JWT Decoder
JWT Decoder splits a JSON Web Token into its header and payload and decodes them to readable JSON, so you can inspect claims like expiry and issuer.
Última actualización: July 2026
A JWT (JSON Web Token, defined in RFC 7519) is a compact, URL-safe token made of three Base64url-encoded parts separated by dots: header, payload and signature. This decoder splits the token and shows the readable header and payload JSON — including standard claims like exp, iat and iss — entirely in your browser. It does not verify the signature, which requires the signing key.
🔒 Decoded locally — your token never leaves your browser. Signature is not verified.
Cómo usar JWT Decoder
- Paste your JWT.
- Read the decoded header and payload.
- Inspect the claims.
Preguntas frecuentes
Does it verify the signature?
No — decoding only reads the header and payload. Signature verification needs the secret/key and is intentionally not done here.
Is my token uploaded?
Never. Decoding is purely local in your browser, so it's safe for sensitive tokens.
What does it show?
The decoded header and payload JSON, including standard claims like exp, iat and iss.
herramientas para desarrolladores relacionadas
UUID Generator
Generate random v4 UUIDs (GUIDs) in bulk and copy them with one click. Free, instant and fully in-browser using the secure crypto API.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text instantly. Free, private, in-browser — supports full Unicode (UTF-8).
JSON Formatter & Validator
Format, beautify, minify and validate JSON instantly. Free, private, in-browser JSON formatter with clear error messages.
Generador de códigos QR
Crea un código QR para una URL, texto o wifi gratis y en tu navegador. Descárgalo en alta resolución: sin subir nada, sin marca de agua.