Do I implement Serialize and Deserialize?
- Js Serialize Function
- Node Js Php Serialize Examples
- Cool Node Js Examples
- Node Js Php Serialize Example Python
RedisStore is setup as my session store with Express. Does this mean that I DO NOT implement Serialize and Deserialize? Will it happen automatically?
How to Use serialize and unserialize in PHP. In PHP, there is no possibility of transporting or storing data. For executing a complex set of data continuously, the serialize and unserialize functions come in rescue. They are especially handy for dealing with complex data. (Node.js) JWE Using Flattened JWE JSON Serialization. This example duplicates the example A.5 in RFC 7516 for JSON Web Encryption (JWE). This example demonstrates using the flattened JWE JSON Serialization syntax. This example demonstrates the capability for encrypting the plaintext to a single recipient in a flattened JSON structure.
- Definition and Usage. The serialize function converts a storable representation of a value. To serialize data means to convert a value to a sequence of bits, so that it can be stored in a file, a memory buffer, or transmitted across a network.
- (Node.js) JWE Using General JWE JSON Serialization. This example duplicates the example A.4 in RFC 7516 for JSON Web Encryption (JWE). This example demonstrates the capability for encrypting the same plaintext to multiple recipients. Two recipients are present in this example. Note: This example requires Chilkat v9.5.0.66 or greater.
- Definition and Usage. The serialize function converts a storable representation of a value. To serialize data means to convert a value to a sequence of bits, so that it can be stored in a file, a memory buffer, or transmitted across a network.
When I don’t implement these methods I get the following Express error – 500 Error: failed to serialize user into session. When I do implement them I’m not sure what to put in the Deserialize.
The code below appears to work but the sessions are not persisting. I need to login everytime I visit the site.
Is there a good example anywhere of NodeJS + Passport + RedisStore?
Answers:
If you are using sessions you have to provide passport with a serialize and deserialize function. Implementing Redis as a session store has nothing to do with how passport was implement, it only deals with where the session data is stored.
Implementing Sessions with passport
As I said, the serialize and deserialize functions must be provided to passport for sessions to work.
The purpose of the serialize function is to return sufficient identifying information to recover the user account on any subsequent requests. Specifically the the second parameter of the
done()
method is the information serialized into the session data.The deserialize function that you provide is intended to return the user profile based on the identifying information that was serialized to the session.
Here is the example from the Passport Guide in the section discussing sessions:
In the above example
passport.serializeUser()
is provided a function that takes two parameters, the user profile (user
) and a callback function (done
). The callback function takes as it’s second parameter the identifying information (user.id
, but if you’re using mongoDB this may be user._id
) required to recover the account from the database. This will be called on every authenticated request and stores the identifying information in the session data (whether that is in a cookie or your Redis store).passport.deserializeUser()
is provided a function that also takes two parameters, the identifying information (id
) and again a callback function (done
). The identifying information is what was serialized to the session data in the previous request (user.id
). The callback function here requires the user profile as it’s second parameter, or any error in raised in retrieving the profile as it’s first parameter. The User.findById()
function is a lookup function for the user profile in the database. In this example User
object is an instance of a mongoose model which has the findById()
function.The function provided to
passport.deserializeUser()
is called by the passport middleware, passport.session()
prior to the route handling to store the user profile (user
) to req.user
.Implementing Redis as a Session Store
The purpose of using Redis is to store session data server side so the only data stored client side is the session id. Again, this is independant of how you have implemented passport, passport doesn’t care where the session data is being stored as long as you have added session support to your app. This previos question on stackoverflow addresses how to implement Redis
Answers:
Bit late but i have made this visual thing to understand
- When and how is is an strategy/local/Facebook/etc called and how it gets to req.login or passport.serializeUser() and whats with done()?
passport.authenticate()
invokes the respective strategy you provide as an argument, there you match req.body.password
and req.body.username
with the database stored or in memory stored password and username. if user found you pass it to done()
as second argument else you return false
The done callback return back to
passport.authenticate()
. if done is called previously with user (ie done(null,user);
) than req,logIn()
is called automatically or by user behind the scenereq.logIn()
calls passport.serializeUser()
- Whats passport.serializeUser and Where does user.some_key go after this function has been called?
the key of user object you provide in second argument of the done in serialize function is saved in session and is used to retrieve the whole object via deserialize function.
Serialize function determine what data from the user object should be stored in the session. The result of the serializeUser method is attached to the session as
req.session.passport.user = {}
here for instance it would be(as we provide id as key) req.session.passport.user = {id:'xyz'}
- What is passport.deserializeUser and where does it fit in the workflow?
In deserialize function you provide in first argument of deserialize function that same key of user object that was given to done function in serialize call. so your whole object is retrieved with help of that key. that key here is id(key can be any key of the user object ie name,email etc)
In deSerialize function that key is matched with in memory array / database or any data resource
In deSerialize function that key is matched with in memory array / database or any data resource
The fetched object is attached to request object as
req.user
id
key can be any key of the user object ie name,email
etcJs Serialize Function
Visual Flow
here
id
key can be any key of the user object ie name,email
etcAnswers:
Given the following configuration of
express-session
with connect-redis
as the session store (using Express 4):You can just tell passport to serialize the entire user object, instead of just the user id.
The entire user object will be saved with the session in Redis, and placed on the request as
req.user
for every request.PHP is a server-side scripting language for creating your website’s backend system that can serve webpages, communicate with databases, and exchange data over the internet. A decent backend framework like PHP needs to be capable of providing and processing data in any format (e.g., XML, JSON, etc.) to be socially accepted in a society of skilled web development frameworks.
Since JSON is a ubiquitous data format for sharing and storing data, it is vital that a PHP backend allows processing of JSON data. This is where json_encode (and json_decode) come into the picture and enable PHP processed data to be compatible with frameworks and systems that deal with JSON data and make way for easier and faster web development.
In this post, we’ll learn about the JSON format, about the json_encode() function - what it is, why it is required, and how it can be used to convert PHP data structures into JSON format, all with examples. In the end, we’ll also see how we can decode JSON data to be able to process it. Let’s get started!
Use these links to navigate the guide:
What is the JSON_Encode Function?
What is JSON?
JSON (JavaScript Object Notation) is one of the most popular open-standard file formats used for storing and sharing data. It uses human-readable text to represent data using attribute-value pairs and array data types.
This is what a common JSON object looks like -
We’ll be using this example in the sections below to understand how we can encode PHP data into JSON format.
Donkey Kong Country Returns (Dolphin) (W/ Download Link .... JSON allows us to represent and encapsulate complex data in an organized fashion that can be shared easily across the internet. Even though JSON derives its name from JavaScript, JSON was created to be used by all programming languages.
Let’s see how we can convert our PHP variables into JSON format.
JSON_Encode - PHP variables to JSON
json_encode() is a native PHP function that allows you to convert PHP data into the JSON format.
The function takes in a PHP object ($value) and returns a JSON string (or False if the operation fails). Don’t worry about the $options and $depth parameters; you’re seldom going to need them.
Let’s look at a simple example -
OUTPUT:
Why encode to JSON?
Node Js Php Serialize Examples
As we saw above, JSON is one of the most common formats for exchanging data over the internet. Therefore, it can be imperative in some cases for PHP servers to provide JSON-encoded data and to be able to process it.
Let’s see how we can encode various PHP data structures into JSON using json_encode().
Convert PHP Strings to JSON
![Serialize Serialize](/uploads/1/1/8/8/118885430/368638555.png)
JSON encoding for a string is the string itself. Therefore, encoding a PHP string into JSON is quite simple; it results in the same string being returned.
Let’s see this using an example -
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PHP String to JSON Example
OUTPUT:
Convert PHP Objects to JSON
Since the information in JSON is stored in key/value pairs, json_encode() is more likely to be used to encode PHP objects and their instance variables.
PHP Object to JSON Example
Let’s understand how we can JSON-encode a PHP object by creating an instance of a Book class based on the Library example we saw above (Sec 1.1). We’ll create two instance variables for the book’s instance and encode the object using json_encode().
OUTPUT:
Convert PHP Array to JSON
There are three types of arrays in PHP, namely - Indexed arrays, Associative arrays, and Multidimensional arrays. Let us look at what these are and some examples of how we can encode each of these into JSON -
Indexed Array to JSON
Indexed arrays are conventional arrays that are represented by index numbers.
Example:
$arr = array(1,2,3,4); // [1,2,3,4]
Converting them to JSON is quite easy -
OUTPUT:
Associative Array to JSON
Associative arrays are arrays that use named keys as indices for your values.
Example:
$age = array('John'=>'11', 'Ken'=>'19', 'Tim'=>'14');
We can also arrive at the book JSON object that we saw above by encoding an Associative array as such -
OUTPUT:
Notice how an Indexed array is represented by an array in JSON, whereas Associative arrays take the form of a complete JSON object after being encoded.
Multidimensional Array to JSON
Multidimensional arrays can be created by nesting arrays into each other as such-
We can create a Multidimensional array to store a list of books for our library example. Let’s create one and encode that into JSON.
OUTPUT:
Putting it all together
Now that we have seen how json_encode() is used in different contexts, for encoding different PHP data types, let’s put all of our learnings together to create JSON data for the Library example we saw above.
Cool Node Js Examples
OUTPUT:
Well, that was fun! Now before we wrap up, I think it’s worthwhile to see how we can convert JSON data back to PHP variables.
JSON_Decode - JSON to PHP variables
In the very likely case of your JavaScript front-end sending JSON-based data back to your PHP server, you would need a way to decode the JSON data in a way that can be processed by PHP.
We can use PHP’s json_decode() function for the same, which takes in a JSON encoded string and returns the corresponding PHP variable.
Node Js Php Serialize Example Python
json_decode ( string $json [, bool $assoc = FALSE [, int $depth = 512 [, int $options = 0 ]]] ) : mixed
$assoc parameter (False by default) is used to specify whether you need the function to return an Associative array or a standard class Object.
JSON_Decode example
Let’s try to retrieve the book object that we encoded into JSON above by decoding it using php_decode().
OUTPUT:
Note how by default a stdClass object is returned. For decoding it as an Associative array, set the $assoc parameter to True as such -
$book = json_decode($book_json, True);
This will result in an Associative array being returned.
OUTPUT:
Try the JSON_Encode Function for Yourself
In this post, we read about the JSON (JavaScript Object Notation) format, why it is essential, and how we can convert different PHP variables into JSON using json_encode(). We also saw how we could use json_decode() to decode JSON data into PHP variables. With this understanding of processing JSON data using PHP, go ahead and encode your PHP objects into JSON and share them across the internet. All of this while staying at home. Stay healthy, stay safe!
Happy coding!
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