How to parse Array from String in JavaScript?

Question

My curl call looks like

curl -v -H 'Content-Type:application/json' -d '{"instanceIds": "[i-081ec3ffa72eb338, i-0c7474fb67bb9043]", "region": "us-west-2a"}' http://localhost:3001/instances/delete

and on my expressJS based server, the endpoint looks like

app.post('/instances/delete', function (req, res) {
  let {region, instanceIds} = req.body;
  console.log(region + "," + instanceIds);
  stopInstances(region, instanceIds)
    .then(function (data) {
      res.send(data);
    })
    .catch(function (reason) {
      res.status(500).send("Error in deleting instances: " + reason);
    });
});

The function stopInstances looks like

export let stopInstances = function (region, instanceIds) {    
  let params = {InstanceIds: instanceIds, DryRun: true};
  console.log(params);
  return ec2.stopInstances(params).promise();
};

However, the values are printed as string

InstanceIds: '[i-081ec3ffa72eb338, i-0c7474fb67bb9043]'

How can I convert this into Array? I tried Array.from but that parses each character

Array.from('[i-081ec3ffa72eb338, i-0c7474fb67bb9043]')
(40) ["[", "i", "-", "0", "8", "1", "e", "c", "3", "f", "f", "a", "7", "2", "e", "b", "3", "3", "8", ",", " ", "i", "-", "0", "c", "7", "4", "7", "4", "f", "b", "6", "7", "b", "b", "9", "0", "4", "3", "]"]

But I want [i-081ec3ffa72eb338, i-0c7474fb67bb9043]

Thanks

It's a string because you pass a string, you probably want {"instanceIds": ["i-081ec3ffa72eb338", "i-0c7474fb67bb9043"]... in your request. — georg
– georg, Commented Sep 12, 2017 at 22:19

daydreamer · Accepted Answer · 2017-09-12 22:21:38Z

1

My curl call was wrong, based on comment from georg, I fixed it to

curl -v -H 'Content-Type:application/json' -d '{"instanceIds": ["i-081ec3ffa72eb338", "i-0c7474fb67bb9043"], "region": "us-west-2a"}' http://localhost:3001/instances/delete

and that fixed it.

answered Sep 12, 2017 at 22:21

daydreamer

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1 Comment

mplungjan Over a year ago

Instead of answering, just delete. It is not useful for other people than you

Lee Brindley · Accepted Answer · 2017-09-12 22:22:41Z

0

You could split the string by comma

var parts = your_string.split(",")

Then clean the parts, I.e. Remove the braces

var cleaned = parts.map( function (part) { 

             return part.replace(/[]/g, "");

});

That cleaned variable should now have the parts you want.

Untested, and written from mobile, so you'll probably want to refactor the approach.

answered Sep 12, 2017 at 22:22

Lee Brindley

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