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JSON Formatter & Validator - Beautify, validate & minify JSON locally. Zero uploads.

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Format, validate, and minify JSON instantly β€” entirely in your browser. Sort keys alphabetically, pinpoint syntax errors with line/column coordinates, and handle files up to 5MB. Zero uploads. Zero cookies. Zero tracking. Perfect for API responses, configs, and sensitive payloads.

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Maker
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Hey Product Hunt! πŸ‘‹ I'm excited to share JSON Formatter & Validator. a tool I built because every developer deserves a JSON formatter they can actually trust. The problem: Every time I needed to format or validate a JSON payload - API responses, config files, or sensitive data. I had to paste it into some random online tool. But I never knew where my data was going. Was it being logged? Stored? Sold? And the ones that claimed to be "secure"? They still uploaded my data to their servers. The solution: A JSON formatter that runs 100% in your browser - with developer-grade features: 🎨 Format / Beautify β€” Instantly structure messy JSON with 2-space, 4-space, or 1-tab indentation. πŸ” Validate with Precision β€” Pinpoints syntax errors with exact line numbers and column coordinates. Click the error, and it jumps your cursor right to the mistake. πŸ“¦ Minify / Compact β€” Condense JSON into a single inline string for production use. πŸ”€ Alphabetical Key Sorting β€” Recursively sort object keys A-Z while preserving data types and array indices. Perfect for consistent, readable configs. ⚑ Large File Support β€” Handles JSON files up to 5MB. For files above 100KB, syntax highlighting automatically switches off to keep interactions instant and lag-free. πŸ“‹ One-Click Copy β€” Copy clean, syntax-highlighted code directly to your clipboard. πŸ›‘οΈ Zero Trust Architecture β€” No uploads. No cookies. No tracking. No remote network transmission. Your API keys, secrets, and payloads stay on your device. Who is this for? Developers debugging API responses Engineers working with config files (package.json, tsconfig.json, etc.) Anyone handling sensitive JSON data who values privacy The key insight: Most online JSON tools upload your data to servers. We don't. We literally can't access your data because it never leaves your browser. That's the difference between a privacy policy and privacy by architecture. I'd love your feedback! Try it out and let me know what you think.
πŸ’Ž Pixel perfection

Loved that everything runs right in the browser with no upload step. Merged a few PDFs and it was genuinely instant.

love that everything runs locally, feels way safer than the usual sketchy upload sites. one thing i'd love to see is a batch queue feature where you can drop a bunch of files and let it process them all in sequence without having to redo the steps each time. would make handling bigger jobs way less repetitive

Maker

Β Thank you for the love! Keeping your files 100% safe and local is our main mission.A batch queue feature is a brilliant idea to cut down on repetitive tasks for bigger jobs. We have officially added this sequential batch processing to our immediate roadmap and are already brainstorming the best way to implement it in-browser.

Love that everything stays on device. One thing that would make this even better is a batch queue with a progress bar for video conversions, since larger files take a while and right now there's no clear indication of how long is left.

Maker

Β a batch queue along with a visual progress bar for video conversions is definitely coming! We know how important it is to see the exact progress for larger files, and we are already mapping out this feature to keep the UI clean yet informative.

Converted a few PDFs and an mp4 without any sign-up hassle, and everything stayed on my laptop the whole time. The compression was noticeably quick and the files looked clean afterward.

Maker

Β Thank you for the fantastic feedback!Thrilled to hear both the PDF and MP4 tools worked perfectly for you! Appreciate your support. stay tuned for more updates!