Develop Reference

How do you truncate a String to a max number of bytes in Google Apps Script?

I am parsing a JSON object obtained by URLFetchApp.fetch() and need to truncate a string value to a max number of bytes. It seems like some combination of the Google Apps Script Utilities Class and HTTPResponse Class is where I will find the answer, but I can not figure out which methods to use and how to put them together.
{object: {key: 'string'}}
something like:
object.key.string.toBytes().substringAsBytes(0,maxBytes).backToString()
https://developers.google.com/apps-script/reference/utilities
https://developers.google.com/apps-script/reference/url-fetch/http-response

Use with Array.splice:
const str = { obj: { key: 'string' } }.obj.key,
maxBytes = 10,
byteData = Utilities.newBlob(str).getBytes();
byteData.splice(maxBytes);
const truncatedStr = Utilities.newBlob(byteData).getDataAsString();

Convert string with '=' to JSON format

I am trying to convert a string i receive back from an API into a JSON object in Angular.
The issue is that the string is not normalized to be parsed into JSON easily.
This is the string im working with:
"{rootCause=EJBusinessException: This is a sample exception thrown for testing additional info field, description=This is a more detailed description about the incident., stackTrace=com.springboot.streams.infrastructure.web.heartbeat.HeartbeatService.testServiceNow(HeartbeatService.java:200)}"
When trying to do JSON.parse(myStr) it throws an error due to invalid string format.
Is there an easy way to convert the listed string into a more correct JSON format, getting rid of the '=' and replacing them with ':' instead.
There is more to it than just .replace(/['"]+/g, ''), as even with that the string is not ready to be turned into JSON yet.
Hoping someone more versed in Javascript knows a trick i dont.

You just need to manipulate the string before parsing it remove unecessary string that can cause error to the object like "{" and "}" and split it by "," example is in below.
var obj = {}, str = "{rootCause=EJBusinessException: This is a sample exception thrown for testing additional info field, description=This is a more detailed description about the incident., stackTrace=com.springboot.streams.infrastructure.web.heartbeat.HeartbeatService.testServiceNow(HeartbeatService.java:200)}"
str.split(",").forEach((st, i) => {
pair = st.split("=")
if(pair.length > 1) {
obj[pair[0].replace("{",'').replace("}", '').trim()] = pair[1]
} else {
obj[i] = pair
}
})
console.log(obj)

As commenters have posted, unless you control the API or at least have documentation that output will always follow a specific format, then you are limited in what you can do. With your current example, however you can trim off the extraneous bits to get the actual data... (remove braces, split on comma, split on equals) to get your key:value pairs... then build a javascript object from scratch with the data... if you need json string at that point can just JSON.stringify()
var initialString = "{rootCause=EJBusinessException: This is a sample exception thrown for testing additional info field, description=This is a more detailed description about the incident., stackTrace=com.springboot.streams.infrastructure.web.heartbeat.HeartbeatService.testServiceNow(HeartbeatService.java:200)}"
var trimmedString = initialString.substr(1, initialString.length - 2);
var pairArray = trimmedString.split(',');
var objArray = [];
pairArray.forEach(pair => {
var elementArray = pair.split('=');
var obj = {
key: elementArray[0].trim(),
value: elementArray[1].trim()
};
objArray.push(obj);
});
var returnObj = {};
objArray.forEach(element => {
returnObj[element.key] = element.value;
});
console.log(JSON.stringify(returnObj));

In the javascript unable to convert string to variable

One of my requirement in the javascript, I am trying to convert the string which is passing from the database to javascript object.
Step1:
String passing from the databse:
"validator":["required","numeric","maxLength:14","{type: amountValidate}"]
Step2: Converting to javascript object using JSON.Parse() method, output as follows:
validator: Array(4)
0: "required"
1: "numeric"
2: "maxLength:14"
3: "{type: amountValidate}"
length: 4
Expected output is:
In the below code amountValidate is converting into the function by tabulator js api.
validator:["required","numeric","maxLength:14",{
type:amountValidate,
}]
Since I am applying the below function to the type:amountValidate, it should behave as a variable and it should not be in the double quotes.
var amountValidate = function(cell, value, parameters){
var regex = /^\s*-?(\d+(\.\d{1,2})?|\.\d{1,2})\s*$/
var n = value.match(regex);
if(n !== null){
return true;
}else{
return false;
}
}
Thanks in advance.

The main problem here is that your string is not a valid JSON. Should be something like:
'{"validator": ["required","numeric","maxLength:14", {"type": "amountValidate"}]}'
There are multiple json formatters/validators online, like this one, that you could use to check it.

Parsing a JSON sub string

I have javascript function that calls an external Api and returns in most case a valid JSON string.
function (successResponse) {
{
console.log(successResponse);
}
However, in some cases it return the the following invalid JSON
Response: Status=200, Text: {"createdTime":"2017-05-08T14:47:56Z","lastUpdatedTime":"2017-05-08T14:47:56Z","createdMode":"API","uuid":"e333c1-3599-36d7-9ef5-dc22c79a4a52","userId":"anonymous"}, Error Message: null
How can I parse the above string to get the 'uuid'
Thanks

If you're expecting a response string in that format, you can use a regular expression to extract the "text" portion of the response:
function (successResponse) {
{
var responseText = successResponse.match(/\{.+\}/);
var responseTextJSON = JSON.parse(responseText);
var uuid = responseTextJSON.uuid;
console.log(uuid);
}

Maybe you can parse the string yourself to exclude everything outside of {} ?
var apiResponse = 'Response: Status=200, Text: {"createdTime":"2017-05-08T14:47:56Z","lastUpdatedTime":"2017-05-08T14:47:56Z","createdMode":"API","uuid":"e333c1-3599-36d7-9ef5-dc22c79a4a52","userId":"anonymous"}, Error Message: null';
var apiResponse_fixed = apiResponse.substring((apiResponse.indexOf("{") - 1), (apiResponse.lastIndexOf("}") + 1));
var json_obj = JSON.parse(apiResponse_fixed);
console.log(json_obj.uuid);

Replace the non-JSON features, and then interpret as JSON
Looks like the server owner has been a bit lazy, and programmed an error response which contains a JSON-like interior section but surrounded by a couple of non-JSON elements.
If you are desperate to resolve the situation and have no ability to fix the server output format, here is my suggestion:
notQuiteJson = 'Response: Status=200, Text: {"createdTime":"2017-05-08T14:47:56Z","lastUpdatedTime":"2017-05-08T14:47:56Z","createdMode":"API","uuid":"e333c1-3599-36d7-9ef5-dc22c79a4a52","userId":"anonymous"}, Error Message: null';
madeJson = notQuiteJson.replace('Response: Status=200, Text:','{"Response": {"Status":200}, "Text":').replace('Error Message: null','"ErrorMessage": null}')
obj = JSON.parse(madeJson)
console.log(obj.Text.uuid) // Result: "e333c1-3599-36d7-9ef5-dc22c79a4a52"
Of course this only works if the error message is always exactly this. In reality you may want to use a 3-digit wildcard to cover a range of "Status=" codes. But then you would have to also be confident that all the error modes produce the same non-JSON text at the start and end of the response.
Disclaimer
#sp00m and #Bergi, don't kill me: you are right of course, but this is just for if the poster has no choice in the matter 8-)

Convert ObjectID (Mongodb) to String in JavaScript

I want to convert ObjectID (Mongodb) to String in JavaScript.
When I get a Object form MongoDB. it like as a object has: timestamp, second, inc, machine.
I can't convert to string.

Try this:
objectId.str
See the doc.
ObjectId() has the following attribute and methods:
[...]
str - Returns the hexadecimal string representation of the object.

in the shell
ObjectId("507f191e810c19729de860ea").str
in js using the native driver for node
objectId.toHexString()

Here is a working example of converting the ObjectId in to a string
> a=db.dfgfdgdfg.findOne()
{ "_id" : ObjectId("518cbb1389da79d3a25453f9"), "d" : 1 }
> a['_id']
ObjectId("518cbb1389da79d3a25453f9")
> a['_id'].toString // This line shows you what the prototype does
function () {
return "ObjectId(" + tojson(this.str) + ")";
}
> a['_id'].str // Access the property directly
518cbb1389da79d3a25453f9
> a['_id'].toString()
ObjectId("518cbb1389da79d3a25453f9") // Shows the object syntax in string form
> ""+a['_id']
518cbb1389da79d3a25453f9 // Gives the hex string
Did try various other functions like toHexString() with no success.

You can use $toString aggregation introduced in mongodb version 4.0 which converts the ObjectId to string
db.collection.aggregate([
{ "$project": {
"_id": { "$toString": "$your_objectId_field" }
}}
])

Use toString:
var stringId = objectId.toString()
Works with the latest Node MongoDB Native driver (v3.0+):
http://mongodb.github.io/node-mongodb-native/3.0/

Acturally, you can try this:
> a['_id']
ObjectId("518cbb1389da79d3a25453f9")
> a['_id'] + ''
"518cbb1389da79d3a25453f9"
ObjectId object + String will convert to String object.

If someone use in Meteorjs, can try:
In server: ObjectId(507f191e810c19729de860ea)._str.
In template: {{ collectionItem._id._str }}.

Assuming the OP wants to get the hexadecimal string value of the ObjectId, using Mongo 2.2 or above, the valueOf() method returns the representation of the object as a hexadecimal string. This is also achieved with the str property.
The link on anubiskong's post gives all the details, the danger here is to use a technique which has changed from older versions e.g. toString().

In Javascript, String() make it easy
const id = String(ObjectID)

this works, You have mongodb object: ObjectId(507f191e810c19729de860ea),
to get string value of _id, you just say
ObjectId(507f191e810c19729de860ea).valueOf();

In Js do simply: _id.toString()
For example:
const myMongoDbObjId = ObjectID('someId');
const strId = myMongoDbObjId.toString();
console.log(typeof strId); // string

You can use string formatting.
const stringId = `${objectId}`;

toString() method gives you hex String which is kind of ascii code but in base 16 number system.
Converts the id into a 24 character hex string for printing
For example in this system:
"a" -> 61
"b" -> 62
"c" -> 63
So if you pass "abc..." to get objectId you will get "616263...".
As a result if you want to get readable string(char string) from objectId you have to convert it(hexCode to char).
To do this I wrote an utility function hexStringToCharString()
function hexStringToCharString(hexString) {
const hexCodeArray = [];
for (let i = 0; i < hexString.length - 1; i += 2) {
hexCodeArray.push(hexString.slice(i, i + 2));
}
const decimalCodeArray = hexCodeArray.map((hex) => parseInt(hex, 16));
return String.fromCharCode(...decimalCodeArray);
}
and there is usage of the function
import { ObjectId } from "mongodb";
const myId = "user-0000001"; // must contains 12 character for "mongodb": 4.3.0
const myObjectId = new ObjectId(myId); // create ObjectId from string
console.log(myObjectId.toString()); // hex string >> 757365722d30303030303031
console.log(myObjectId.toHexString()); // hex string >> 757365722d30303030303031
const convertedFromToHexString = hexStringToCharString(
myObjectId.toHexString(),
);
const convertedFromToString = hexStringToCharString(myObjectId.toString());
console.log(`convertedFromToHexString:`, convertedFromToHexString);
//convertedFromToHexString: user-0000001
console.log(`convertedFromToString:`, convertedFromToString);
//convertedFromToHexString: user-0000001
And there is also TypeScript version of hexStringToCharString() function
function hexStringToCharString(hexString: string): string {
const hexCodeArray: string[] = [];
for (let i = 0; i < hexString.length - 1; i += 2) {
hexCodeArray.push(hexString.slice(i, i + 2));
}
const decimalCodeArray: number[] = hexCodeArray.map((hex) =>
parseInt(hex, 16),
);
return String.fromCharCode(...decimalCodeArray);
}

Just use this : _id.$oid
And you get the ObjectId string. This come with the object.

Found this really funny but it worked for me:
db.my_collection.find({}).forEach((elm)=>{
let value = new String(elm.USERid);//gets the string version of the ObjectId which in turn changes the datatype to a string.
let result = value.split("(")[1].split(")")[0].replace(/^"(.*)"$/, '$1');//this removes the objectid completely and the quote
delete elm["USERid"]
elm.USERid = result
db.my_collection.save(elm)
})

On aggregation use $addFields
$addFields: {
convertedZipCode: { $toString: "$zipcode" }
}

Documentation of v4 (right now it's latest version) MongoDB NodeJS Driver says: Method toHexString() of ObjectId returns the ObjectId id as a 24 character hex string representation.

In Mongoose, you can use toString() method on ObjectId to get a 24-character hexadecimal string.
Mongoose documentation

Below three methods can be used to get the string version of id.
(Here newUser is an object containing the data to be stored in the mongodb document)
newUser.save((err, result) => {
if (err) console.log(err)
else {
console.log(result._id.toString()) //Output - 23f89k46546546453bf91
console.log(String(result._id)) //Output - 23f89k46546546453bf91
console.log(result._id+"") //Output - 23f89k46546546453bf91
}
});

Use this simple trick, your-object.$id
I am getting an array of mongo Ids, here is what I did.
jquery:
...
success: function (res) {
console.log('without json res',res);
//without json res {"success":true,"message":" Record updated.","content":[{"$id":"58f47254b06b24004338ffba"},{"$id":"58f47254b06b24004338ffbb"}],"dbResponse":"ok"}
var obj = $.parseJSON(res);
if(obj.content !==null){
$.each(obj.content, function(i,v){
console.log('Id==>', v.$id);
});
}
...

You could use String
String(a['_id'])

If you're using Mongoose along with MongoDB, it has a built-in method for getting the string value of the ObjectID. I used it successfully to do an if statement that used === to compare strings.
From the documentation:
Mongoose assigns each of your schemas an id virtual getter by default which returns the document's _id field cast to a string, or in the case of ObjectIds, its hexString. If you don't want an id getter added to your schema, you may disable it by passing this option at schema construction time.