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+# jwt-go
+
+[![build](https://github.com/golang-jwt/jwt/actions/workflows/build.yml/badge.svg)](https://github.com/golang-jwt/jwt/actions/workflows/build.yml)
+[![Go
+Reference](https://pkg.go.dev/badge/github.com/golang-jwt/jwt/v5.svg)](https://pkg.go.dev/github.com/golang-jwt/jwt/v5)
+[![Coverage Status](https://coveralls.io/repos/github/golang-jwt/jwt/badge.svg?branch=main)](https://coveralls.io/github/golang-jwt/jwt?branch=main)
+
+A [go](http://www.golang.org) (or 'golang' for search engine friendliness)
+implementation of [JSON Web
+Tokens](https://datatracker.ietf.org/doc/html/rfc7519).
+
+Starting with [v4.0.0](https://github.com/golang-jwt/jwt/releases/tag/v4.0.0)
+this project adds Go module support, but maintains backwards compatibility with
+older `v3.x.y` tags and upstream `github.com/dgrijalva/jwt-go`. See the
+[`MIGRATION_GUIDE.md`](./MIGRATION_GUIDE.md) for more information. Version
+v5.0.0 introduces major improvements to the validation of tokens, but is not
+entirely backwards compatible. 
+
+> After the original author of the library suggested migrating the maintenance
+> of `jwt-go`, a dedicated team of open source maintainers decided to clone the
+> existing library into this repository. See
+> [dgrijalva/jwt-go#462](https://github.com/dgrijalva/jwt-go/issues/462) for a
+> detailed discussion on this topic.
+
+
+**SECURITY NOTICE:** Some older versions of Go have a security issue in the
+crypto/elliptic. Recommendation is to upgrade to at least 1.15 See issue
+[dgrijalva/jwt-go#216](https://github.com/dgrijalva/jwt-go/issues/216) for more
+detail.
+
+**SECURITY NOTICE:** It's important that you [validate the `alg` presented is
+what you
+expect](https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/).
+This library attempts to make it easy to do the right thing by requiring key
+types match the expected alg, but you should take the extra step to verify it in
+your usage.  See the examples provided.
+
+### Supported Go versions
+
+Our support of Go versions is aligned with Go's [version release
+policy](https://golang.org/doc/devel/release#policy). So we will support a major
+version of Go until there are two newer major releases. We no longer support
+building jwt-go with unsupported Go versions, as these contain security
+vulnerabilities which will not be fixed.
+
+## What the heck is a JWT?
+
+JWT.io has [a great introduction](https://jwt.io/introduction) to JSON Web
+Tokens.
+
+In short, it's a signed JSON object that does something useful (for example,
+authentication).  It's commonly used for `Bearer` tokens in Oauth 2.  A token is
+made of three parts, separated by `.`'s.  The first two parts are JSON objects,
+that have been [base64url](https://datatracker.ietf.org/doc/html/rfc4648)
+encoded.  The last part is the signature, encoded the same way.
+
+The first part is called the header.  It contains the necessary information for
+verifying the last part, the signature.  For example, which encryption method
+was used for signing and what key was used.
+
+The part in the middle is the interesting bit.  It's called the Claims and
+contains the actual stuff you care about.  Refer to [RFC
+7519](https://datatracker.ietf.org/doc/html/rfc7519) for information about
+reserved keys and the proper way to add your own.
+
+## What's in the box?
+
+This library supports the parsing and verification as well as the generation and
+signing of JWTs.  Current supported signing algorithms are HMAC SHA, RSA,
+RSA-PSS, and ECDSA, though hooks are present for adding your own.
+
+## Installation Guidelines
+
+1. To install the jwt package, you first need to have
+   [Go](https://go.dev/doc/install) installed, then you can use the command
+   below to add `jwt-go` as a dependency in your Go program.
+
+```sh
+go get -u github.com/golang-jwt/jwt/v5
+```
+
+2. Import it in your code:
+
+```go
+import "github.com/golang-jwt/jwt/v5"
+```
+
+## Usage
+
+A detailed usage guide, including how to sign and verify tokens can be found on
+our [documentation website](https://golang-jwt.github.io/jwt/usage/create/).
+
+## Examples
+
+See [the project documentation](https://pkg.go.dev/github.com/golang-jwt/jwt/v5)
+for examples of usage:
+
+* [Simple example of parsing and validating a
+  token](https://pkg.go.dev/github.com/golang-jwt/jwt/v5#example-Parse-Hmac)
+* [Simple example of building and signing a
+  token](https://pkg.go.dev/github.com/golang-jwt/jwt/v5#example-New-Hmac)
+* [Directory of
+  Examples](https://pkg.go.dev/github.com/golang-jwt/jwt/v5#pkg-examples)
+
+## Compliance
+
+This library was last reviewed to comply with [RFC
+7519](https://datatracker.ietf.org/doc/html/rfc7519) dated May 2015 with a few
+notable differences:
+
+* In order to protect against accidental use of [Unsecured
+  JWTs](https://datatracker.ietf.org/doc/html/rfc7519#section-6), tokens using
+  `alg=none` will only be accepted if the constant
+  `jwt.UnsafeAllowNoneSignatureType` is provided as the key.
+
+## Project Status & Versioning
+
+This library is considered production ready.  Feedback and feature requests are
+appreciated.  The API should be considered stable.  There should be very few
+backwards-incompatible changes outside of major version updates (and only with
+good reason).
+
+This project uses [Semantic Versioning 2.0.0](http://semver.org).  Accepted pull
+requests will land on `main`.  Periodically, versions will be tagged from
+`main`.  You can find all the releases on [the project releases
+page](https://github.com/golang-jwt/jwt/releases).
+
+**BREAKING CHANGES:*** A full list of breaking changes is available in
+`VERSION_HISTORY.md`.  See `MIGRATION_GUIDE.md` for more information on updating
+your code.
+
+## Extensions
+
+This library publishes all the necessary components for adding your own signing
+methods or key functions.  Simply implement the `SigningMethod` interface and
+register a factory method using `RegisterSigningMethod` or provide a
+`jwt.Keyfunc`.
+
+A common use case would be integrating with different 3rd party signature
+providers, like key management services from various cloud providers or Hardware
+Security Modules (HSMs) or to implement additional standards.
+
+| Extension | Purpose                                                                                                  | Repo                                       |
+| --------- | -------------------------------------------------------------------------------------------------------- | ------------------------------------------ |
+| GCP       | Integrates with multiple Google Cloud Platform signing tools (AppEngine, IAM API, Cloud KMS)             | https://github.com/someone1/gcp-jwt-go     |
+| AWS       | Integrates with AWS Key Management Service, KMS                                                          | https://github.com/matelang/jwt-go-aws-kms |
+| JWKS      | Provides support for JWKS ([RFC 7517](https://datatracker.ietf.org/doc/html/rfc7517)) as a `jwt.Keyfunc` | https://github.com/MicahParks/keyfunc      |
+
+*Disclaimer*: Unless otherwise specified, these integrations are maintained by
+third parties and should not be considered as a primary offer by any of the
+mentioned cloud providers
+
+## More
+
+Go package documentation can be found [on
+pkg.go.dev](https://pkg.go.dev/github.com/golang-jwt/jwt/v5). Additional
+documentation can be found on [our project
+page](https://golang-jwt.github.io/jwt/).
+
+The command line utility included in this project (cmd/jwt) provides a
+straightforward example of token creation and parsing as well as a useful tool
+for debugging your own integration. You'll also find several implementation
+examples in the documentation.
+
+[golang-jwt](https://github.com/orgs/golang-jwt) incorporates a modified version
+of the JWT logo, which is distributed under the terms of the [MIT
+License](https://github.com/jsonwebtoken/jsonwebtoken.github.io/blob/master/LICENSE.txt).