JWT Decoder Online
Inspect your JSON Web Tokens. Decode the header and payload instantly to debug authentication and view data claims.
Security Notice
While this tool runs 100% in your browser and never sends your data to a server, we recommend never pasting sensitive production tokens into any online tool.
Awaiting Token
Paste a JWT on the left to see the decoded header and payload.
Debug Your Authentication Tokens
JSON Web Tokens (JWT) are the standard for modern web security. Our JWT Decoder allows you to quickly view the 'claims' embedded in your tokens, such as user IDs, permissions, and expiration dates.
By decoding the Base64Url encoded sections, you can ensure that your server is issuing the correct data and that your authentication flow is working as expected.
Readable Claims
View standard fields like exp (expiration), iat (issued at), and custom app data in a clean JSON format.
Header & Payload
Clearly separates the Header (algorithm info) from the Payload (data) for easier debugging.
Client-Side Only
We do not log your tokens. Decoding happens in JavaScript within your own browser instance.
More Developer & SEO Tools
JSON Formatter
Validate and prettify JSON data.
JWT Decoder
Decode and inspect JWT tokens.
URL Encoder/Decoder
Encode or decode URL strings.
Base64 Encoder
Convert text or files to Base64.
Hash Generator
Generate MD5, SHA-1, SHA-256 hashes.
UUID Generator
Generate random UUIDs (v4).
Regex Tester
Test regular expressions online.
UTM Builder
Create tracked campaign URLs.
SEO Title Checker
Preview titles in SERPs.
Meta Description
Check description length and pixels.
Open Graph Preview
Test social media link previews.
Robots.txt Gen
Create robots.txt files easily.
Sitemap Generator
Build XML sitemaps for SEO.
Canonical Checker
Verify canonical tags.