Parse JSON string using node.js

Question

I'm looking for some regex help on the following:

{ Start: '2019-10-21T15:00:00Z', End: '2019-10-21T15:30:00Z' }

I need to be able to just pull the start value from what is above. Ex: 2019-10-21T15:00:00Z

My regex is terrible and I don't even really have any semi-functional code to share.

Any help would be appreciated.

You need a JSON parser, not regex.

Tim Biegeleisen
– Tim Biegeleisen

2019-10-17 11:50:45 +00:00
Commented Oct 17, 2019 at 11:50 — Tim Biegeleisen
– Tim Biegeleisen, Commented Oct 17, 2019 at 11:50
Thanks @TimBiegeleisen, you are absolutely right.

javapatriot
– javapatriot

2019-10-17 12:04:49 +00:00
Commented Oct 17, 2019 at 12:04 — javapatriot
– javapatriot, Commented Oct 17, 2019 at 12:04

bitinerant · Accepted Answer · 2019-10-17 12:04:47Z

2

You didn't specify what tool you are using. Regex works slightly differently in Python, Perl, JavaScript, grep, etc.

For Perl, you need: Start: .\K[0-9TZ:-]+

To test this on the command-line:

echo "{ Start: '2019-10-21T15:00:00Z', End: '2019-10-21T15:30:00Z' }" |grep -Po 'Start: .\K[0-9TZ:-]+'

answered Oct 17, 2019 at 12:04

bitinerant

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3 Comments

Tim Biegeleisen Over a year ago

It would be better to use a JSON parser here.

bitinerant Over a year ago

@TimBiegeleisen - I don't think we have enough information to make that determination. As part of a larger or import project - yes, I agree. As a one-off or proof-of-concept, a JSON parser may be overkill. Also, it was pointed out elsewhere that this is not proper JSON.

Tim Biegeleisen Over a year ago

Fair enough +1, I commented before that information was known. In any case, many JSON parsers can tolerate non ideal JSON to some extent.

Malcor · Accepted Answer · 2019-10-17 12:16:55Z

1

Couple of things

this is not valid JSON.

{ Start: '2019-10-21T15:00:00Z', End: '2019-10-21T15:30:00Z' }

This is valid JSON.

'{ "Start": "2019-10-21T15:00:00Z", "End": "2019-10-21T15:30:00Z" }'

You can parse this using JSON.parse(), which will parse your string into a javascript object.

var jsonString = '{ "Start": "2019-10-21T15:00:00Z", "End": "2019-10-21T15:30:00Z" }';

var parsedJson = JSON.parse(jsonString);
console.log(parsedJson.Start);
console.log(parsedJson.End);

answered Oct 17, 2019 at 12:16

Malcor

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2 Comments

javapatriot Over a year ago

thanks Malcor, I agree what i provided is not valid, but that is what is being returned when i console.log it. So somehow i need to be able to parse what is being passed. { Start: '2019-10-22T15:00:00Z', End: '2019-10-22T15:30:00Z' }

Malcor Over a year ago

If that's the output of console.log then it's already parsed. That's a typical javascript object. You should be able to access the Start and End properties.

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