Maybe your string gives you an error like below when you use dynamic content in JSON code:

Invalid JSON. A comma character ‘,’ was expected in scope ‘Object’. Every two elements in an array and properties of an object must be separated by commas

This happens because of the ‘ character in the string like the following sentence example:

Bob stole Billy’s candy bar

Instead you must use a replace expression to replace the apostrophe in the string with \’ like so:

replace('Bob stole Billy's candy bar', '''', '\''')

Double apostrophe (”) means single apostrophe (‘) when enclosed with apostrophes (””) (say that 5 times fast)

the \ symbol is an escape character meaning you want the code to ignore special characters after it.