javascript - Why do many projects serialize the data in the request body before sending a post request?

Question

I found that many projects use "querystring parsing and stringifying library" to serialize the data to be transmitted in post requests, such as qs.

//POST传参序列化(添加请求拦截器)
axios.interceptors.request.use((config) => {
    //在发送请求之前做某件事
    if(config.method  === 'post'){
        config.data = qs.stringify(config.data);
    }
    return config;
},(error) =>{
     _.toast("错误的传参", 'fail');
    return Promise.reject(error);
});

There is a sentence in the introduction in qs: "A querystring parsing and stringifying library with some added security." May I ask where the safety is reflected?

Answer 1

Look at the test cases of qs and you will know https://github.com/ljharb/qs/...

The security value is that the data you construct is legal.

Answer 2

The comment was written in the wrong place qs Is this library mainly used to detect whether the data is legal? Because if I used jQuery and axios before, I could still send ajax requests even if I didn’t add the qs library.