Frontend Frameworks

Syntax Transformer

ANTLR Grammar for OpenFGA DSL and JSON Syntax Parser in JavaScript

Status
Generally available
Last checked
Checked · Oct 10, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

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.

The only JavaScript library providing ANTLR Grammar and JSON Syntax parsing capabilities specifically tailored for the OpenFGA access control system.

When it fits — and when it doesn’t

A good fit 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

Look elsewhere if

  • 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

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Steep learning curve for non-ANTLR developers

    Understanding and customizing ANTLR grammars requires deep knowledge of both ANTLR and the OpenFGA DSL.

  2. 02

    Limited documentation on advanced use cases

    The official documentation lacks detailed examples for complex policy scenarios, making it hard to implement sophisticated access control rules.

  3. 03

    Performance overhead due to parsing complexity

    ANTLR-based parsing can introduce significant latency in high-throughput applications, impacting real-time performance.

  4. 04

    Dependency on ANTLR version compatibility

    The tool's functionality may break or require manual adjustments when upgrading ANTLR versions due to changes in the underlying framework.

What it does well

  • ANTLR Grammar for OpenFGA DSL

  • Parser from and to the OpenFGA JSON Syntax

  • Useful for developers working with policy-based access control systems

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

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Set up Syntax Transformer

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
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Syntax Transformer — tracked on AI Navigator

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