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Construct unsigned JWT fixtures with custom claims and expiry. Everything stays in your browser.
Unsigned means untrusted. This tool creates a local development fixture with an empty signature. Never use this token for authentication, authorization, or production traffic.
`iat` is added automatically. Set expiry to 0 to omit `exp`.
eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJzdWIiOiJ1c2VyLTEyMyIsInJvbGUiOiJ2aWV3ZXIiLCJpYXQiOjE3MzU2ODk2MDAsImV4cCI6MTczNTY5MzIwMH0.
Header · `alg: none`, no cryptographic signature
Payload · your claims plus issued-at and optional expiry
Signature · intentionally empty
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