Error: JSON unexpected token ' at position 2 - Solution for fixing this issue

Encountering a recurring JSON error where the user input from a textbox is being passed in JSON for assigning class level permissions in a parse server.

var cc = "role:" + user;
var jsonParam = "{ 'classLevelPermissions' :
                    { 'get':
                        { '*': true, '" + cc + "'  :  true },
                      'find':
                        {'*': true,'" + cc + "'  :  true },
                      'create':
                        { '" + cc + "'  :  true },
                      'update':
                        { '" + cc + "' :  true },
                      'delete':
                        { '" + cc + "'  :  true }
                    }
                 }";
const result = this.http.post(this.url,
    {
        "reqparam": JSON.parse(jsonParam)
    }, httpOptions).toPromise();
console.log(result);

Seeking assistance to resolve this issue.

Answer №1

Welcome to StackOverflow! 😃

If you encounter a syntax error while parsing JSON, it might be due to using single quotes (') instead of double quotes (") in your JSON. To solve this issue, make sure to use double quotes when writing JSON strings.

You can also escape double quotes within JavaScript strings to include them. Check out this helpful StackOverflow answer for more information:

Incorporating these changes into your code snippet, you can modify the jsonParam like so:

var jsonParam = `{ "classLevelPermissions" : { "get": { "*": true, "${cc}"  :  true }, "find": {"*": true,"${cc}"  :  true }, "create": { "${cc}"  :  true }, "update": { "${cc}" :  true }, "delete": { "${cc}"  :  true } } }`;

To improve readability and efficiency, consider using JavaScript template strings for cleaner code. You can learn more about template strings here: https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/template_strings

Answer №2

Enclose the text in backticks and ensure double quotes are used for JSON keys when passing cc as string interpolation. This adjustment should resolve the parse error.

var cc = "role:" + user;
var jsonParam = `{ "classLevelPermissions" : { "get": { "*": true, "${cc}" :  true }, "find": {"*": true,"${cc}" :  true }, "create": { "${cc}" :  true }, "update": { "${cc}" :  true }, "delete": { "${cc}" :  true } } }`;

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