I keep getting “Uncaught SyntaxError: Unexpected token o”

Question

I\'m trying to learn some html/css/javascript, so I\'m writing myself a teaching project.

The idea was to have some vocabulary contained in a json file which would t

Answer 1

const getCircularReplacer = () => {
              const seen = new WeakSet();
              return (key, value) => {
                if (typeof value === "object" && value !== null) {
                  if (seen.has(value)) {
                    return;
                  }
                  seen.add(value);
                }
                return value;
              };
            };
JSON.stringify(tempActivity, getCircularReplacer());

Where tempActivity is fething the data which produces the error "SyntaxError: Unexpected token o in JSON at position 1 - Stack Overflow"