![]() If anyone can think of any low effort, high value changes to this code, feel free to edit my answer for the benefit of next(person). Then you can test at run-time for specific types of errors and avoid any naming collision. This error occurs if the JSON Web Token (JWT) specified in theIt works as a JWT debugger you can sign a JWT and verify JWT if you have signing key or public/private key. * T the expected shape of the parsed token Online JWT Encoder/Decoder is a free tool for encoding and decoding JWT (JSON Web Token). * Returns a JS object representation of a Javascript Web Token from its common encoded The header consists of the algorithm used to encode the signature, such as HS256 which means the token uses HMAC-SHA256 to generate the signature and the token. However, we could decode the JSON of the header and read the alg field to get this value. The JSDoc annotations will make future maintainers of your code thankful. SignatureAlgorithm sa SignatureAlgorithm.HS256 SecretKeySpec secretKeySpec new SecretKeySpec(secretKey.getBytes(), sa.getJcaName()) In this example, we've hard-coded our signature algorithm to HS256. Additionally JSON.parse can fail at runtime and this version (especially in Typescript) will force handling of that. If the web application is using a strong secret, it can take a very long time to crack. 6,640 6 22 26 1 the jwt,io site decodes it, but there is no signature so it is invalid. ![]() ![]() This answer is particularly good, not only because it does not depend on any npm module, but also because it does not depend an any node.js built-in module (like Buffer) that some other solutions here are using and of course would fail in the browser (unless polyfilled, but there's no reason to do that in the first place). Kokomelom 23 1 4 Add a comment 3 Answers Sorted by: 4 Hashcat allows you to crack multiple formats including the one you mentioned ( JWT HS256) and the strength of it relies on the secret. If you're using Typescript or vanilla JavaScript, here's a zero-dependency, ready to copy-paste in your project simple function (building on Maharjan 's answer).
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