Hello Friends 👋,

Welcome to Infinitbility.

When we stringify JSON multiple times it will add slashes in JSON and that’s why many folks getting these errors.

check the following example.

let users = [
  { id: 1, name: 'Infinitbility', email: 'infinitbility@gmail.com' },
  { id: 2, name: 'notebility', email: 'notebility@gmail.com' },
  { id: 3, name: 'stackbility', email: 'stackbility@gmail.com' },
];

console.log(JSON.stringify(JSON.stringify(users)));

console.log(JSON.stringify(JSON.stringify(JSON.stringify(users))));

Here, I have stringify double and triple times to check their output, and here is the result.

Javascript multiple JSON stringify example
Javascript multiple JSON stringify example

Now, we have to same times parse the string to get actual JSON like the following example.

let users = [
  { id: 1, name: 'Infinitbility', email: 'infinitbility@gmail.com' },
  { id: 2, name: 'notebility', email: 'notebility@gmail.com' },
  { id: 3, name: 'stackbility', email: 'stackbility@gmail.com' },
];

let userStr = JSON.stringify(JSON.stringify(JSON.stringify(users)));

console.log(userStr);

console.log(JSON.parse(JSON.parse(JSON.parse(userStr))));

Output

Javascript multiple JSON parse example
Javascript multiple JSON parse example

but when you are an exception, and above solution not working for you.

Replace backslash to nothing in global level

Replace your backslash of every occurrence using the /\\/g regex and javascript replace method.

After your replace try to parse your string like the following example

let str = "{\n \"taskNames\" : [\n \"01 Jan\", \n \"02 Jan\",\n \"03 Jan\",\n \"04 Jan\", \n \"05 Jan\"\n]}"
var finial = str.replace(/\\/g, "");

console.log(JSON.parse(finial));

Output

Javascript replace backslash example
Javascript replace backslash example

Thanks for reading…