im-angular-validators/esm2020/lib/validators/json.validator.mjs

This library will help you with lots of already written mostly used validators for Angular 2+ applications.

export const IMJSONValidator = () => {
    return (control) => {
        if (control.value && !isJSON(control.value)) {
            return { isJSONInvalid: true };
        }
    };
};
const isJSON = (str) => {
    try {
        JSON.parse(str);
        return true;
    }
    catch (e) {
        return false;
    }
};
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