Developer Guide5 min read Updated August 24, 2026

Decoding & Inspecting JSON Web Tokens (JWT)

Pasting production OAuth JWT tokens into public websites is a major security risk. Learn how to decode JWT headers and payload claims 100% locally.

Quick Takeaway

Use our JWT Decoder to paste access tokens, inspect payload claims, view human-readable expiration dates (exp), and verify token scopes privately.

Understanding JWT Structure (Header.Payload.Signature)

JWTs consist of 3 Base64URL-encoded strings separated by dots: Header (algorithm & token type), Payload (user claims & exp), and Signature.

JWT Decoder

Decode and inspect JSON Web Tokens in your browser.

Hash Generator

Generate MD5, SHA-1 and SHA-256 hashes of text or files.

Base64 Encode & Decode

Encode text to Base64 or decode it back, with URL-safe support.

Is my JWT token sent to any external server?↓

No. The JWT parsing algorithm runs completely in local browser RAM.