How does Kazaam compare to Jolt for JSON transformations?

Kazaam is inspired by Jolt but implemented in Go, offering similar declarative specs with a focus on performance. While Jolt is Java-based, Kazaam provides Go-native integration and additional transforms like UUID generation, making it better for Go-centric projects.

How to handle arrays with Kazaam shift operation?

Use JSONPath-like syntax with [*] for wildcards or specific indices. For example, 'allGuids': 'doc.guidObjects[*].id' extracts all IDs from an array of objects, as shown in the README's shift transform examples.

Can Kazaam transform JSON with conditional logic?

Kazaam primarily uses declarative specs; for complex conditions, you might need to chain transforms or use custom transforms. Built-in operations like coalesce handle simple fallbacks, but advanced logic requires extension via custom code.

What's the performance impact of using Kazaam in high-throughput systems?

Kazaam is designed for speed by minimizing validation overhead. While benchmarks aren't provided, its design choices, such as skipping full JSON validation, suggest it's optimized for processing large volumes of JSON messages efficiently in Go applications.

How to install and use Kazaam as a Go module?

Use 'go get gopkg.in/qntfy/kazaam.v3' (or v4 as per docs) to fetch the library. The README includes examples of importing and using it in Go code, with a binary available for testing specs via the executable program setup.

Does Kazaam support error handling for missing paths?

Yes, operations like shift and concat support a 'require' field that, when set to true, throws an error if source paths are missing. However, error messages might be generic, so debugging complex specs can be challenging.

Open-Awesome

kazaam

MITGov4.0.1

A Go library for declarative JSON-to-JSON transformations using JSON specifications.

GitHub

293 stars52 forks0 contributors

What is kazaam?

Kazaam is a Go library for performing arbitrary JSON-to-JSON transformations using a JSON-based specification. It solves the problem of reshaping intermediate JSON data into formats required by third-party APIs, offering a declarative and programmatic approach. The library provides built-in operations like shift, concat, coalesce, and timestamp parsing to manipulate JSON structures efficiently.

Target Audience

Go developers working with data pipelines, API integrations, or ETL processes who need to transform JSON messages between different formats. It's also useful for developers building microservices that require flexible data reshaping.

Value Proposition

Developers choose Kazaam for its performance-focused design, rich set of built-in transformations, and ease of use via JSON specifications. Its support for custom transforms and JSONPath-like syntax provides greater flexibility compared to manual JSON manipulation or heavier transformation tools.

Overview

Arbitrary transformations of JSON in Golang

Use Cases

Best For

Transforming JSON messages between different API formats
Reshaping nested JSON structures using declarative specifications
Generating UUIDs or formatting timestamps within JSON data
Extracting and promoting sub-objects to top-level JSON
Coalescing values from multiple possible keys in JSON documents
Removing or setting default values for JSON fields programmatically

Not Ideal For

Systems requiring full JSON schema validation and compliance checks
Projects needing complex conditional logic or programming constructs within transformations
Teams working in non-Go ecosystems or polyglot microservices architectures
Applications that primarily handle non-JSON data formats like XML or Avro

Pros & Cons

Pros

High-Performance Design

Kazaam skips full JSON validation to prioritize speed, making it ideal for high-throughput data pipelines as mentioned in the README's philosophy section.

Rich Built-in Transforms

Offers nine operations like shift, concat, and timestamp parsing, providing comprehensive reshaping capabilities without custom code, as detailed in the Specification Support.

Declarative JSON Specs

Transformations are defined in JSON, allowing for easy versioning and modification of specs without recompiling Go code, inspired by Jolt.

Extensible with Custom Transforms

Supports pluggable transform types, enabling developers to add specialized operations while leveraging the core framework, as noted in the Features section.

Cons

No Built-in Validation

The library explicitly avoids full JSON validation for performance, which can lead to silent errors if input data is malformed, as admitted in the README.

Go-Language Lock-in

As a Go-only library, it's not suitable for projects in other languages, limiting its use in heterogeneous environments without additional integration layers.

Complex Specification Management

For intricate transformations, the JSON-based specs can become verbose and difficult to debug, especially with nested JSONPath expressions in operations like shift.

Open Source Alternative To

kazaam is an open-source alternative to the following products:

Jolt

Jolt is a JSON to JSON transformation library written in Java, used for specifying and executing declarative transformations on JSON data.

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