Javascript：JSON.stringify无法正常工作

Question

I'm pulling JSON data from Wikipedia. However, I can't get it to stringify neatly and I don't understand why.

Here's my code.

request({url:formQuery(query), encoding:"utf8"}, (err, res, body) => {
    if (err) handleErr(err)
    console.log(JSON.stringify(body, null, 3))
})

If I just use plain console.log(body), the JSON outputs like this:

{"continue":{"rvcontinue":"20160314150329|710029514","continue":"||"},"query":{"normalized":[{ ...

But if I use stringify (as above), it looks like this:

"{\"continue\":{\"rvcontinue\":\"20160314150329|710029514\",\"continue\":\"||\"},\"query\":{\"normalized\":[{ ...

Stringify is adding a quote to the beginning of the string and escaping subsequent ones.

Why is this happening? Any help would be welcome.

Answer 1

Your JSON data is fine, the function add's slashes to the output because there are quotes in the input. The quotes around property names doesn't have to to be escaped to avoid conflicts when parsing the JSON string/output

Answer 2

I needed to parse the body string into a JSON object first. If I parse the body string, it works.

This works fine:

request({url:formQuery(query), encoding:"utf8"}, (err, res, body) => {
    if (err) handleErr(err)
    let json = JSON.parse(body);
    console.log(JSON.stringify(json, null, 3))

})

Answer 3

Without using stringify , you can use as below.

var oResultData = {"continue":{"rvcontinue":"1111","continue":"1111111"}};
var myRvcontinue = oResultData.continue.rvcontinue;
console.log(myRvcontinue); // 1111

Answer 4

This is because the result of your request is already a string representing your object. If you stringify it again (as you do), you obtain a string representing a string representing your object.