This tool runs only in your browser. It does not upload your token anywhere.
Security note: decoding does NOT verify the signature. Do not trust the contents unless you verify it server-side.
JWT decoder — Decode a JWT locally to view header and payload JSON. Shows common claims and converts iat/nbf/exp to dates. Copy JSON or share a link. No signature verification. Browser-only MVP.
Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.
FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.
JWT 解碼器 — 在本機解碼 JWT，查看 header 與 payload JSON；顯示常見 claims，並把 iat/nbf/exp 轉成日期。可複製 JSON 或分享連結。不做簽章驗證。純前端 MVP。
範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。
FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。