Essential utilities for software developers and engineers. Diagram-as-Code, formatters, and code helpers designed to streamline your daily workflow in-browser. All tools run locally in your browser — no signup or registration required.
Developer tools are essential for software engineers, designers, and web developers looking to streamline their workflow. Format and validate JSON, decode JWTs, convert between JSON, CSV, YAML, and TOML, generate mock data and UUIDs, convert timestamps, and diagram system architecture with Mermaid, all directly in your browser. All computation is done client-side, making it safe for private engineering designs, API payloads, and intellectual property.
Pick the tool for your task: paste JSON, CSV, YAML, or a JWT into the JSON Formatter, JSON to CSV Converter, YAML/TOML Converter, or JWT Decoder to instantly validate and transform it. Use the Mock Data Generator or ID Generator to produce realistic test data and UUIDs/ULIDs/NanoIDs, or the Timestamp Converter to move between epoch and human-readable dates. For diagrams, write or paste Mermaid.js code into the Diagram-as-Code editor's left panel and it renders live on the right canvas, with support for panel resizing, zoom/pan, and SVG/PNG export.
100% Browser-Based
All processing happens locally in your browser for maximum speed and privacy
No Account Needed
Start using tools immediately without signup, registration, or login
Completely Free
Unlimited usage of all features with no hidden costs or premium tiers
Cross-Platform
Works on desktop, tablet, and mobile devices with responsive design