JavaScript Tools

JSTools.Space is a free, privacy-first platform containing focused utilities for common development tasks. It helps developers format and validate JSON, HTML, CSS, XML, and Markdown; encode Base64 and URLs; inspect JWTs; generate passwords, API keys, UUIDs, hashes, salts, nonces, TOTP secrets, and other authentication values; compare text; query structured data; and prototype HTML, CSS, and JavaScript. Most processing happens directly inside the browser, so users do not need to upload code, credentials, tokens, or test data to an application server. No account or project setup is required. The platform also includes a configurable Dummy Data Library, practical documentation, a developer security blog, the JSTools JSON Inspector Chrome extension, and the cross-platform JSON Studio desktop application. ### Key Features - 27 focused developer utilities - Local browser-based processing - No account or registration - Free to use - Formatters for JSON, HTML, CSS, XML, and Markdown - Password, API key, UUID, token, salt, and nonce generators - JWT decoder and hash generator - JSONPath and GraphQL query utility - Diff viewer and live HTML editor - Configurable dummy data library - Light and dark themes - Responsive keyboard-friendly interface - Documentation for every tool - Chrome JSON Inspector extension - Windows, macOS, and Linux JSON desktop application