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EJDB2

EJDB2 is a free, open-source JSON database engine implemented as a C library for embedding in applications.

Place
#8 of 30
Score
6.9
EJDB2's website

What EJDB2 is

EJDB2 is a free, open-source JSON database engine implemented as a C library for embedding in applications. It stores data in a single file using the IOWOW persistent key/value engine. Its JQL query language has an XPath-like approach and supports filtering, data changes, collection joins, projections, sorting, indexes, and options to skip, limit, or count results. The project also lists online backup support. For network access, the standalone jbs server provides HTTP REST and WebSocket endpoints. It supports TLS 1.2, can require a token in the X-Access-Token HTTP header, and offers a write-ahead-log option for data durability. EJDB2 provides a C11 API and lists macOS, iOS, Linux, and Windows support, as well as self-hosted use. It is licensed under MIT. The repository links to language bindings and tags C, Dart, Flutter, Java, Node.js, React Native, and Swift; after a 2025 cleanup, the changelog says only the Java and Node.js bindings are maintained. The README says the issues tracker is disabled and welcomes contributions and pull requests.

Good

  • Single-file storage uses the IOWOW persistent key/value engine.
  • JQL supports joins, indexes, sorting, and result limits.
  • Standalone server provides HTTP REST and WebSocket endpoints.
  • MIT-licensed and free to use.
  • Supports online backup and a write-ahead-log option.

Watch out

  • Only Java and Node.js bindings are maintained after the 2025 cleanup.
  • The project issues tracker is disabled.
  • The maintained bindings list is narrower than the linked language tags.

Who it suits

EJDB2 may suit developers looking to embed a JSON database in an application or use its standalone server for network access. Its listed platforms include desktop and mobile systems, and self-hosted deployment.

Verdict

EJDB2 offers an embeddable JSON engine with a broad query feature set and optional network server. Developers should account for the limited maintained bindings and disabled issues tracker.

Plans and prices

From EJDB2's own pricing page, checked 8 Oct 2026.

All about pricing
PlanPriceWhat it gives you
EJDB2FreeMIT-licensed open-source database engine

The facts

Each one read from EJDB2's own pages, with the date it was checked.

What it does

API
EJDB2 provides a C11 API.checked 8 Oct 2026
Authentication
The network API example starts the server with an access token and sends it in the X-Access-Token request header.checked 8 Oct 2026
Backups
The project lists support for online backups.checked 8 Oct 2026
Bindings
The repository links to native language bindings and tags the project with C, Dart, Flutter, Java, Node.js, React Native, and Swift.checked 8 Oct 2026
Durability
The jbs server offers a write-ahead-log option for data durability.checked 4 Oct 2026
Joins
The project supports joins between collections.checked 8 Oct 2026
License
The repository describes EJDB2 as published under the MIT license.checked 8 Oct 2026
Maintained bindings
The project changelog says that after its 2025 cleanup, only the Java and Node.js bindings are maintained.checked 4 Oct 2026
Network access
The project provides HTTP REST and WebSocket endpoints through IWNET.checked 8 Oct 2026
Product
EJDB2 is an embeddable JSON database engine written as a C library.checked 8 Oct 2026
Query capabilities
JQL supports filtering, data modification, projections, sorting, and query options such as skip, limit, and count.checked 8 Oct 2026
Query features
JQL supports collection joins, projections, sorting, indexes, and query options such as skip, limit, and count.checked 4 Oct 2026
Query language
Its JQL query language is inspired by XPath and Unix shell pipes and is designed for querying and updating JSON documents.checked 8 Oct 2026
Security
The jbs server supports TLS 1.2 and can require an access token in the X-Access-Token HTTP header.checked 4 Oct 2026
Storage
The project lists a single-file database powered by IOWOW, a persistent key/value storage engine.checked 8 Oct 2026
Support
The project README says its issues tracker is disabled and welcomes contributions and pull requests.checked 4 Oct 2026
Support and contributions
The repository says its issues tracker is disabled and welcomes contributions through pull requests.checked 8 Oct 2026

Where it runs

Supported platforms
The README lists macOS, iOS, Linux, and Windows as supported platforms and says the core was tested on Linux, macOS, and FreeBSD.checked 8 Oct 2026

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