JWT Decoder & Parser
Decode JSON Web Tokens (JWT) to view encoded Header, Payload, and Expiration claims in real-time.
Free Online JWT Decoder & Inspector
ToolVixo’s JWT Decoder allows developers and software engineers to decode, inspect, and verify JSON Web Token contents instantly. JWTs are compact, URL-safe tokens commonly used for identity authentication in web frameworks, microservices, mobile apps, and OAuth 2.0 implementations.
Key Features
- Real-time Decoding: Decodes Header and Payload instantly as you paste or type a JWT string.
- Token Status Verification: Automatically checks claims like
exp(expiration) andiat(issued at) to show if the token is active or expired. - 100% Secure & Private: Decoding is executed completely on the client-side inside your browser memory. Your authentication tokens are never sent to any server.
- Clean JSON Formatting: Automatically formats raw JSON payloads into human-readable formatted structures.
What is inside a JSON Web Token?
A standard JWT consists of three parts separated by dots (.):
- Header: Contains metadata about the token type and cryptographic signature algorithm used (e.g., HS256, RS256).
- Payload: Contains claims (user IDs, roles, issued time, expiration time, and custom attributes).
- Signature: Cryptographic verification string generated using a secret key or private key pair.
Frequently Asked Questions
Is it safe to paste sensitive tokens here?
Yes! ToolVixo performs all Base64Url decoding entirely locally using modern JavaScript execution. No network requests are made, keeping your access tokens completely private.
Does this tool verify token signatures?
This tool focuses on decoding and inspecting token claims. Validating the signature requires access to your private key or secret key, which should never be shared online.