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90 lines
2.9 KiB
Markdown
90 lines
2.9 KiB
Markdown
## **jwt-decode** is a small browser library that helps decoding JWTs token which are Base64Url encoded.
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**IMPORTANT:** This library doesn't validate the token, any well formed JWT can be decoded. You should validate the token in your server-side logic by using something like [express-jwt](https://github.com/auth0/express-jwt), [koa-jwt](https://github.com/stiang/koa-jwt), [Owin Bearer JWT](https://github.com/michaelnoonan/Auth0-Owin-JwtBearerAuthentication), etc.
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---
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**Warning: When upgrading from version `2` to `3`, there's a potentially breaking change**
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If you've previously imported the library as `import * as jwt_decode from 'jwt-decode'`, you'll have to change your import to `import jwt_decode from 'jwt-decode';`.
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---
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## Installation
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[](https://app.fossa.com/projects/git%2Bgithub.com%2Fauth0%2Fjwt-decode?ref=badge_shield)
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Install with NPM or Yarn.
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Run `npm install jwt-decode` or `yarn add jwt-decode` to install the library.
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## Usage
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```javascript
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import jwt_decode from "jwt-decode";
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var token = "eyJ0eXAiO.../// jwt token";
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var decoded = jwt_decode(token);
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console.log(decoded);
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/* prints:
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* { foo: "bar",
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* exp: 1393286893,
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* iat: 1393268893 }
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*/
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// decode header by passing in options (useful for when you need `kid` to verify a JWT):
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var decodedHeader = jwt_decode(token, { header: true });
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console.log(decodedHeader);
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/* prints:
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* { typ: "JWT",
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* alg: "HS256" }
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*/
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```
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**Note:** A falsy or malformed token will throw an `InvalidTokenError` error.
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## Use as a CommonJS package
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```javascript
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const jwt_decode = require('jwt-decode');
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...
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```
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## Include with a script tag
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Copy the file `jwt-decode.js` from the `build/` folder to your project somewhere, then include like so:
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```html
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<script src="jwt-decode.js"></script>
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```
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## Older versions
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If you want to use the library trough Bower, an HTML import, use [version `v2.2.0`](https://github.com/auth0/jwt-decode/tree/v2.2.0). It has the same functionality.
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## Develop
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Run `npm run dev`, this will fire up a browser and watch the `/lib` folder.
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## Issue Reporting
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If you have found a bug or if you have a feature request, please report them at this repository issues section. Please do not report security vulnerabilities on the public GitHub issue tracker. The [Responsible Disclosure Program](https://auth0.com/whitehat) details the procedure for disclosing security issues.
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## Author
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[Auth0](https://auth0.com)
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## License
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This project is licensed under the MIT license. See the [LICENSE](LICENSE) file for more info.
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[browserify]: http://browserify.org
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[webpack]: http://webpack.github.io/
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[](https://app.fossa.com/projects/git%2Bgithub.com%2Fauth0%2Fjwt-decode?ref=badge_large)
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=======
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