NetOpsKit

JWT Decoder

Decode a JSON Web Token's header, payload and timestamp claims locally in your browser.

Decode a JWT

Processed locally in your browser. Your token is not uploaded.

Important: Decoding a JWT does not verify its signature or prove that the token is authentic.

What JWT decoding shows

A JWT commonly contains a Base64URL-encoded JSON header and payload followed by a signature segment. Claims such as issuer, audience, subject and expiration become readable after decoding.

Decoding is not verification

Anyone can construct or alter encoded data. Authentication requires cryptographic signature verification against a trusted key plus checks for issuer, audience, algorithm and applicable time claims.

Frequently asked questions

Does decoding verify a JWT signature?

No. Decoding only reveals the token's encoded parts and does not prove who created it or whether it was modified.

What are exp, iat and nbf?

They are NumericDate claims for expiration, issued-at time and the earliest time the token should be accepted.

Is the token uploaded?

No. The token is decoded locally in your browser and is not sent to NetOpsKit.

JSONJSON Formatter & ValidatorFormat, minify, and validate JSON entirely in your browser.B64Base64 Encoder & DecoderEncode and decode UTF-8 text using Base64 or Base64URL locally.TIMEUnix Timestamp ConverterConvert Unix seconds or milliseconds to UTC, local time, and ISO 8601, or convert back.