Paste a JWT and instantly decode the header, payload, and signature with local browser-only processing.
Decoding runs fully in your browser. No server calls.
This jwt decoder online lets you decode jwt tokens instantly in your browser. Use it as a fast json web token decoder to inspect token header, payload claims, signature bytes, and expiration status without sending data to a server.
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Why developers still paste JWTs into random online tools →Most developers paste JWTs into random online tools without thinking twice. Here is what those tokens actually contain and why the tool you use matters more than you would think.
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Yes. This jwt decoder works entirely in your browser. Your token is decoded locally and never sent to any server.
No. This tool is a json web token decoder for inspection only. It decodes header, payload, and signature representation, but it does not validate a signing key.
The tool checks the exp claim in the payload. If exp is in the past, status is expired. If exp is in the future, status is valid. If no exp exists, it shows no exp claim.
A valid JWT must contain exactly three dot-separated sections. Header and payload must decode from Base64URL into valid JSON.