Javascript 在 Node.js 中响应 JSON 对象（将对象/数组转换为 JSON 字符串）
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Responding with a JSON object in Node.js (converting object/array to JSON string)
提问by climboid
I'm a newb to back-end code and I'm trying to create a function that will respond to me a JSON string. I currently have this from an example
我是后端代码的新手，我正在尝试创建一个函数来响应我的 JSON 字符串。我目前从一个例子中得到这个
function random(response) {
console.log("Request handler 'random was called.");
response.writeHead(200, {"Content-Type": "text/html"});
response.write("random numbers that should come in the form of json");
response.end();
}
This basically just prints the string "random numbers that should come in the form of JSON". What I want this to do is respond with a JSON string of whatever numbers. Do I need to put a different content-type? should this function pass that value to another one say on the client side?
这基本上只是打印字符串“应该以 JSON 形式出现的随机数”。我想要做的是用任何数字的 JSON 字符串响应。我需要放置不同的内容类型吗？这个函数应该将该值传递给另一个在客户端说的吗？
Thanks for your help!
谢谢你的帮助！
回答by Kevin Reilly
Using res.jsonwith Express:
在 Express 中使用res.json：
function random(response) {
console.log("response.json sets the appropriate header and performs JSON.stringify");
response.json({
anObject: { item1: "item1val", item2: "item2val" },
anArray: ["item1", "item2"],
another: "item"
});
}
Alternatively:
或者：
function random(response) {
console.log("Request handler random was called.");
response.writeHead(200, {"Content-Type": "application/json"});
var otherArray = ["item1", "item2"];
var otherObject = { item1: "item1val", item2: "item2val" };
var json = JSON.stringify({
anObject: otherObject,
anArray: otherArray,
another: "item"
});
response.end(json);
}
回答by druveen
var objToJson = { };
objToJson.response = response;
response.write(JSON.stringify(objToJson));
If you alert(JSON.stringify(objToJson))you will get {"response":"value"}
如果alert(JSON.stringify(objToJson))你会得到{"response":"value"}
回答by tyronegcarter
You have to use the JSON.stringify()function included with the V8 engine that node uses.
您必须使用JSON.stringify()node 使用的 V8 引擎附带的功能。
var objToJson = { ... };
response.write(JSON.stringify(objToJson));
Edit:As far as I know, IANAhas officially registered a MIME type for JSON as application/jsonin RFC4627. It is also is listed in the Internet Media Typelist here.
编辑：据我所知，IANA已经正式注册的MIME类型JSON作为application/json在RFC4627。它也列在此处的Internet 媒体类型列表中。
回答by Greg
回答by Amir Arad
in express there may be application-scoped JSON formatters.
在 express 中可能有应用程序范围的 JSON 格式化程序。
after looking at express\lib\response.js, I'm using this routine:
查看 express\lib\response.js 后，我正在使用此例程：
function writeJsonPToRes(app, req, res, obj) {
var replacer = app.get('json replacer');
var spaces = app.get('json spaces');
res.set('Content-Type', 'application/json');
var partOfResponse = JSON.stringify(obj, replacer, spaces)
.replace(/\u2028/g, '\u2028')
.replace(/\u2029/g, '\u2029');
var callback = req.query[app.get('jsonp callback name')];
if (callback) {
if (Array.isArray(callback)) callback = callback[0];
res.set('Content-Type', 'text/javascript');
var cb = callback.replace(/[^\[\]\w$.]/g, '');
partOfResponse = 'typeof ' + cb + ' === \'function\' && ' + cb + '(' + partOfResponse + ');\n';
}
res.write(partOfResponse);
}
