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SparkJSON
Fast, 100% client-side developer utility & JSON tool suite
Pretty-print, validate, beautify, and debug JSON instantly in your browser. Free online JSON formatter with client-side processing and zero server uploads.
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 Cluttered, Slow UIs: Outdated interfaces filled with heavy ads that freeze or crash when you paste large JSON payloads.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! 🚀
One thing that would make this even better is a built-in diff view so I can compare two JSON blobs side by side and spot exactly where they differ. Right now I have to paste into a separate tool for that, which breaks the flow when I'm debugging API responses.
SparkJSON was submitted on Product Hunt and earned 0 upvotes and 2 comments, placing #33 on the daily leaderboard. Pretty-print, validate, beautify, and debug JSON instantly in your browser. Free online JSON formatter with client-side processing and zero server uploads.
SparkJSON was featured in Productivity (658.2k followers), Developer Tools (517.5k followers) and Development (6.1k followers) on Product Hunt. Together, these topics include over 235.3k products, making this a competitive space to launch in.
Who hunted SparkJSON?
SparkJSON was hunted by Nadula Sankalana. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Nadula Sankalana