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.

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.

• javascript
• json
• hex

3 Answers 3

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.

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./

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

{ test: 'hello' }

Try

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

See ascii Chart