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I would like to serialize data from a JSON object and send it throught the network with kafka as an end. Now I have an avro schema in a file, that determinate the fields necessary to send to kafka for the logging system:

I am using a node packages 'avro-schema', I tried others but none of then are working well, I just need to serialize in an avro way from node js.

2 Answers

With avsc:

You can find more information on the various encoding methods available here.

Here is an example of what we are doing for a similar use case where we send Avro records to another queue (Amazon Kinesis), adapted to your schema. We are using it with node-avro-io 0.2.0 and stream-to-arry 2.0.2.

The examples for node-avro-io, at the time of writing, are for serializing/deserializing Avro files on the filesystem. This example uses the stream-to-array package as a shortcut to getting a Buffer out of the stream-based node-avro-io package. The Buffer can be sent to your queue as the message in your Kafka producer.

Some other node.js packages, such as avronode and Collective's node-avro, are wrappers for the C++ library. I did not have as much success with these packages. Here's a tl:dr for node-avro's Avro C++ library installation instructions (building a .deb package for it). It may help with any C++ wrapper package.

For Collective's node-avro, I had to remove the export CXXFLAGS='-fcxx-exceptions' line from the bin/install-and-run-tests script on Ubuntu 14.04.

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Node.js has emerged as a leading platform for creating fully scalable applications within least amount of time. Additionally, the platform undergoes constant upgrades so as to allow developers to continue delivering bespoke applications for their clients. Unlike in the case of XML, choosing JSON files for storing data is a convenient option. The reason being that the JSON files are less cluttered and easy-to-read. Collaborating JSON files with Node.js makes it simple to ensure that the information can be easily accessed by the users. Continue going through this post to learn the method of using JSON files in Node.js.

What is JSON?

Before proceeding ahead, let me brief you on what exactly is JSON (JavaScript Object Notation). Well, it is basically a lightweight data format which has become a web standard followed by a majority of web developers across the globe. JSON can either be represented as a hash of properties and values(for e.g. an Object) or as a list of values (for e.g. an Array).
Have a look at this:

Handling JSON Files in Node.js

Step 1

Create a dummy JSON file:

Save the above JSON file as dummy.json.
After this, save the same file as demo.txt.

Step 2

Decide whether you want to go in for the synchronous or asynchronous method of reading the above created JSON file.

Talking about synchronous method of reading a JSON file, it basically refers to one-way execution wherein there is a single flow which executes the JSON file line by line. The file will move to the next statement only after the statement has completed. As compared to synchronous call, in an asynchronous call, the flow-control will move to the next line by displaying the concerns over the statement's completion. While synchronous is also referred to as blocking calls, asynchronous refers to non-blocking calls.

Step 3

Depending upon your selection of the method for reading the JSON file, the outputs would vary.

The code for synchronous call will be displayed like this:

Also, the synchronous output (single-flow) will be displayed like this:

Now, the final output will be like this:

Here's a look at some common operations that can be performed for a JSON object in Node.js:

Converting a JSON object to a String

You can opt for the 'stringify' method for converting the JSON object into a string data as shown below:

Converting a String to a JSON object

The code associated with using the built-in global JSON Object for parsing a string containing JSON data is shown below:

As an alternative, you can also use the “trim()” method available on the string. This works under a situation when there are some chances of having any extra space within the JSON string.

Automatically Reading a JSON file

The code which can be used for making Node.js automatically read the JSON file is shown below:

Here, Node.js will parse the content to a particular JSON object and assign the same to the variable placed on the left hand side.

Adding a New Element to an existing JSON Object

For instance, you already have a JSON object and you're interested in modifying it by adding a new key/value pair(). You can do the same in either of the two ways shown below:

Traversing through each element within a JSON object

If you're interested in traversing through each and every element within the JSON object, then the same can be done using a 'for' loop as explained in the code snippet:

Here, do note that the above code can give you an error if the value is the JSON Object itself. Hence, it is recommended to check whether the value is JSON or not. Once you're certain about this, you can proceed ahead to handling the JSON object.

Checking whether the JSON object has a specific key

If you're required to check whether the JSON object has a specific key or not, you can do the same using the below mentioned code snippet:

Deleting an element from the JSON Object

You can use the 'delete' keyword for selecting an element from a particular JSON Object as explained in below example:

That's it for now!

Conclusion

Node Js Php

Here's hoping the above post would allow you to get into the details of using JSON files in Node.js. So, do keep it as a reference for all your forthcoming web development projects.

Node Js Php Serialize Data Into Json

About the Author:

Rick Brown is a programmer who has helped companies gain momentum with their small and large scale projects. If you need to iPhone app developer for hire then simply get in touch with Rick via Twitter. He is currently working for Mobiers Ltd., a leading mobile app development company.

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