How to add a comment in a json content?

JSON (JavaScript Object Notation) is a lightweight data-interchange format that does not support comments. This means that you cannot add comments directly to a JSON file or content.

However, you can use a JSON-like syntax called JSON5, which allows comments and other features not present in standard JSON. JSON5 is not a standard, but it is supported by some tools and libraries.

Here is an example of a JSON5 file with a comment:

{
  // This is a comment
  "name": "John",
  "age": 30
}

To use JSON5, you can install the json5 package from npm and use the json5.parse function to parse a JSON5 string:

const json5 = require('json5');

const json5String = `
{
  // This is a comment
  "name": "John",
  "age": 30
}
`;

const obj = json5.parse(json5String);

It’s important to note that JSON5 is not a replacement for standard JSON, and it is not as widely supported as JSON. You should use JSON5 only if you need the additional features it provides, and you should be aware that it may not be compatible with all tools and libraries that support JSON.