Auth & Token Tools
Inspect and build common authentication tokens locally in your browser. 25 tools are currently live in this section.
JWT Header Decoder
Decode the header segment of a JWT without sending it anywhere.
Open tool →JWT Payload Decoder
Decode the payload segment of a JWT locally.
Open tool →JWT Claims Summary
Summarize common JWT claims such as subject, audience, issuer, and timestamps.
Open tool →JWT Expiration Checker Pro
Read the exp claim and show whether a JWT is expired at a chosen time.
Open tool →JWT Issued-At Formatter
Convert a JWT iat Unix timestamp into an ISO date.
Open tool →JWT Audience Extractor
Extract the aud claim from a JWT payload.
Open tool →JWT Scope Extractor
Extract and normalize scope/scp claims from a JWT.
Open tool →JWT Algorithm Inspector
Read the alg and typ values from a JWT header.
Open tool →JWT Segment Splitter
Split a JWT into header, payload, and signature segments.
Open tool →JWT Structure Validator
Check JWT segment count and Base64URL/JSON structure without verifying a signature.
Open tool →Base64URL Encoder
Encode UTF-8 text with URL-safe Base64 without padding.
Open tool →Base64URL Decoder
Decode URL-safe Base64 text locally.
Open tool →Basic Auth Credential Decoder
Decode a Basic Authorization credential into username and password locally.
Open tool →Bearer Token Extractor
Extract the token portion from a Bearer Authorization value.
Open tool →Authorization Header Parser
Split an Authorization header into scheme and credentials.
Open tool →API Key Header Builder
Build a custom HTTP API-key header locally.
Open tool →API Key Query Builder
Add an API-key parameter to a URL without contacting the destination.
Open tool →PKCE Code Verifier Generator
Generate a cryptographically random RFC 7636-style verifier in your browser.
Open tool →PKCE S256 Challenge Generator
Generate the S256 code challenge for a PKCE verifier locally.
Open tool →OAuth State Generator
Generate a random URL-safe OAuth state value in the browser.
Open tool →OAuth Nonce Generator
Generate a random URL-safe OpenID Connect nonce locally.
Open tool →OAuth Scope Normalizer
Deduplicate and normalize a whitespace-separated OAuth scope list.
Open tool →OAuth Authorization URL Builder
Build an OAuth authorization URL from common parameters locally.
Open tool →OAuth Response Parameter Parser
Parse OAuth callback query or fragment parameters locally.
Open tool →Token Lifetime Calculator
Calculate token lifetime and remaining seconds from Unix timestamps.
Open tool →About Auth & Token Tools
Inspect and build common authentication tokens locally in your browser. MediaZuno groups closely related utilities together so you can move between tasks without hunting across different websites.