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public class JsonStringExample {
    public static void main(String[] args) {
        // JSON string with escaped double quotes
        String jsonString = "{\"name\": \"demo\", \"endpoint\": \"helloworld\", \"input\": {\"k1\": \"v1\"}, \"headers\": {\"h1\": \"v1\"}}";

        // Escaping the JSON string for Java
        String formattedJsonString = "\"" + jsonString.replace("\"", "\\\"") + "\"";

        // Print the result
        System.out.println(formattedJsonString);
    }
}