What are the benefits of JWT Decoder?

[Claim Inspection] When working with production tokens, paste only the JWT portions needed to inspect their contents.. [Real-Time Analysis] Header, payload, and signature information appear instantly as you paste, with live countdown showing time until expiration.. [Developer-Friendly] Displays algorithm details for HS256, RS256, ES256, and more, with highlighted standard claims (iss, sub, aud, exp, iat, nbf, jti) to streamline your debugging workflow..

Yes, it is completely free to use, and no registration is required. Tool processing happens entirely in your browser, and your input content and uploaded files are not sent to a server. Our first-party improvement metrics use no cookies, visitor IDs, or session IDs and store only normalized page paths and daily counts for fixed event IDs.

JWT Decoder

Paste a JWT token to instantly decode its header, payload, and signature. Check expiration status and inspect standard claims with a single click.

開発者ツール

JWTデコーダー

JWTトークンを貼り付けて、内容をデコード・検査します。

JWTトークン

JWTに含まれる機密情報に注意し、必要な部分だけを入力してください。

About JWT Decoder

JWT Decoder is a browser-based tool for visually inspecting the structure of JSON Web Tokens (RFC 7519). A JWT consists of three Base64URL-encoded parts: header, payload, and signature. This tool separates and decodes each part, displaying them in readable JSON format for easy analysis.

Automatically displays detailed information for major signing algorithms (HS256, RS256, ES256, PS256) and calculates remaining time until expiration in real-time. Supports highlighting of standard claims including issued-at (iat), not-before (nbf), issuer (iss), subject (sub), and audience (aud). Multiple audiences are displayed as easy-to-read tags, and custom claims are fully visible in JSON format.

JWTs can contain personal data, permission scopes, and operational details, so paste only the parts needed when working with production tokens. The tool automatically detects JWE (encrypted) tokens and helps distinguish between JWT and JWE types. It is useful for troubleshooting authentication flows, debugging OAuth2/OpenID Connect implementations, and validating tokens during API testing.

How to use JWT Decoder

Paste the JWT token (a string starting with eyJhbGci...) into the text area at the top of the page.
The header (blue panel) and payload (purple panel) are instantly decoded and displayed in formatted JSON.
Check the signature panel (gray) for the signing algorithm and the expiration badge to see if the token has expired.
Use the 'Copy' button on each panel to copy the decoded JSON to your clipboard for use in other tools.

Benefits of JWT Decoder

[Claim Inspection] When working with production tokens, paste only the JWT portions needed to inspect their contents.
[Real-Time Analysis] Header, payload, and signature information appear instantly as you paste, with live countdown showing time until expiration.
[Developer-Friendly] Displays algorithm details for HS256, RS256, ES256, and more, with highlighted standard claims (iss, sub, aud, exp, iat, nbf, jti) to streamline your debugging workflow.