编码与加密
JWT 解码器
免费的 JWT 解码器。解码 JSON Web 令牌以检查其头部和有效载荷。令牌绝不离开您的浏览器。适用于 OAuth、身份验证调试、API 集成。
Runs in your browser
编辑注
Understanding · Three Base64 sections, joined by dots.
本深度章节目前仅有英文版本。上方的转换工具支持您的语言;长篇说明文章尚未翻译。
常见问题
Quick answers.
›Does this verify the JWT signature?
No — the decoder shows header and payload only. Signature verification requires the issuer's secret or public key, which we never receive.
›Is my token sent to your servers?
Never. Decoding runs entirely in your browser — tokens stay on your device.
›What algorithms are supported?
Any JWT can be decoded (HS256, RS256, ES256, etc.) — decoding is algorithm-agnostic. Verification is the algorithm-specific step.
›What does each part of a JWT contain?
Header: algorithm and token type. Payload: claims (sub, iat, exp, custom data). Signature: HMAC or signature over header.payload using a secret/key.
›Is the decoder free?
Yes — fully free, no signup.
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