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
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?
Thanks for your help!
This question is related to
javascript
node.js
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"});
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.
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);
}
var objToJson = { };
objToJson.response = response;
response.write(JSON.stringify(objToJson));
If you alert(JSON.stringify(objToJson))
you will get {"response":"value"}
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.
Source: Stackoverflow.com