skefo
All tools

JWT Decoder

Inspect JSON Web Token headers and claims (unverified).

Encoding

Decodes the header and payload locally. The signature is never verified — treat any claims as untrusted.

JWT Decoder is part of skefo, a collection of 58 developer and pentester utilities that run entirely in your browser. Inspect JSON Web Token headers and claims (unverified). No data is ever uploaded to a server.

More Encoding tools

Base64 Encode / Decode

Convert text to and from Base64 with full UTF-8 support.

URL Encode / Decode

Percent-encode and decode URL components.

Hex ↔ Text

Convert between UTF-8 text and hexadecimal bytes.

HTML Entity Encode / Decode

Escape and unescape HTML entities for safe output review.

Base32 Encode / Decode

RFC 4648 Base32 — used by TOTP secrets and tokens.

Base58 Encode / Decode

Bitcoin-style Base58 without ambiguous characters.

Query String ↔ JSON

Convert URL query strings to JSON and back.

String Escape

Escape or unescape backslash sequences like \n and \uXXXX.

CSV ↔ JSON

Convert CSV to a JSON array of objects and back.

Morse Code

Encode and decode International Morse code.