Does this tool verify the JWT signature?

This tool decodes the payload for debugging. It does not verify the signature against a secret.

Is it safe to paste a production token here?

Yes. Decoding is local so your token is not sent over the network.

Does it format the payload automatically?

Yes. The decoded JSON is indented for easy reading.

Does it show when the token expires?

Yes. If the payload contains an exp claim, the tool shows "Expires in X min" or "Expired X min ago" so you can see token validity at a glance.

JWTデコーダー

The JWT Decoder lets you paste a JWT and view its decoded header and payload—user IDs, expiration, and other claims. Decoding is done in your browser so session tokens are not sent to our servers for this tool.

無料 · 制限なし · ブラウザで処理

使い方

1Paste your encoded JWT into the input area.
2View the decoded Header and Payload in the JSON panels.
3Check expiration and claims as needed.

よくある質問

Does this tool verify the JWT signature?: This tool decodes the payload for debugging. It does not verify the signature against a secret.
Is it safe to paste a production token here?: Yes. Decoding is local so your token is not sent over the network.
Does it format the payload automatically?: Yes. The decoded JSON is indented for easy reading.
Does it show when the token expires?: Yes. If the payload contains an exp claim, the tool shows "Expires in X min" or "Expired X min ago" so you can see token validity at a glance.