How to decode encode string in nodejs - node.js

I am receiving below encoded string
"{\"type\":\"recipe\",\"id\":\"1624955566083\",\"entity\":\"loves\",\"count\":1}"
when i am doing like following it gives me undefined for each value. How can i generate JSON object from encoded string ?
const { type, id, entity, count } = JSON.parse(req.body);
console.log(type, id, entity); // All the values are undefined


I have to do JSON.parse(JSON.parse(req.body)) to make it work.

Related

Google Apps Script: How to retrieve values from deeply nested object having nulls and empty elements?

Trying to retrieve {raw} values from all {type} keys in the object of this URL. #Tanaike made this code which worked well when all of {type} keys have clean data without any missing or null. But it didn't work when some of {type} keys have null elements or are empty, getting an error:
TypeError: Cannot read properties of null (reading 'reportedValue')
In #Tanaike's code below, I like to achieve something like if {type} key doesn't have {raw} value, array = [[type, ''], ....], and remove any elements of null. What should be changed in this line? Thank you!
var array = obj.timeseries.result.map(o => types.flatMap(type => o[type] ? [type, ...o[type].map(({ reportedValue: { raw } }) => raw)] : []));
function test() {
var url = 'https://query2.finance.yahoo.com/ws/fundamentals-timeseries/v1/finance/timeseries/CRWD?lang=en-US&region=US&symbol=CRWD&padTimeSeries=true&type=annualTaxProvision,trailingTaxProvision,annualPretaxIncome,trailingPretaxIncome,annualInterestExpenseNonOperating,trailingInterestExpenseNonOperating,annualLongTermDebt,quarterlyLongTermDebt,annualCurrentDebt,quarterlyCurrentDebt,annualCashCashEquivalentsAndShortTermInvestments,quarterlyCashCashEquivalentsAndShortTermInvestments,annualFreeCashFlow,trailingFreeCashFlow&merge=false&period1=493590046&period2=1672980169&corsDomain=finance.yahoo.com'
var obj = UrlFetchApp.fetch(url, { muteHttpExceptions: true }).getContentText();
obj = JSON.parse(obj); //Convert strings to object
var types = obj.timeseries.result.flatMap(({ meta: { type } }) => type);
var array = obj.timeseries.result.map(o => types.flatMap(type => o[type] ? [type, ...o[type].map(({ reportedValue: { raw } }) => raw)] : []));
array = Object.keys(array).map(k => [...array[k]]); // Convert object to array
console.log(array)
}

Looks like there's two different errors that could occur. One for a series missing all of its values and one where the series has null entries.
// A pull of the data at asker's url
var obj = '{"timeseries":{"result":[{"meta":{"symbol":["CRWD"],"type":["annualLongTermDebt"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"annualLongTermDebt":[null,null,{"dataId":23123,"asOfDate":"2021-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":7.38029E8,"fmt":"738.03M"}},null,{"dataId":23123,"asOfDate":"2022-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":7.39517E8,"fmt":"739.52M"}},null,null,null]},{"meta":{"symbol":["CRWD"],"type":["trailingFreeCashFlow"]},"timestamp":[1667174400],"trailingFreeCashFlow":[{"dataId":26185,"asOfDate":"2022-10-31","periodType":"TTM","currencyCode":"USD","reportedValue":{"raw":5.93996E8,"fmt":"594.00M"}}]},{"meta":{"symbol":["CRWD"],"type":["trailingInterestExpenseNonOperating"]},"timestamp":[1667174400],"trailingInterestExpenseNonOperating":[{"dataId":20064,"asOfDate":"2022-10-31","periodType":"TTM","currencyCode":"USD","reportedValue":{"raw":2.5269E7,"fmt":"25.27M"}}]},{"meta":{"symbol":["CRWD"],"type":["annualFreeCashFlow"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"annualFreeCashFlow":[{"dataId":26185,"asOfDate":"2019-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":-6.5613E7,"fmt":"-65.61M"}},{"dataId":26185,"asOfDate":"2020-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1.2456E7,"fmt":"12.46M"}},{"dataId":26185,"asOfDate":"2021-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":2.92723E8,"fmt":"292.72M"}},null,{"dataId":26185,"asOfDate":"2022-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":4.41095E8,"fmt":"441.10M"}},null,null,null]},{"meta":{"symbol":["CRWD"],"type":["trailingTaxProvision"]},"timestamp":[1667174400],"trailingTaxProvision":[{"dataId":20145,"asOfDate":"2022-10-31","periodType":"TTM","currencyCode":"USD","reportedValue":{"raw":3.067E7,"fmt":"30.67M"}}]},{"meta":{"symbol":["CRWD"],"type":["trailingPretaxIncome"]},"timestamp":[1667174400],"trailingPretaxIncome":[{"dataId":20136,"asOfDate":"2022-10-31","periodType":"TTM","currencyCode":"USD","reportedValue":{"raw":-1.44422E8,"fmt":"-144.42M"}}]},{"meta":{"symbol":["CRWD"],"type":["annualTaxProvision"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"annualTaxProvision":[{"dataId":20145,"asOfDate":"2019-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1367000.0,"fmt":"1.37M"}},{"dataId":20145,"asOfDate":"2020-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1997000.0,"fmt":"2.00M"}},{"dataId":20145,"asOfDate":"2021-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":4760000.0,"fmt":"4.76M"}},null,{"dataId":20145,"asOfDate":"2022-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":7.2355E7,"fmt":"72.36M"}},null,null,null]},{"meta":{"symbol":["CRWD"],"type":["annualPretaxIncome"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"annualPretaxIncome":[{"dataId":20136,"asOfDate":"2019-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":-1.3871E8,"fmt":"-138.71M"}},{"dataId":20136,"asOfDate":"2020-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":-1.39782E8,"fmt":"-139.78M"}},{"dataId":20136,"asOfDate":"2021-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":-8.7869E7,"fmt":"-87.87M"}},null,{"dataId":20136,"asOfDate":"2022-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":-1.60023E8,"fmt":"-160.02M"}},null,null,null]},{"meta":{"symbol":["CRWD"],"type":["quarterlyCashCashEquivalentsAndShortTermInvestments"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"quarterlyCashCashEquivalentsAndShortTermInvestments":[null,null,null,{"dataId":23033,"asOfDate":"2021-10-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":1.907508E9,"fmt":"1.91B"}},{"dataId":23033,"asOfDate":"2022-01-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":1.996633E9,"fmt":"2.00B"}},{"dataId":23033,"asOfDate":"2022-04-30","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":2.152736E9,"fmt":"2.15B"}},{"dataId":23033,"asOfDate":"2022-07-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":2.318858E9,"fmt":"2.32B"}},{"dataId":23033,"asOfDate":"2022-10-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":2.466551E9,"fmt":"2.47B"}}]},{"meta":{"symbol":["CRWD"],"type":["annualCashCashEquivalentsAndShortTermInvestments"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"annualCashCashEquivalentsAndShortTermInvestments":[{"dataId":23033,"asOfDate":"2019-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1.91655E8,"fmt":"191.66M"}},{"dataId":23033,"asOfDate":"2020-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":9.12064E8,"fmt":"912.06M"}},{"dataId":23033,"asOfDate":"2021-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1.918608E9,"fmt":"1.92B"}},null,{"dataId":23033,"asOfDate":"2022-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1.996633E9,"fmt":"2.00B"}},null,null,null]},{"meta":{"symbol":["CRWD"],"type":["quarterlyLongTermDebt"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"quarterlyLongTermDebt":[null,null,null,{"dataId":23123,"asOfDate":"2021-10-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":7.39145E8,"fmt":"739.14M"}},{"dataId":23123,"asOfDate":"2022-01-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":7.39517E8,"fmt":"739.52M"}},{"dataId":23123,"asOfDate":"2022-04-30","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":7.39889E8,"fmt":"739.89M"}},{"dataId":23123,"asOfDate":"2022-07-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":7.40261E8,"fmt":"740.26M"}},{"dataId":23123,"asOfDate":"2022-10-31","periodType":"3M","currencyCode":"USD","reportedValue":{"raw":7.40633E8,"fmt":"740.63M"}}]},{"meta":{"symbol":["CRWD"],"type":["annualInterestExpenseNonOperating"]},"timestamp":[1548892800,1580428800,1612051200,1635638400,1643587200,1651276800,1659225600,1667174400],"annualInterestExpenseNonOperating":[{"dataId":20064,"asOfDate":"2019-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":428000.0,"fmt":"428.00k"}},{"dataId":20064,"asOfDate":"2020-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":442000.0,"fmt":"442.00k"}},{"dataId":20064,"asOfDate":"2021-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":1559000.0,"fmt":"1.56M"}},null,{"dataId":20064,"asOfDate":"2022-01-31","periodType":"12M","currencyCode":"USD","reportedValue":{"raw":2.5231E7,"fmt":"25.23M"}},null,null,null]},{"meta":{"symbol":["CRWD"],"type":["quarterlyCurrentDebt"]}},{"meta":{"symbol":["CRWD"],"type":["annualCurrentDebt"]}}],"error":null}}'
obj = JSON.parse(obj); //Convert strings to object
// for each object in `obj.timeseries.result`, `.meta.type` names a key in
// that object that contains the data array. That key may not exist. Some
// entries in the data array may be null.
var mangled = obj.timeseries.result.map(o => {
// pull the key
const type = o.meta.type[0];
// if there's no attribute of that name, return an empty array of values
if (!(type in o)) return [type, []];
// otherwise return an array of values, being careful of `null`s
return [
type,
o[type].map(value => value == null ? null : value.reportedValue.raw),
];
});
console.log(mangled)

how to convert a JSON data into map in Flutter?

my JSON data is like this:
{
notification:{
title: flutter fcm,
body: i got a firebase notification
},
data:{
myKey: myValue
}
}
how should I convert it into a map??
This is the value printed on onMessage() callback of firebase push notification. It is printing on my console. I want to convert this to map. This JSON data's runtimeType is String.

We can use the dart:convert package and the json.decode method to convert a JSON String to a Map:
import 'dart:convert';
final Map<String, dynamic> jsonData = json.decode(jsonData);

Stringifying JSON data loses object I'm trying to stringify

I'm new to NodeJS and I'm trying to learn it a bit better by writing a Discord bot. But I'm having an issue with stringifying an object to JSON. I think it's having an issue with the array I'm setting, but I'm not sure how else I would do this. If I'm not supposed to set an array and using my guildMembers example below, how else should I insert this data into my JSON file?
I've looked through a few examples here on StackOverflow and found this particular article: JSON Stringify Removing Data From Object. However, it's not clear to me given what I'm trying to achieve.
var o = {};
var guildKey = guild.id;
o[guildKey] = [];
o[guildKey]['guildMembers'] = {};
var guildMembers = []
guild.members.forEach(function(guildMember, guildMemberId) {
if (!guildMember.user.bot){
var memberData = {
id: guildMember.id,
data: {
userName: guildMember.user.username,
nickName: guildMember.nickname,
displayName: guildMember.displayName,
joinedAt: guildMember.joinedAt
}
}
guildMembers.push(memberData);
};
});
o[guildKey]['guildMembers'] = guildMembers;
json = JSON.stringify(o);
I am expecting the data to show the guildMembers object with the array under the guildKey object. However, the JSON shows only the guildKey object with an empty array:
{"guildKey":[]}

You make guildKey an array and then try to use it as an object ...
Solution is:
o[guildKey] = {};
Just like in the mentioned post.

It is because you are assigning a key-value pair to an array with
o[guildKey]['guildMembers'] = { }; <= o[guildKey]
When iterating over an array to display the contents, JavaScript does not access non-integer keys. You should store o[guildKey] as an object instead.

Multiple types in query string in nodejs

I am creating a get api in nodejs.I am requesting the following url
http://localhost:8080/api?id=20&condition1=true&arr=[{prop1:1}]&obj={a:1,b:2}
And I am getting the request query object as follows-
req.query = {
arr:"[{prop1:1}]",
condition1:"true",
id:"20",
obj:"{a:1,b:2}"
}
I want to convert the query object keys to appropriate types.My query object should be converted to
req.query = {
arr:[{prop1:1}], // Array
condition1:true, // Boolean
id:20, // Number
obj: {a:1,b:2} //Object
}
req.query object is dynamic, it can contain any number of objects, array, boolean , number or strings. Is there any way to do it?

This functionality doesn't come out of the box with express and query parameters.
The problem is that in order for the query string parser to know if "true" is actual boolean true or the string "true" it needs some sort of Schema for the query object to help parsing the string.
Option A
What I can recommend is using Joi.
In your case it will look like :
const Joi = require( "joi" );
const querySchema = {
arr: Joi.array(),
condition1: Joi.boolean(),
id: Joi.number(),
obj: {
a: Joi.number(),
b: Joi.number()
}
}
Having this schema you can attach it to your express method and use Joi.validate To validate it.
function getFoo( req, res, next ) {
const query = req.query; // query is { condition1: "true" // string, ... }
Joi.validate( query, querySchema, ( err, values ) => {
values.condition1 === true // converted to boolean
} );
}
Option B
Another way of having properly typed GET requests would be to trick the query parameters and just provide a stringified JSON.
GET localhost/foo?data='{"foo":true,"bar":1}'
This will give you the possibility to just parse the request query
function getFoo( req, res, next ) {
const data = JSON.parse( req.query.data )
data.foo // boolean
data.bar // number
}

req.params.number is string in expressjs?

I am writing expressjs app. is req.params.anything always string and not number
suppose if I pass a number for user_id it's typeof is always string.
app.get('user/:user_id', function(req, res){
console.log(typeof req.params.user_id);
});
GET user/21
this logs string.
So is it always type string for req.params.x?

Yes, all params will be strings.
This is extracted from the expressjs route.js:
var val = 'string' == typeof m[i]
? decodeURIComponent(m[i])
: m[i];
So the val will always be a string, since the result of decodeURIComponent is always a string, while m is the result of a RegExp.exec() which returns an array of matched strings, so it's also safe to assume that m[i] will be a string.

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