JWT Analyzer & Crafter
Deeply dissect JSON Web Tokens. Decode payload data, analyze human-readable expiration times, and instantly craft or re-sign completely new mock tokens for testing.
Header
Verify & Re-Sign Signature
HS256 ONLYPayload Data
Craft New Token
Modified the header or payload above? You can instantly generate and copy the updated token string. If you entered a Secret, the signature is safely recalculated.
Guide & Insights
The Ultimate JWT Diagnostics Lab
Stop manually converting timestamps or fighting command-line tools to forge test tokens. Our JWT Analyzer & Crafter deeply dissects your JSON Web Tokens directly in the browser, translating technical payloads into human-readable insights, and allowing you to instantly craft entirely new valid tokens on the fly.
Deep Dissection
Paste any JWT to instantly split the raw string into visually color-coded segments, revealing the underlying JSON of the Header and Payload fields cleanly and format-perfect.
Humanized Times
We automatically detect exp (expiration) and iat (issued at) Unix timestamps and instantly translate them: no math needed. Know precisely if a token expired "2 hours ago" or expires "in 30 mins".
Crafter & Signer
Need to mock an admin session? Edit the JSON payload right in the browser, provide a secret key, and the tool leverages native Web Crypto to instantly generate a legally-signed mock token for your local testing.
Related Tools
URL Payload Analyzer
Deconstruct complex, messy, and deeply encoded URLs. Read and edit parameters safely, auto-decode deeply nested layers (Base64, Double UrlEncode).
Go Struct โ JSON Converter
Instantly generate production-ready Go struct definitions from any JSON payload, complete with typed fields and custom JSON tags. Bi-directional parsing allows you to perfectly render JSON responses directly from nested Golang structs.
WiFi QR Code Generator
Create a professional, printable QR code card for your guests. All data is processed locally in your browser for maximum security.
TypeScript โ JSON Converter
Convert JSON to TypeScript interfaces or vice-versa. Support nested structures, optional fields, and JSDoc generation. Perfect for frontend developers building type-safe applications.