Hey Product Hunt! 👋 I'm Nadula, creator of SparkJSON. Like many developers, I use JSON formatters, JWT decoders, and data utility tools almost every single day. But I kept running into two major issues with existing web tools: 1. Privacy Concerns: Processing sensitive payloads, API tokens, or user data through unknown external backend servers. 2. Cluttered, Slow UIs: Outdated interfaces filled with heavy ads that freeze or crash when you paste large JSON payloads. I built SparkJSON to fix both problems. It’s an all-in-one suite of developer utilities designed with a zero-compromise approach: 🔒 100% Client-Side Privacy: Your JSON payloads, JWTs, and base64 strings never leave your browser. Zero server uploads. ⚡ Blazing Fast: Powered by Web Workers to handle multi-megabyte payloads smoothly without locking up your tab. 🛠️ Precise Debugging: Instant line & column error detection along with one-click auto-fixing for trailing commas and quote errors. 🧰 All-in-One Utility Suite: Includes JSON Formatter & Validator, JWT Decoder, Base64 Encoder/Decoder, and clean developer cheat sheets. I’d love to hear your feedback! What other developer tools or features would you like to see added next? Thanks for checking out SparkJSON! 🚀

SparkJSON

Fast, 100% client-side developer utility & JSON tool suite

Fast, 100% client-side developer utility & JSON tool suite