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Beautify, minify, repair and transform JSON instantly. 100% local — your data never leaves the browser. From echtcosplay.de. Tired of pasting messy JSON into sketchy online formatters and hoping your API keys, configs, and client data aren't being logged somewhere? JSON Formatter by EchtCosplay does the job instantly — and your data never leaves your browser. WHAT IT DOES • Beautify — turn minified, unreadable JSON into clean, indented output • Minify — strip whitespace for production payloads and storage • Repair — fix common JSON errors automatically: missing quotes, single quotes, trailing commas, unclosed brackets, comments, JSONP wrappers • Sort Keys — recursively alphabetize every key • Clean Empty / Strip Null — remove empty strings, empty objects, empty arrays and null values • Escape / Unescape — convert JSON to a safely embeddable string and back • Load JSON from any URL with one click • Download, copy, or clear with a single tap • Live stats: line count, file size, key count, nesting depth WORKS THE WAY YOU WORK • Toolbar popup — quick beautify/minify for small snippets, without leaving what you're doing • Full-page editor — a spacious two-pane side-by-side view for bigger jobs • Browser side panel — keep a formatter open next to the page you're debugging • Right-click any selected text on a web page → "Send to JSON Formatter" and it's loaded automatically FAST ON HUGE FILES Processing runs in a dedicated Web Worker, so the interface stays responsive even with multi-megabyte payloads. Large nested objects, deep arrays, and heavy API responses are no problem. ZERO DATA LEAKS — BY DESIGN Everything runs 100% locally inside your browser. There is no backend, no upload, no account, no analytics on your content. Your configuration files, API responses, and sensitive data stay exactly where they belong: on your device. It's the privacy-preserving alternative to every online JSON formatter. FREE & OPEN FRONT-END Built by EchtCosplay (echtcosplay.de) — a collection of fast, free, browser-based developer tools. Install JSON Formatter and stop trusting random websites with your data.