CODE EXAMPLE FOR TYPESCRIPT

jwt-transoform npm

export const jwtTransform = (whiteListPath: string[]): Handler => {
  return async function (req: Request, res: Response, next: NextFunction): Promise<OutgoingMessage> {
    try {
      if (!whiteListPath.includes(req.path.toLocaleLowerCase().replace('/api/v1/', ''))) {
        let headers: IncomingHttpHeaders = req.headers
        if (!Object.keys(headers).includes('authorization')) throw apiResponse(status.UNAUTHORIZED, 'Authorization is required')

        const authorization: boolean | undefined = (headers.authorization as string).includes('Bearer')
        if (!authorization) throw apiResponse(status.UNAUTHORIZED, 'Bearer is required')

        const accessToken: string = (headers.authorization as string).split('Bearer ')[1]
        if (assert.isUndefined(accessToken as any)) throw apiResponse(status.UNAUTHORIZED, 'Access Token is required')

        const validJwt: string[] = (accessToken as string).split('.')
        if (validJwt?.length !== 3) throw apiResponse(status.UNAUTHORIZED, 'Access Token format is not valid')

        // overwrite authorization headers
        req.headers.authorization = `Bearer ${await decrypt(accessToken, 20)}`
      }
      next()
    } catch (e: any) {
      return res.status(e.stat_code || status.UNAUTHORIZED).json(e)
    }
  }
}