使用 Node.js 中的 JSON 对象进行响应(将对象/数组转换为 JSON 字符串)

我是一个后端代码的新手，我正在尝试创建一个函数来响应我的 JSON 字符串。我现在有一个例子

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();
}

这基本上只是打印字符串“应该以 JSON 形式出现的随机数”。我希望这样做的目的是响应一个 JSON 字符串，该字符串包含任何数字。我需要放置不同的内容类型吗？这个函数是否应该将该值传递给客户端的另一个函数？

谢谢你的帮助！

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小开

You have to use the JSON.stringify() function included with the V8 engine that node uses.

var objToJson = { ... };
response.write(JSON.stringify(objToJson));

Edit: As far as I know, IANA has officially registered a MIME type for JSON as application/json in RFC4627. It is also is listed in the Internet Media Type list here.

小开 
var objToJson = { };
objToJson.response = response;
response.write(JSON.stringify(objToJson));

If you alert(JSON.stringify(objToJson)) you will get {"response":"value"}

小开
最佳答案

Using res.json with Express:

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:

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);
}
小开

in express there may be application-scoped JSON formatters.

after looking at express\lib\response.js, I'm using this routine:

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);
}
小开

Per JamieL's answer to another post:

Since Express.js 3x the response object has a json() method which sets all the headers correctly for you.

Example:

res.json({"foo": "bar"});
小开 
const http = require('http');
const url = require('url');


http.createServer((req,res)=>{


const parseObj =  url.parse(req.url,true);
const users = [{id:1,name:'soura'},{id:2,name:'soumya'}]


if(parseObj.pathname == '/user-details' && req.method == "GET") {
let Id = parseObj.query.id;
let user_details = {};
users.forEach((data,index)=>{
if(data.id == Id){
user_details = data;
}
})
res.writeHead(200,{'x-auth-token':'Auth Token'})
res.write(JSON.stringify(user_details)) // Json to String Convert
res.end();
}
}).listen(8000);

I have used the above code in my existing project.

小开

The JSON.stringify() method converts a JavaScript object or value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.

response.write(JSON.stringify({ x: 5, y: 6 }));

know more


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