Decode and analyze JSON Web Tokens (JWT) securely
Copy your JWT token from your application or API response and paste it into the input field above.
The tool automatically decodes your JWT token and displays the header, payload, and signature in a readable format.
Review the decoded information including claims, expiration time, issuer, and other important token details.
The tool automatically checks if your token is expired and highlights the expiration status.
A JWT token consists of three parts separated by dots (.): Header.Payload.Signature
Contains metadata about the token, including the signing algorithm and token type.
Contains the claims and user data. This is where the actual information is stored.
Used to verify that the token hasn't been tampered with and was issued by a trusted source.
Our tool uses Base64 URL decoding to convert each part of the JWT token back to its original JSON format. The header and payload are decoded and displayed as readable JSON, while the signature is shown in its encoded form. All processing happens in your browser - no data is sent to our servers.
Our free online JWT (JSON Web Token) decoder is a powerful tool designed for developers, security professionals, and anyone working with authentication systems. JWT tokens are widely used in modern web applications for secure information transmission and user authentication. This tool provides instant decoding and analysis of JWT tokens without requiring any software installation or registration.
The JWT decoder supports all standard JWT algorithms including HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, and ES512. It automatically validates the token format, decodes the header and payload sections, and provides detailed information about token claims, expiration times, and other metadata. The tool also includes features like expiration checking, timestamp formatting, and comprehensive error handling to ensure accurate token analysis.
Security and privacy are our top priorities. All JWT decoding operations are performed entirely in your browser using client-side JavaScript. No token data is transmitted to our servers, ensuring that your sensitive information remains completely secure. The tool works offline once loaded, making it perfect for analyzing tokens in secure environments or when working with confidential data.