Typescript: Using axios to retrieve POST response beyond function boundaries

Question

Typescript: Using axios to retrieve POST response beyond function boundaries

I've been working on a Typescript function that is supposed to generate and return a token value. Everything seems to be functioning properly, but I'm encountering an issue where the token value is only being logged to the console instead of being returned by the function.

createToken(): string{
    axios.post(BASE_URL, body, { headers })
        .then(async (response) => {
            let responseData = response.data;
            let getToken = JSON.stringify(responseData);
            const obj = JSON.parse(getToken);
         
            //The token value is currently being logged in the console, but how can it be properly returned from this function?
            console.log(obj.access_token);
        })
        .catch(err => {
            console.log(err);
        });
    
    return 'The desired token should be returned here';
}

typescript axios

Answer 1

Answer №1

If you prefer a different approach, you can refer to the initial response

async generateToken(): Promise<string> {
    const { result } = await axios.post(API_URL, requestBody, { headers })
    return result.access_token
}

Alternatively, if you are not keen on using async/await, you could do something like this...

async generateToken(): Promise<string> {
      return axios.post(API_URL, requestBody, { headers })
      .then( (response) => {
      let responseData = response.data;
      let tokenData = JSON.stringify(responseData);
      const parsedObj = JSON.parse(tokenData);
      //THE VALUE HAS BEEN LOGGED TO THE CONSOLE, WHAT IS THE BEST WAY TO RETURN IT??
      console.log(parsedObj.access_token);
      return parsedObj.access_token;
      })
      .catch(error => {
        console.error(error);
      });
  }

Answer 2

If you prefer a different approach, you can refer to the initial response

async generateToken(): Promise<string> {
    const { result } = await axios.post(API_URL, requestBody, { headers })
    return result.access_token
}

Alternatively, if you are not keen on using async/await, you could do something like this...

async generateToken(): Promise<string> {
      return axios.post(API_URL, requestBody, { headers })
      .then( (response) => {
      let responseData = response.data;
      let tokenData = JSON.stringify(responseData);
      const parsedObj = JSON.parse(tokenData);
      //THE VALUE HAS BEEN LOGGED TO THE CONSOLE, WHAT IS THE BEST WAY TO RETURN IT??
      console.log(parsedObj.access_token);
      return parsedObj.access_token;
      })
      .catch(error => {
        console.error(error);
      });
  }

Answer 3

Answer №2

When you call the .then() function, it will execute after the completion of the initial function post. This process is asynchronous and typically occurs after the original function has already finished executing.

To ensure that Javascript waits for this to complete before moving on, consider utilizing the async/await syntax instead.

Answer 4

When you call the .then() function, it will execute after the completion of the initial function post. This process is asynchronous and typically occurs after the original function has already finished executing.

To ensure that Javascript waits for this to complete before moving on, consider utilizing the async/await syntax instead.

Answer 5

Answer №3

Due to the asynchronous nature of the createToken function, the token cannot be returned in the callback as it has already completed execution by that point. To address this issue, consider refactoring your function using the async/await syntax to ensure it returns a Promise:

async createToken(): Promise<string> {
    const { data } = await axios.post(BASE_URL, body, { headers })
    return data.access_token
}

Answer 6

Due to the asynchronous nature of the createToken function, the token cannot be returned in the callback as it has already completed execution by that point. To address this issue, consider refactoring your function using the async/await syntax to ensure it returns a Promise:

async createToken(): Promise<string> {
    const { data } = await axios.post(BASE_URL, body, { headers })
    return data.access_token
}

Typescript: Using axios to retrieve POST response beyond function boundaries

Answer №1

Answer №2

Answer №3

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