Generator
Compute secure hash algorithms (SHA-256) for documents, payloads, credentials, or checking integrity.
Instant browser computation with native Web Crypto APIs.
Launch ToolJSON ⇄ PHP Array Converter
Seamlessly convert complex nested JSON objects into associative PHP arrays and vice versa.
Saves time when refactoring backend code structures.
Launch Tool