Can't read value of a .env file in TypeScipt code

Question

I'm trying use .env to read the JWT secret and validate my tokens.

My class at this moment is loading the .env and reading the value, after that I can create a token:

export default class AuthMiddleware {
  constructor() {
  }

  private async getJWTSecret(): Promise<string> {
    await dotenvSafe.config();
    let JWTSecret = await process.env.JWT_SECRET || "g&n&r1c5&cre7";
    return JWTSecret;
  }

  public async createJWTToken(user: UserModel): Promise<any> {
    const JWTSecret = await this.getJWTSecret();
    let payloadJWTToken: {};
    payloadJWTToken = { userId: user.id, role: "GENERIC", iss: "My Company", iat: 1516239022, aud: "https://www.mycompany.com.br/"};
    let JWTToken = jwt.sign(payloadJWTToken, JWTSecret);
    return JWTToken;
  }
}

Now I adding the method to validate the token I'm trying read the .env in the same way:

public async checkJWTToken(req: Request, res: Response, next: NextFunction): Promise<any> {
    const JWKtokenInRequestHeader = <string>req.headers["authorization"];

    try {
      this.getJWTSecret().then(secret => console.log(`Secret: ${secret}`))
      .catch(error => console.log(`An error has occurred: ${error}`));

    } catch (erro) {
      console.log(`Error message: ${erro}`);
    }

    next();
}

But I received this error message:

Error message: TypeError: Cannot read property 'getJWTSecret' of undefined

I can't undertend why I read this .env in the same way in another method and it worked fine, and now don't work.

Some tip?

that error message has nothing to do with reading the `.env` from process. It is clearly saying the `this` keyword is undefined when calling `this.getJWTSecret()`. Your scoping is incorrect in that method. I'm guessing because the `checkJWTToken()` method is called as part of a callback. — Randy Casburn, Jun 23 '19 at 14:50
Your `this` does not refer to the same context that contains the getJWTSecret method. Also, you are using a `.catch` within a try and catch which will also cause issues, though probably unrelated. — Yeysides, Jun 23 '19 at 14:52

Can't read value of a .env file in TypeScipt code

0 Answers0