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JWT Decoder

JSON Web Token

JWT Decoder decodes JSON Web Tokens (JWT) client-side. The decoder splits raw token strings by dot separators, decodes base64url-encoded headers and payload segments, and renders formatted JSON trees with validation checks.

Open JWT Decoder

How It Works

1

Paste Token

Paste your encoded JWT string (header.payload.signature) into the text region.

2

Analyze JSON

The utility breaks down and pretty-prints the Header claims and Payload keys separately.

3

Check Claims

View claim analyses detailing token expiration times and active signature statuses.

Frequently Asked Questions

Does this tool verify token signatures?

This tool is a client-side decoder that displays header and payload structures. It does not perform cryptographic signature key validations on servers.

Is it safe to paste developer tokens here?

Yes. Hashing and decoding take place entirely inside your local browser memory, ensuring your API secret keys remain confidential.