JWT Lens is made and published by Masaya Kontani. AppBrain is an independent app data site and isn't affiliated with Masaya Kontani. The app name, icon, screenshots and description belong to Masaya Kontani and are shown as published on the App Store.
AppBrain's verdict
- Last updated
- June 3, 2026
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Releases
Updates seen on the App Store- Version
- 1.0
- Launched
- June 2026
No changelog data
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Technology
Found in the app by AppBrain- Price
- Free
- App size
- 699.0 KB
- Content rating
- Everyone
Technologies used by JWT Lens
About the app and developer
About JWT Lens
JWT Lens is an overall app developed by Masaya Kontani.
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App Information
JWT Lens is freely available from the App Store. The app size is 699.00 kB. The latest version available is 1.0. The last update was on June 3, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since June 2026.
Developer information for Masaya Kontani
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Store listing
By Masaya Kontani, from the App Store
Description by Masaya Kontani Written by the developer, not by AppBrain. Click to read.
Tap the toolbar icon, paste a token (or grab the text you've selected on the page), and instantly see:
• Pretty-printed, color-coded Header and Payload
• Human-readable timestamps — exp, iat and nbf shown in your local time with relative phrasing ("expires in 59 minutes")
• An at-a-glance expiry badge: valid, expired, or not yet valid
• Plain-English descriptions of standard claims (iss, sub, aud, and more)
Need to check a signature? JWT Lens verifies HS256/384/512, RS256/384/512, PS256/384/512 and ES256/384/512 using a secret or PEM public key you provide — all computed locally with the system's WebCrypto, never sent anywhere.
Privacy by design:
• No network requests — ever
• No analytics, no tracking, no accounts
• Nothing is stored: tokens and keys live only in the popup while you use it
Whether you're debugging OAuth / OIDC flows, inspecting a bearer token, or learning how JWTs work, JWT Lens keeps it quick, clear, and completely on-device.
Universal app: works in Safari on macOS, iOS and iPadOS.