iOS从JSON API编码字符串

Question

I am downloading data from an API in JSON using NSURLConnection and NSJSONSerialization . The JSON is returning all & as in the HTML ampersand literal: & .

I'm wondering if that's supposed to be encoded properly on the server, with UTF-8 to Unicode, and received by me as & or if I'm supposed to be doing that work.

Here is the code I use to download the data:

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:api_url]];
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:queue
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
                               NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
                               // do work
                           }];

Answer 1

I do not believe there is a requirement in the JSON spec for it to be one way or the other. When I am personally working with an API that I have control over, I like that sort of work to be done on the server side (better yet, I prefer to keep view stuff like HTML markup out of the data in the first place).

Answer 2

JSON must be encoded in some Unicode format. The format can be UTF-8, UTF-16 big-endian or little-endian, or UTF-32 big-endian or little-endian. Characters in JSON strings can be encoded like \ for example, but if there are any & characters then that is the data that the server wants to send you. For example, a server could send a string containing html or a URL, and you would receiver that string with & characters and all.