If you checkout the package.json file when installing the lib, you'll notice both builds in there. Verification of the JWT is done in the browser only Verified xxxxxxxxxx. This can be helpful when troubleshooting authentication failures when all you have is a trace. Warning: Security Tokens should be kept secret. eyJzdWIiOiJqYW5lZG9lQGV4YW1wbGUuY29tIiwibmFtZSI6I kphbmUgRG9lIiwiaWF0IjoxNTQ2MzAwODAwLCJleHAiOjE4OTM 0NTYwMDB9. 1 the jwt,io site decodes it, but there is no signature so it is invalid. Use the JWT Decoder tool to decode an encoded JWT Token and see the contents in clear text. You can grab the uid of the user or device from the decoded token. If the provided ID token has the correct format, is not expired, and is properly signed, the method returns the decoded ID token. The Firebase Admin SDK has a built-in method for verifying and decoding ID tokens. Other eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9. Verify ID tokens using the Firebase Admin SDK. We still have a CommonJS build, but by default most modern build systems for the web (not node) will use the ESM build. Demo: JWT Token Paste a JWT and decode its header, payload and signature. This is a breaking change, that's why I've created a new major version 3. Version 3 (now in beta) of this library includes a more modern ESM build, which is what JS import statements are meant for, so importing the modern ESM package can be done the regular way using import jwt_decode from 'jwt-decode'. Modern frameworks like Angular 10 throw a warning when using packages with the CommonJS format, because they generally speaking can't be tree-shaked. Third-party applications are intended to understand ID tokens. Information in ID tokens enables the client to verify that a user is who they claim to be. They can be sent alongside or instead of an access token. The way to import CommonJS libraries with a JS import statement is import * as library-name from 'library-name. Next steps The authorization server issues ID tokens that contain claims that carry information about the user. Jwt_decode has always been a CommonJS module which generally are imported as const jwt_decode = require('jwt-decode'), it's what Node.js uses.
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