JWT Decoder
Decode and inspect JWT tokens. The signature is not verified — for inspection only.
⚠ Token expired at
✓ Valid until
Header
Payload
Signature (encoded)
About the JWT Decoder
JSON Web Tokens (JWTs) are a compact, URL-safe format for representing claims between two parties. They consist of three Base64URL-encoded parts — header, payload, and signature — separated by dots. This decoder splits and decodes all three parts so you can inspect the token's contents without any server-side code.
Useful for debugging authentication flows, inspecting token expiry times, checking issued-at and subject claims, and verifying that your token-generation code is producing the correct payload. Note: this tool decodes only — it does not verify the signature, so always validate tokens server-side before trusting their contents.