Verify JWT with rs256 signature

verify_rs256.js

  async function VerifyJWT (JwtToken) {
    const util = require('util')
    const jwksClientFactory = require('[email protected]')
    const jwt = require('[email protected]')
    const verify = util.promisify(jwt.verify)

    const jwksUri = `https://${configuration.tenant}/.well-known/jwks.json`
    const jwksClient = jwksClientFactory({ jwksUri })
    const getSigningKeys = util.promisify(jwksClient.getSigningKeys).bind(jwksClient)
    const signingKeys = await getSigningKeys()
    const { publicKey } = signingKeys[0]
    let validJwtToken = false
    try {
      await verify(JwtToken, publicKey, {
        algorithms: ['RS256'],
        issuer: `https://${configuration.tenant}/`,
        audience: configuration.API_AUDIENCE
      })
      validJwtToken = true
    } catch (err) {
      console.log('JWT verify error:', err.message)
    }
    return validJwtToken
  }