Paste JSON, YAML, XML, SQL, CSV or code and get formatted, validated output instantly. 58 formats, 48 converters and JSON tools (diff, schema, repair, jq). Everything runs in your browser, enforced by a strict CSP, so nothing you paste leaves your machine.
Hi Product Hunt! I built PasteKit after reading that researchers found 80,000+ saved pastes, full of credentials and keys, on two popular formatter sites. PasteKit does everything in your browser: real formatters (Prettier, Ruff, gofmt, rustfmt…) compiled to WebAssembly, a lossless JSON parser that keeps big numbers exact, and errors explained in plain English. It works offline and is free with no sign-up. What format or tool should I add next?
About PasteKit on Product Hunt
“Format JSON, YAML & SQL privately”
PasteKit launched on Product Hunt on October 18th, 2026 and earned 88 upvotes and 1 comments, placing #13 on the daily leaderboard. Paste JSON, YAML, XML, SQL, CSV or code and get formatted, validated output instantly. 58 formats, 48 converters and JSON tools (diff, schema, repair, jq). Everything runs in your browser, enforced by a strict CSP, so nothing you paste leaves your machine.
On the analytics side, PasteKit competes within Productivity, Privacy and Developer Tools — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how PasteKit performed against the three products that launched closest to it on the same day.
Who hunted PasteKit?
PasteKit was hunted by Koh Yee Huei. 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.
For a complete overview of PasteKit including community comment highlights and product details, visit the product overview.
Koh Yee Huei