Input JSON
LocalUsta is currently in beta and all tools are free. Some advanced features may become part of a paid plan in the future; we aim to keep the core tools accessible to everyone.
Terms of Service →Secure and Local JSON Processing
Beautify nested structures with customizable indentation sizes and detect missing elements or syntax errors instantly with real-time editor alerts.
Convert parsed JSON structures into readable YAML configurations or standard XML documents cleanly without needing separate tools.
Instantly translate complex JSON objects into strongly-typed TypeScript interfaces to accelerate your application development process.
Our system automatically detects Base64 encoded strings, prompts a one-click decode, and formats the inner JSON structure if present.
Uploading JSON files containing proprietary configurations, API credentials, or database records to public web tools is a major security risk. LocalUsta JSON Prettier guarantees 100% data isolation by running all formatting, syntax checking, and multi-format exports locally in your browser memory. No tracking cookies are used for data, and zero network bytes are transmitted.
Everything you need to know about the LocalUsta Tools platform.
Convert between CSV and JSON formats locally in your browser with separator selection and parsing options.
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Professional video editing and conversion directly in your browser with FFmpeg.wasm.
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A high-fidelity unit conversion tool for developers. Convert Data, Time, and CSS units (PX to REM/EM) instantly.
Build, test, and master regular expressions with a comprehensive cheat sheet and real-time match highlighting.
Generate and verify MD5, SHA, BLAKE3, CRC32 and Argon2 hashes for text and files.
Generate highly secure passwords and measure their strength offline.
Generate, parse, verify, and benchmark Bcrypt and Argon2 password hashes safely in your browser. 100% private.
A secure scratchpad that runs entirely in your browser. Stays saved even if you close your device, but never uploaded to the internet.
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Convert Unix timestamps to ISO 8601, UTC, local time, and more. Supports seconds and milliseconds timestamps with real-time updates.
Transform your text into camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, and more. Support for bulk conversion and auto-detection.
Professional developer tool to encode, decode, and parse URLs. Edit query parameters and path segments dynamically, generate code snippets, and scan for security issues.
Convert client-side terminal cURL commands into clean JavaScript Fetch or Axios requests instantly.
Generate secure cron expressions visually using intuitive dropdown selectors or parse and translate cron strings into plain human-readable language instantly.
Securely decode and analyze your SSL/TLS certificates (.crt, .pem) entirely offline in your browser.
Write Markdown with side-by-side GitHub-styled preview, or convert HTML to Markdown instantly.
Create gorgeous multi-layered CSS box shadows, text shadows, linear/radial gradients, and glassmorphism presets completely offline.