JWT Decoder Online
Decode and inspect JSON Web Tokens — view header, payload, and expiration.
Processed locally in your browserPaste a JWT token above to decode it instantly — all processing happens in your browser.
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How to Use
Decode and inspect JSON Web Tokens (JWT) instantly with this free online tool.
- Paste a JWT token into the input field.
- The decoded header, payload, and signature are displayed instantly.
- Standard claims like expiration (exp), issued at (iat), and issuer (iss) are shown with human-readable labels and dates.
- The tool shows whether the token is currently valid, expired, or not yet active.
- Click Copy next to any section to copy its JSON to your clipboard.
All decoding happens in your browser — your tokens are never sent to any server. However, avoid pasting production tokens with sensitive data into any online tool.
Features
- ✓Decode header and payload
- ✓Human-readable claim labels
- ✓Expiration status check
- ✓Color-coded token parts
- ✓One-click copy per section
- ✓No data leaves your browser
Frequently Asked Questions
- What is a JWT token?
- A JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a compact, URL-safe JSON object. A JWT consists of three parts separated by dots: a header (algorithm and type), a payload (claims/data), and a signature. JWTs are commonly used for authentication and authorization in web applications.
- Is it safe to decode a JWT online?
- Decoding a JWT only reveals the header and payload, which are not encrypted — they are merely base64url-encoded. This tool processes tokens entirely in your browser with no server communication. However, avoid pasting production tokens containing sensitive claims into any online tool as a security best practice.
- Can this tool verify JWT signatures?
- This tool decodes and displays the JWT contents but does not verify signatures, as that requires the signing key or public key. For signature verification, you need the corresponding secret (for HMAC) or public key (for RSA/ECDSA), which should never be shared with online tools.