# Decoder Ring

> A browser-based developer toolkit for decoding, encoding, inspecting, and formatting tokens, timestamps, and data — everything runs locally in the browser and nothing is ever sent to a server.

Decoder Ring is a single-page application for developers working with authentication tokens, identity protocols, and structured data. All processing is client-side.

## Tools

- **JWT** (`/jwt/decode`, `/jwt/encode`) — Decode any JWT with syntax-highlighted header/payload/expiry display; encode and sign tokens with HS256/HS384/HS512 or produce unsigned None tokens with payload templates
- **SAML** (`/saml/decode`, `/saml/encode`) — Decode base64 SAML assertions into formatted XML and an attributes table; encode XML back to base64
- **OIDC Sandbox** (`/oidc`) — Run a full Authorization Code + PKCE flow in the browser; supports Discovery, token display, and RFC 7009 revocation
- **PKCE Generator** (`/oidc/pkce`) — Generate a random code verifier and S256 code challenge
- **Base Encoding** (`/base64`) — Encode and decode Base64, Base64url, Base32, Base16, Base58, and Base62
- **URL Encoder / Decoder** (`/web`) — Percent-encode and decode URL strings
- **HAR Parser** (`/web/har`) — Inspect HTTP Archive files with automatic redaction of credentials and sensitive headers
- **String Escaper** (`/web/escape`) — Escape and unescape common sequences (`\n`, `\t`, `\uXXXX`, `\xXX`, etc.)
- **Timestamp Decoder** (`/timestamp/decode`) — Convert Unix timestamps and ISO 8601 strings in both directions
- **Timezone Converter** (`/timestamp/timezone`) — Convert a date/time between ~18 common IANA timezones
- **JSON / XML Beautifier** (`/beautify/json`, `/beautify/xml`) — Format and minify JSON or XML; XML preserves comments, CDATA, and processing instructions

## Privacy

All processing happens in the browser. No tokens, files, or inputs are sent to any server. `localStorage` is used only to persist user preferences and encoder settings.

## Full reference

For detailed input/output descriptions, feature lists, and URL paths for every tool, see `/llms-full.txt`.