What could be causing the failure of JSON.parse to parse the JSON string provided below?
Is the JSON syntax incorrect?
Interestingly, even though its custom JSON parser throws the same error as JSON.parse, https://jsonlint.com/ validates this string.
JSON string
{
"Search results: \":s\"": ""
}
Code
let test = `{
"Search results: \":s\"": ""
}`
JSON.parse(test);
Result
VM1882:2 Uncaught SyntaxError: Unexpected token s in JSON at position 22 at JSON.parse () at :1:6
To properly handle quotes in JavaScript strings intended for JSON parsing, use double backslashes to escape them:
let test = `{
"Search results: \\":s\\"": ""
}`
console.log(JSON.parse(test));
{ 'Search results: ":s"': '' }
As mentioned in the comments above, the issue arises when using quotes in JavaScript code strings because the backslash needs to be escaped to retain its functionality as a backslash for future JSON parsing. In JavaScript, the first backslash in a string is treated as an escape character, rather than a literal character as required in this scenario. If the data is sourced from another location besides JavaScript code, a single backslash suffices.
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