Syntax Transformer
ANTLR Grammar for OpenFGA DSL and JSON Syntax Parser in JavaScript
Pricing
Free tier
Flat rate
Adoption
→StableLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is Syntax Transformer?
Provides a JavaScript implementation of ANTLR Grammar for the OpenFGA DSL, enabling parsing from and to the OpenFGA JSON syntax. Useful for developers working with policy-based access control systems.
Key differentiator
“The only JavaScript library providing ANTLR Grammar and JSON Syntax parsing capabilities specifically tailored for the OpenFGA access control system.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Understanding and customizing ANTLR grammars requires deep knowledge of both ANTLR and the OpenFGA DSL.
The official documentation lacks detailed examples for complex policy scenarios, making it hard to implement sophisticated access control rules.
ANTLR-based parsing can introduce significant latency in high-throughput applications, impacting real-time performance.
The tool's functionality may break or require manual adjustments when upgrading ANTLR versions due to changes in the underlying framework.
Fit analysis
Who is it for?
✓ Best for
Teams building applications that need precise policy-based access controls using the OpenFGA framework
Developers who require a JavaScript library to parse and generate OpenFGA JSON syntax for their projects
✕ Not a fit for
Projects requiring real-time streaming of authorization decisions (this tool is not designed for real-time operations)
Applications that do not use or plan to integrate with the OpenFGA framework
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Works well with
Integrations
Next step
Get Started with Syntax Transformer
Step-by-step setup guide with code examples and common gotchas.