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Free JWT Decoder & Inspector Online — Hitechies

Free JWT Decoder & Inspector Online — Hitechies Security Tools
Hitechies / Tools / JWT Decoder
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Paste your JWT tokeneyJhbGciOi… format
Token structure
Header Payload Signature
Header
Payload
Token Info
What is a JWT Decoder?

A JWT decoder reads a JSON Web Token and displays its three parts in human-readable form. JWTs are Base64URL-encoded — the header and payload can be decoded without any secret key. This tool processes your token entirely in your browser using JavaScript, making it safe to inspect tokens containing user data, session information, and API claims.

Developers use JWT decoders when debugging authentication flows, inspecting claims from identity providers, checking token expiry without a server request, and understanding what data an OAuth provider is returning.

Frequently asked questions
What is a JWT?+
A JSON Web Token is a compact, URL-safe string used to represent claims between parties. It has three Base64URL-encoded parts: a header specifying the algorithm, a payload containing claims, and a signature for verification.
Is it safe to paste JWTs here?+
Yes. JWT decoding only Base64URL-decodes the header and payload — no server communication needed. Your token is processed entirely in your browser and never transmitted.
Can this tool verify a JWT signature?+
This tool decodes the JWT to show its contents. It does not verify the signature against your secret key — that requires your server-side JWT library.
What does token expiry mean?+
The exp claim is a Unix timestamp indicating when the token expires. This tool shows the expiry as a readable date and indicates whether the token is currently valid or expired.
What is the difference between HS256 and RS256?+
HS256 uses a shared secret key — both issuer and verifier use the same secret. RS256 uses a public/private key pair — preferred for distributed systems where multiple services verify tokens.
Privacy & security
Tokens never transmitted to any server
100% client-side processing
Works completely offline
No account or signup needed
Safe for production tokens
JWT structure
Header — algorithm & token type
Payload — claims & user data
Signature — verification hash
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JSON Formatter Base64 Decoder Hash Generator Password Generator All tools →
JWT Decoder · Hitechies Tools · Tokens never transmitted
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