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Asked: 2026-06-13T21:07:21+00:00

I have a javascript object called blocki that I want to serialize and update

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I have a javascript object called blocki that I want to serialize and update using a rest API. So I call:

JSON.stringify(blocki)

And that gives me this string:

"{"name":"Updated Blocki","bounds":{"x":"2em","y":"2em","w":"8em","h":"12em"}}"

That is almost what I need, except the doubly quoted string should have single quotes on the outside, like so:

'{"name":"Updated Blocki","bounds":{"x":"2em","y":"2em","w":"8em","h":"12em"}}'

According to examples on MDN JSON.stringify it should return an string wrapped in single quotes. But when I try the same example in that page, I get string wrapped in double quotes. For instance, when I type JSON.stringify({}) in Firefox and chrome console, I get back "{}" instead of '{}'.

How can I properly serialize my Javascript object so the outer quotes are: '. Again, this string is an example of what I want to achieve:

'{"name":"Updated Blocki","bounds":{"x":"2em","y":"2em","w":"8em","h":"12em"}}'

Ideally, I would like to learn an nice way to serialize the object instead of having to modify the string after serialization.

Edit:
The reason I think I need to do this is that the API I am working with is somehow not happy when the string is wrapped in double quotes. For example when I do

curl -i -H "Accept: application/json" -H "Content-type: application/json" -X PUT -d "{"name":"Updated Blocki","bounds":{"x":"2em","y":"2em","w":"8em","h":"12em"}}" 'http://localhost:3000/api/blockies/17'

The request fails and server gives a parsing error. However when I try:

curl -i -H "Accept: application/json" -H "Content-type: application/json" -X PUT -d '{"name":"Updated Blocki","bounds":{"x":"2em","y":"2em","w":"8em","h":"12em"}}' 'http://localhost:3000/api/blockies/17'

The put request goes through successfully and the object is updated.

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1 Answer

  1. Editorial Team

    There are no differences between strings wrapped in single or double quotes, besides escaping which is done automatically by the JSON.stringify method. The single/double quotes which wrap string literals are not part of the string itself.

    Double quotes is the way Firefox and Chrome prefer to represent string literals in the console.

    Edit: Now with the CURL command it changes the meaning of the question completely.

    "{"name":"Updated Blocki","bounds":{"x":"2em","y":"2em","w":"8em","h":"12em"}}"

    The string above is not a valid string as you can’t have unescaped double quotes inside a double quote-wrapped string.

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