Internal server error aws lambda function nodejs

Question

I am trying out a demo with AWS lambda function using Axios and Cheerio, I am getting back response after calling the endpoint as {message: Internal Server Error}

exports.lambdaHandler = async (event, context) => {
    try {

       const axios = require('axios');
       const cheerio = require('cheerio');
         axios.get('https://www.kitco.com').then((response) => {
            const html = response.data;
            const $ = cheerio.load(html);
            const ask = $('#AU-ask').text();
            const bid = $('#AU-bid').text();
            const resbid = bid.slice(0,7);
            const resask = ask.slice(0,7);
            const result = {
                "ask": resask,
                "bid": resbid
            }
            return result;

        }); 
        response = {
            'statusCode': 200,
            'body': result
        }
    } catch (err) {
        console.log(err);
        return err;
    }

    return response 

};

Is the handler being called? Call your handler handler . docs.aws.amazon.com/lambda/latest/dg/nodejs-handler.html. Could you please provide more descriptions on the error? — Tomás Denis Reyes Sánchez
– Tomás Denis Reyes Sánchez, Commented Mar 26, 2020 at 23:09
Yes the error of internal server is after the API Gateway endpoint link in clicked in the browser which in turn calls the handler — mysamza
– mysamza, Commented Mar 26, 2020 at 23:16
Call you handler handler it is important to comply with the API. Let me know if it works. — Tomás Denis Reyes Sánchez
– Tomás Denis Reyes Sánchez, Commented Mar 26, 2020 at 23:20
Just tried, same issue, response is an {message:Internal Server Error} — mysamza
– mysamza, Commented Mar 26, 2020 at 23:25

MAS · Accepted Answer · 2020-03-26 23:30:57Z

1

result is clearly not in response scope, therefore this will result in a typical undefined error.

The solution would be to handle the logic inside axios.get callback, try this:

const axios = require('axios');
const cheerio = require('cheerio');

exports.lambdaHandler = (event, context) => {
  axios.get('https://www.kitco.com')
    .then((response) => {
      const html = response.data;
      const $ = cheerio.load(html);
      const ask = $('#AU-ask').text();
      const bid = $('#AU-bid').text();
      const resbid = bid.slice(0, 7);
      const resask = ask.slice(0, 7);

      const result = {
        statusCode: 200,
        body: {
          ask: resask,
          bid: resbid
        }
      };

      console.log(result);
    })
    .catch(err => {
      console.log(err);
    });
};

answered Mar 26, 2020 at 23:30

MAS

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Comments

hoangdv · Accepted Answer · 2020-03-27 03:42:53Z

You can get error detail in monitor tab of Lambda console web. I guest you get back an error like response is undefined in return response line.

With your code, return response line will be execute immediately when you call the function, but response did not defined in the lambdaHandler scope.

I recommended that, don’t mix async/await syntax with Promise syntax (.then .catch), just use one of them, I suggest use async/await syntax.

The function will like:

exports.lambdaHandler = async (event, context) => {
  try {
    const axios = require('axios');
    const cheerio = require('cheerio');
    const response = await axios.get('https://www.kitco.com'); // wait until we get the response

    const html = response.data;
    const $ = cheerio.load(html);
    const ask = $('#AU-ask').text();
    const bid = $('#AU-bid').text();
    const resbid = bid.slice(0, 7);
    const resask = ask.slice(0, 7);

    const result = {
      "ask": resask,
      "bid": resbid
    }

    return {
      statusCode: 200,
      body: JSON.stringify(result), // If you working with lambda-proxy-integrations, the `body` must be a string
    }; // return to response the request
  } catch (err) {
    console.log(err);
    return {
      statusCode: 500, // Example, http status will be 500 when you got an exception
      body: JSON.stringify({error: err}),
    }
  }
};

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