JWT Decoder
Decode JWT tokens to view header, payload, and expiration.
About JWT Decoder
Decode JSON Web Tokens (JWT) instantly with our free JWT Decoder. View the header, payload, and expiration time without sending your token to any server.
Perfect for debugging authentication flows, inspecting OAuth tokens, and verifying token claims during development. See exactly what's inside a JWT before it expires.
Important: This tool decodes tokens only — it does NOT verify signatures. Never use decoded data from untrusted tokens for authorization decisions in production.
Key Features
- Decode JWT header and payload
- Display token expiration with valid/expired status
- Syntax-highlighted JSON output
- Copy header or payload separately
- 100% client-side decoding
How to Use
- 1Paste your JWT token (eyJ... format) into the input.
- 2Header and payload decode automatically.
- 3Check expiration status and claims.
- 4Copy decoded JSON as needed.
Common Use Cases
Frequently Asked Questions
Is it safe to paste JWT tokens here?+
Tokens are processed only in your browser and never sent to a server. However, avoid pasting production tokens with sensitive data on shared computers.
Does this verify JWT signatures?+
No. This decoder only reads the header and payload. Signature verification requires the secret key and must be done server-side.
What JWT algorithms are supported?+
All standard JWT formats (HS256, RS256, etc.) can be decoded. The algorithm is shown in the header section.
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