FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.

Welcome to the Fauna v4 documentation

FQL v4 end of life

Published: June 4, 2024

FQL v4 will be decommissioned on June 30, 2025. If you’re currently using FQL v4, you will need to migrate your queries to FQL v10 by that date.

Since launching FQL v10 almost a year ago, customers who moved their production workloads to FQL v10 have given us overwhelmingly positive feedback on it. They have found FQL v10 easier to use, easier to maintain, and more powerful than previous versions of FQL.

To help make sure that all users are aware and ready for this change, we will temporarily limit FQL v4 queries for two short "brownout" periods in the weeks before the service is decommissioned.

How do I migrate?

Transition from FQL v4 to FQL v10 can be done incrementally and requires no changes to your underlying data.

We’ve provided a v4-to-v10 migration guide and an FAQ to give you more details on this transition.

You can also review the FQL v10 Language and API guide, to familiarize yourself with FQL v10 and its capabilities. FQL v10 features include:

  • A TypeScript-inspired syntax

  • Lightweight v10 client drivers

  • Collection-oriented indexes

  • Improved error responses

  • Static typing

Contact Fauna at support@fauna.com with any questions.

Migration resources

Learn about notable changes between FQL v4 and v10 and how to migrate your application.

Get answers to common questions related to FQL v4-to-v10 migrations.

What is Fauna v4?

Learn More Fauna is a flexible, developer-friendly, transactional database delivered as a secure and scalable cloud API. Fauna combines the flexibility of NoSQL systems with the relational querying and transactional capabilities of SQL databases.

Try it out

Quick start

Get up and running quickly with an interactive introduction to Fauna.

Build a sample app

Sample apps show Fauna features and capabilities in an application context.

New to Fauna Query Language?

The SQL to FQL translation reference can help you get started.


Build AWS applications.

Driver support

To start querying Fauna from your application code, choose your language:

What is in the documentation?

These three main content sections can help you learn Fauna:


Cookbooks icon Query and code examples for databases, collections, indexes, and user-defined functions.


Tools icon Full descriptions of the tools available with Fauna.

API Reference

API Reference icon Complete reference materials for the APIs you can use to interact with Fauna.

Explore key features

A selection of features that make Fauna easy to get started, powerful, and unique:


Configure authentication and access controls.

Data Import

Import JSON or CSV data into your database.


Stream changes to a client application.


Learn about built-in daily backup management and recovery.

Query Log

Download near real-time query logs for enhanced database observability.

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