Is this safe to use with real tokens?

Yes. Everything runs in your browser. Your tokens are never sent to any server.

What signature algorithms are supported?

HS256 verification is supported by entering a secret key. RS256 tokens can be decoded but verification requires a public key.

What does the expiry check show?

If the token has an 'exp' claim, the tool shows whether it's valid or expired, and the exact time remaining or elapsed.

Is this tool helpful?

JWT Debugger

Decode, inspect, and verify JWT tokens

JWT Token

About JWT Debugger

What is JWT Debugger?

Paste a JWT to decode its header, payload, and signature with color-coded sections. Check token expiry, understand standard claims, and verify signatures for HS256 tokens.

Features & Benefits

Color-coded header, payload, and signature sections
Formatted JSON display of decoded content
Token expiry check with time remaining
Standard claims explained (iss, sub, exp, iat)
HS256 signature verification with secret key
Works entirely offline — tokens never sent anywhere

Frequently Asked Questions

Is this safe to use with real tokens?: Yes. Everything runs in your browser. Your tokens are never sent to any server.
What signature algorithms are supported?: HS256 verification is supported by entering a secret key. RS256 tokens can be decoded but verification requires a public key.
What does the expiry check show?: If the token has an 'exp' claim, the tool shows whether it's valid or expired, and the exact time remaining or elapsed.

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100% Private & Secure

This tool runs entirely in your browser. Your files and data never leave your device and are not uploaded to any server.