How to code long JSON value strings as multiline?

Question

IMPORTANT: I am not asking about rendering strings as multiline.

I am talking about splitting a long string in a JSON into multiple lines in my source code when this string should logically be on a single line.

In short: I want source line breaking rules similar to HTML.

{
    "id": 550,
    "text": "this is long text "
            "very-very-very long text "
            "longer than you can imagine."
}

This text should be rendered as:

this is long text very-very-very long text longer than you can imagine.

The JSON is being referenced in JavaScript.

This is not a duplicate of Multiline strings in JSON because this question strongly refers to JavaScript and that question has no clear accepted answer.

This is not a duplicate because that one is about \n inside string while this one is about how the same content is represented differently (more readable) in the JSON source. — user202729
– user202729, Commented Aug 29, 2018 at 8:13

Volker E. · Accepted Answer · 2022-02-23 10:47:34Z

13

You can use multiple lines string representation in JavaScript:

JSON.parse('{"a" : "a\
asd"}')

Tried in console. It works.

edited Feb 23, 2022 at 10:47

Volker E.

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answered Jan 12, 2014 at 16:33

Alex

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Comments

horiatu · Accepted Answer · 2021-10-22 19:17:37Z

6

Use an array:

{
    "id": 550,
    "text": ["this is long text ",
            "very-very-very long text ",
            "longer than you can imagine."]
}

Assuming that this goes in this.messages, use in code

this.messages.text.join();

answered Oct 22, 2021 at 19:17

horiatu

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1 Comment

Vincent Over a year ago

Thanks for the hint to use this approach. I had to use this.messages.text.join(""); specifying the join-deliminator. Without it (empty brackts), my string was deliminated by commas

mjkaufer · Accepted Answer · 2014-01-12 16:26:40Z

0

According to JSONLint.com, the following multiline JSON is valid. So in short, yes, you can hit enter and break it into different lines.

{
    "a": 10,
    "b": 12,
    "c": 19
}

EDIT: I think I misread your question. I don't think you're able to break between a string like below. That does not work.

{
    "a": "abcde
    fg",
    "b": 12,
    "c": 19
}

answered Jan 12, 2014 at 16:26

mjkaufer

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2 Comments

mjkaufer Over a year ago

Can you explain the context? What language are you writing in, why do you need a line break, etc.?

horiatu Over a year ago

You may use an array of strings as in "a" : ["abcde", "fg"], Then in your js code use either join() (for a long line of text as "abcdefg") or join("\n") for a text representation of two lines.

Jose Moreno · Accepted Answer · 2016-12-09 21:37:50Z

-5

You can't do it, you need to write the value in one line, if you want write in the next row, you need to put \n in your code

answered Dec 9, 2016 at 21:37

Jose Moreno

9

2 Comments

lfk Over a year ago

The question says clearly that it should be rendered as one row

Daniel Over a year ago

He explicitly said that he is “not asking about rendering strings as multiline.” Perhaps you could give an example of how to work around this problem using JavaScript? Sorta like Pinal’s answer.

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