JWT Viewer

The JWT Viewer shows a token’s header and payload as nicely formatted JSON side by side, decoded locally. It is for developers who simply want to read a token’s two JSON sections clearly.

A JWT’s header and payload are Base64url-encoded and hard to read inline. Viewing them as formatted JSON side by side makes the structure obvious, with the token kept private.

1. Paste the JWT you want to view.
2. The header and payload are decoded and formatted as JSON.
3. Read the two sections side by side.
4. Copy whichever section you need.

• Side-by-side header and payload JSON
• Formatted, indented output
• Local decoding
• Nothing uploaded — JWT Viewer

• Quickly reading a token’s payload during development
• Comparing the header algorithm against the payload claims
• Copying a formatted claim set for a bug report
• Learning the two-part structure of a JWT

• Use this for reading; verify the signature server-side before trusting any claim.
• Keep tokens out of shared documents, since they grant access while valid.
• Check the header’s algorithm matches what your system expects.

• Believing the formatted view confirms the token is valid; it only decodes it.
• Pasting a token into shared notes, exposing a live credential.
• Confusing the header’s algorithm field with actual signature verification.