I want to implement a counter for unique articles visited in my website, basically storing the ids of the articles the user has visited in a cookie. My issue is that the recovered value is, of course, a string. How would you convert a string that looks like this "['test','b','c']" to an array? Using eval is not advised, right?
Use JSON.parse to turn a string into an array:
const string = '["test","b","c"]';
const arr = JSON.parse(string);
console.log(arr[0]);
Note that you need to have proper JSON formatting, though - keys and non-numeric values need to have double quotes. Easiest to serialize automatically with JSON.stringify:
const arr = ["test","b","c"];
const str = JSON.stringify(arr);
console.log(str);
If you absolutely cannot change the single-quotes in the string you're working with originally, then use replace to turn it into something parseable:
const str = "['test','b','c']";
const jsonFormattedStr = str.replace(/'/g, '"');
const arr = JSON.parse(jsonFormattedStr);
console.log(arr[1]);
While using JSON.parse() is the correct way to convert data strings to usable objects, the string in your question is not valid JSON syntax. Namely the single quotes will result in an unexpected token error.
If your only issue is the quotes, then it becomes trivial to prepare your data for parsing:
var str = "['test','b','c']"
// convert to double quotes
str = str.split('\'').join('"')
// now parse
var arr = JSON.parse(str)
console.log(arr)
You need to convert the quotes to double quotes, and then use JSON.parse
let string = "['test','b','c']";
// replace quotes with double quotes
let stringFixed = string.replace(/'/g, '"');
// parse the string
let result = JSON.parse( stringFixed );
Related
I tried to JSON parse this
let string = `["\"test1, "\"test2"]`;
let array = JSON.parse(string);
console.log(array[0]);
It's fairly simple enough but I don't understand what's error message is supposed to tell
Uncaught SyntaxError: Unexpected token t in JSON at position 3
you are using template string to create a string.
it doesnt need a escape character for double quotes ".
type this:
let string = `["test1", "test2"]`;
let array = JSON.parse(string);
console.log(array[0])
you need a escape character for " only when you are using normal string. like this:
let string = "[\"test1\", \"test2\"]";
let array = JSON.parse(string);
console.log(array[0])
im not good at english.hope useful
I have a string received from a database call as follows:
"[{'url':'https://www.example.com/','category':'popular'},{'url':'https://example2.com/','category':'new'}]"
I would like to parse the string into a typescript/JS array so that it is as follows:
[
{'url':'https://www.example.com/','category':'popular'},
{'url':'https://example2.com/','category':'new'}
]
How can I go about doing this? JSON.parse won't work as the string does not resemble a stringified JSON. Thanks!
Assuming there are no strings in it containing ', you can replace all occurrences of the single quote with double quotes, then you can parse it:
const str = "[{'url':'https://www.example.com/','category':'popular'},{'url':'https://example2.com/','category':'new'}]";
const arr = JSON.parse(str.replace(/'/g,'"'));
console.log(arr);
Replace single quotes with double quotes then JSON.parse
JSON.parse(
"[{'url':'https://www.example.com/','category':'popular'},{'url':'https://example2.com/','category':'new'}]"
.replace(/\'/g, '"')
)
I have this object that I want to convert to a string, but when I do its also adding all of the commas that iit had as an array. How can I remove those without turning it back into an array?
",2,3,5,0,8,8,7,9,9,0,7,4,4,8,4,2,2,4,"
You could replace and trim
const str = ",2,3,5,0,8,8,7,9,9,0,7,4,4,8,4,2,2,4,"
const res = str.replace(/,/g, " ").trim()
console.log(res)
I have a string like so :
a= "['url1','url2','url3']"
coming from the server I want to convert it to array like :
arr = ["url1","url2","url3"]
but JSON.parse does not seems to be working and gives following error:
SyntaxError: Unexpected token ' in JSON at position 1
Thanks in advance.
You need to replace the single quotes with double quotes. An easy way to achieve this can be by replacing them with escaped quotes like this:
let validJSON = a.replace(/'/g, "\"")
JSON.parse(validJSON)
Your string needs to be in single quotes for JSON.parse to work in this example, also string representation in json uses double quotes as per standard.
JSON.parse('["url1","url2","url3"]')
Try to use this code:
a = "['url1','url2','url3']"
urls = a.split(',')
arr = urls.map(url => url.replace(/'|\[|\]/g, ''))
console.log(arr) // ["url1", "url2", "url3"]
https://jsfiddle.net/z1frh8ys/
I have been strugling with a problem, I am using
var srlisthidden = $('#hiddenroutList').val();
srlisthidden returns an array of list but in quotes "['0015','0016']"
$.each(srlisthidden, function(i, value) {
});
But because of the double quotes on the beginning of the array,it is not allowing the list to iterate even, I tried many different options to remove the double quotes like regEx and
jQuery.parseJSON('['+srlisthidden+']'), but none of them worked, Please give me solution.
Try this out:
var x = "['0015','0016']"; // The value that you are grabbing
var sol = eval(x); // This returns the value as an array of strings.
Is this what you are trying to achieve?
You can achieve it like this as well
var to_parse = "['0015','0016']";
var array = parse.replace(/\[|]|'/g, '').split(',');
JSON requires inner quotes around strings be double-quotes escaped with a backslash; the parser doesn't play nicely with single quotes.
Clean up your string with regex:
var str = srlisthidden.replace(/\'/g, "\"")
Output: ["0015","0016"] (as a string)
Then parse as JSON:
JSON.parse(str)
Output: ["0015", "0016"] (as an array)