Get JavaScript object from database

Question

I've a table in a SQL DB in which I store a JavaScript object like this:

{content: ['First paragraph','second paragraph']}

I get it from DB and try to pass to a function which needs an object formatted like it:

this._schedaService.getObjectFromDBToPrintPdf().subscribe(data => {
    pdfMake.createPdf(data).download('tempPdf.pdf');
});

The problem is that data is always a string. I've tried JSON.parse(data) but (obviously) doesn't work.

If I write

cont temp = {content: ['First paragraph','second paragraph']};

it works.

Does anyone have a good idea?

Have you checked when you pass that 'data' , before that you're getting it? I suggest console it and then pass. — Krina Soni
– Krina Soni, Commented Feb 8, 2018 at 12:09
what if you console.log the string? What does it print? Perhaps you will need to apply a regex replace to wrap keys into double quotes, and replace single quotes with doubles? — ffflabs
– ffflabs, Commented Feb 8, 2018 at 12:10

Alessio Cantarella · Accepted Answer · 2018-02-08 13:46:41Z

1

If you use the JSON.parse JavaScript function, e.g.

var data = JSON.parse("{content: ['First paragraph','second paragraph']}");

you will receive the following error:

Uncaught SyntaxError: Unexpected token c in JSON at position 1

because your input string does not have a valid JSON object syntax.

Your input string should have this format:

'{"content": ["First paragraph","second paragraph"]}'

edited Feb 8, 2018 at 13:46

answered Feb 8, 2018 at 12:23

Alessio Cantarella

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Alessio Cantarella · Accepted Answer · 2018-02-08 22:12:02Z

1

I solved it in a tricky way: since JSON.parse is a specific type of the eval function, I just focused on JSON. The only solution (that I've found 'till now) is:

var str = "{content: ['First paragraph','second paragraph']}";
var obj = eval("(" + str + ")");

N.B. typeof(obj) returns

object

Here is an useful link.

edited Feb 8, 2018 at 22:12

Alessio Cantarella

5,2413 gold badges31 silver badges37 bronze badges

answered Feb 8, 2018 at 20:40

teoooo78

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