Encoders & DecodersJWT Decoder

JWT Decoder

Decode and inspect JSON Web Tokens (JWT) without a secret key. View the header algorithm, payload claims (iss, sub, exp, iat), and signature. Check token expiration and identify standard claims at a glance.

JWT Token

JWT Decoder guide

Paste a JSON Web Token to inspect its decoded header and payload without needing a secret key. Toolfy's JWT Decoder is useful for debugging authentication flows, checking standard claims, and understanding token expiration during development.

Key features

Decode JWT header and payload sections
Inspect common claims such as iss, sub, exp, iat, aud, and scope
Check token expiration details at a glance
View the signature section without verifying or uploading the token

Common use cases

Debug OAuth, OpenID Connect, and API authentication tokens
Check whether a copied JWT is expired
Inspect token claims while troubleshooting authorization issues

Frequently asked questions

Can this verify a JWT signature?

This tool is for decoding and inspection. It shows the signature section but does not validate it with a secret or public key.

Is a secret required to decode a JWT?

No. JWT headers and payloads are Base64URL encoded and can be decoded without a secret.

Should I paste production tokens?

The decoder runs locally in your browser, but production tokens can still be sensitive and should be handled carefully.

Base64 Encode / Decode

Encode plain text or binary data to Base64 and decode Base64 strings back to readable text. Supports both standard and URL-safe Base64 alphabets. Useful for embedding data in JSON, HTML, CSS, or HTTP headers.

URL Encode / Decode

Encode and decode URL percent-encoded strings online. Supports both encodeURIComponent (encodes all special characters) and encodeURI (preserves URL structure characters like /, ?, #, &). Bidirectional — paste encoded or decoded text to convert instantly.

JSON Formatter

Instantly format, beautify, validate, and minify JSON data with syntax highlighting and error detection. Supports pretty-printing with configurable indentation and one-click minification for production use.

Random Token Generator

Generate cryptographically secure random tokens using the Web Crypto API. Choose token length and output format (hex, base64, alphanumeric). Suitable for API keys, session tokens, CSRF tokens, and secret values.