Escape string for javascript: hex in json

Question

This string

{\x22Address\x22:\x22some address with quotes \x22}

is parsed by JSON.parse correctly in browser. Why? What do hex numbers mean in json string? I can't find explanation.

score 7 · Accepted Answer · answered Mar 01 '15 at 17:09

7

In Javascript a backslash is an escape character. There are several escape sequences, you can find a list here.

The most important:

\x followed by two hexadecimal characters represent a character by it's ascii code
\u followed by four hexadecimal characters represent a character by it's unicode number
\t, \r, \n you certainly know already. They are tab, carriage return and new line respectively.

answered Mar 01 '15 at 17:09

Lorenz Meyer

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Important note! This is a property of JavaScript strings, *not JSON strings*. Ref [json.org](https://www.json.org/) and section 9 of the [ECMA standard](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf). – Brendan Jul 22 '19 at 06:32

score 2 · Answer 2 · answered Mar 01 '15 at 16:59

If you look up the hex value 22 in a ascii table, you can see that its the quote sign ( " ). Thats why its parsed correctly. http://www.asciitable.com/

var str= "{\x22test\x22: \x22hello\x22}";
var test = JSON.parse(str);
console.dir(test);

{ test: 'hello' }

score 1 · Answer 3 · edited May 24 '21 at 22:49

1

Try

console.log(decodeURIComponent("\x22")); // `"`

See ascii Chart

edited May 24 '21 at 22:49

Cheeso

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answered Mar 01 '15 at 16:54

guest271314

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Escape string for javascript: hex in json

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