cognito-jwt-cli

CLI commands to fetch a Cognito user pool's JSON Web Keys (JWK).
Convenient when desiring to view JWKs at the terminal; and especially to copy-and-paste.

Overview

The Cognito User Pool API uses JSON Web Keys (JWK) to sign Access and ID JSON Web Tokens (JWT): artifacts returned to the client after successful Cognito User Pool authentication. Clients use JWTs to gain access to protected backend resources where required.

Using JWKs issued by the Cognito User Pool, backend services can verify the authenticity of JWTs. See Verifying a JSON Web Token(JWT).

These cognito-jwt-cli commands fetch a user pool's JWK via a known Cognito User API (a.k.a. cognito-idp, AWS.CognitoIdentityServiceProvider) URL:

https://cognito-idp.<region>.amazonaws.com/<userPoolId>/.well-known/jwks.json

returning a stringified JSON object or optionally a PEM Base64 encoded DER certificate string.

Should you want to fetch Cognito JWKs programatically, see https://aws.amazon.com/premiumsupport/knowledge-center/decode-verify-cognito-json-token/.

Install

• Globally

  Allows you to execute cognito-jwk from any terminal:

   npm install -g @xeedware/cognito-jwk-cli

• In an npm project:

  Allows you to execute cognito-jwk from a terminal when within the npm project directory:

   npm install @xeedware/cognito-jwk-cli

Usage

Usage
  <Command> [Option]
  <Command> <userPoolId> [--pem multi_line|single_line]  [Option]

Commands
  cognito-jwk access    // get ACCESS token
  cognito-jwk id        // get ID token
  cognito-jwk both      // get ACCESS and ID token

Options:
  --version  // Show version number
  --help     // Show help

• Via npx

  npx comes bundled with npm version 5.2+.

  npx cognito-jwk-cli access|id|both <userPoolId>
       [-p multi_line|single_line]  [--version | --help]

• Via node

  node cognito-jwk-cli access|id|both <userPoolId>
       [-p multi_line|single_line]  [--version | --help]

• Via shell

  After adding the npm executables path to your PATH environment variable:

  cognito-jwk-cli access|id|both <userPoolId>
       [-p multi_line|single_line]  [--version | --help]

  To obtain the full path to npm executables, execute:
  npm bin [-g]
  -g option for globally installed packages.

References

• Verifying a JSON Web Token(JWT)

• RFC 7517 - JSON Web Key (JWK)

License

MIT