Jolt vs fastjson

Jolt

JSON to JSON transformation library written in Java. (by bazaarvoice)

JSON Processing

Source Code

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fastjson

FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade. (by alibaba)

JSON Processing Fastjson Java Android JSON json-parser json-serialization json-serializer Serialization Deserialization best-performance

Source Code

github.com

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Jolt		fastjson
	Project
3	Mentions	3
1,503	Stars	25,633
1.1%	Growth	0.2%
1.9	Activity	1.5
about 1 month ago	Latest Commit	about 1 month ago
Java	Language	Java
Apache License 2.0	License	Apache License 2.0

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

Jolt

Posts with mentions or reviews of Jolt. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-07-22.

Manipulating JSON responses in Spring Boot
1 project | /r/learnjava | 13 Apr 2022

Check this framework : https://github.com/bazaarvoice/jolt
How to handle nested JSON with Apache Spark
1 project | dev.to | 3 Feb 2022

Conclusion: Semi-Structured Data is challenging to work with when you are getting the data in nested form. Hopefully, this post gives you an overview of how to perform a simple ETL on JSON data. You can make modifications to the logic and find out more about how to get the desired results. References: https://github.com/bazaarvoice/jolt/releases
[Jackson] Deserialize nested value in top level field
2 projects | /r/javahelp | 22 Jul 2021

To trasform a json I usually use jolt.

fastjson

Posts with mentions or reviews of fastjson. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-01.

The Newest Java Json Benchmark Results just dropped
8 projects | /r/java | 1 May 2023

fastjson
[Release] Java Tron GreatVoyage-v4.4.6 (David)
1 project | /r/TronLabs_RO | 25 May 2022

Update for a security vulnerability in fastjsonhttps://github.com/alibaba/fastjson/wiki/security_update_20220523two improvements are suggested:
Ask HN: Differences in Programming Style by Nationalities
1 project | news.ycombinator.com | 19 Apr 2021

I first noticed a difference in national styles when I contributed a patch to fastjson, a JSON parser in Java from Alibaba.
Take a look around the repo; it'll look odd to a western programmer. There is a lot of duplication. And the tests don't have names, they are numbered.
https://github.com/alibaba/fastjson/blob/master/src/test/jav...
This was several years ago. I did end up choosing it since it really was the fastest.

What are some alternatives?

When comparing Jolt and fastjson you can also consider the following projects:

JSLT - JSON query and transformation language

JsonPath - Java JsonPath implementation

MapNeat - MapNeat is a JVM library written in Kotlin that provides an easy to use DSL (Domain Specific Language) for transforming JSON to JSON, XML to JSON, POJO to JSON in a declarative way.

Moshi - A modern JSON library for Kotlin and Java.

JsonSurfer - A streaming JsonPath processor in Java

sawmill - Sawmill is a JSON transformation Java library

jq - Command-line JSON processor [Moved to: https://github.com/jqlang/jq]