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SchemaCrawler

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What SchemaCrawler is

SchemaCrawler is free software for discovering and understanding database schemas, with uses in database documentation and data governance. Its command-line tools turn database metadata into plain text, HTML5, HTML5 with embedded diagrams, JSON, or YAML. The output formats are designed to make schema differences easier to spot. SchemaCrawler can also create entity-relationship diagrams and run JavaScript or Python scripts through a live database connection. It supports almost any database with a JDBC driver, though some proprietary drivers need to be obtained separately. Documented integrations include Apache Maven, GitHub Actions, GitLab pipelines, Docker, Graphviz, and templating engines such as Velocity, Thymeleaf, FreeMarker, and Mustache. The templating engines are separate downloads. Its AI MCP Server allows natural-language exploration of database structure and table relationships, as well as SQL query generation. SchemaCrawler runs on operating systems supporting Java SE 17 or better and offers a browser-based command-line tutorial.

Who it suits

SchemaCrawler suits people who need to document or compare database schemas, generate diagrams, or explore database structure. It may also fit teams using Java-compatible operating systems and command-line workflows.

What it does well

  • Free and open-source software
  • Outputs metadata in text, HTML5, JSON, or YAML
  • Generates entity-relationship diagrams
  • Supports almost any database with a JDBC driver
  • Offers a browser-based command-line tutorial

What to know first

  • Requires an operating system supporting Java SE 17 or better
  • Some proprietary database drivers need separate downloads
  • Templating engines are not included in the download
  • Security guidance cautions that executed scripts are not vetted

Plans

PlanBilled and limitsPrice
SchemaCrawlerFree and open-source software · bundled JDBC-driver distributions are GPL v3 · commercial-use licensing terms can be arrangedFree

As schemacrawler.com lists them, read 30 Sept 2026. The maker's own page has the final word.

Getting started

  1. Visit https://www.schemacrawler.com/.
  2. Use the live online command-line tutorial in a browser, or download SchemaCrawler for an operating system that supports Java SE 17 or better.
  3. Connect to a database with a JDBC driver, downloading a proprietary driver separately if needed.
  4. Run the command-line tools and choose a metadata output format or generate an entity-relationship diagram.

Verdict

SchemaCrawler provides a broad set of schema discovery, documentation, comparison, and diagramming options at no software cost. Note that some drivers and templating engines must be downloaded separately, and its security guidance places responsibility for scripts on users.

Questions

How much does SchemaCrawler cost?

SchemaCrawler is free and open-source software. Commercial-use licensing terms can be arranged; bundled JDBC-driver distributions are GPL v3.

Which databases does it support?

It supports almost any database with a JDBC driver. Some proprietary drivers must be downloaded separately.

Which operating systems can run SchemaCrawler?

It works on operating systems that support Java SE 17 or better. Listed platforms include Linux, macOS, and Windows.

What output formats are available?

The command-line tools can produce plain text, HTML5, HTML5 with embedded diagrams, JSON, or YAML.

Does SchemaCrawler include templating engines?

No. Templating engines such as Velocity, Thymeleaf, FreeMarker, and Mustache must be downloaded separately.

What support is available?

Community support is available on Stack Overflow. Professional Support Packages provide direct access to the author and can cover project advice or consulting; older-version support requires such a package.

Facts from SchemaCrawler's own pages

AI interface
The SchemaCrawler AI MCP Server supports natural-language interaction for exploring database structure, understanding table relationships, and generating SQL queries. · schemacrawler.com, 30 Sept 2026
Database support
It supports almost any database with a JDBC driver, though some proprietary drivers must be downloaded separately. · schemacrawler.com, 30 Sept 2026
Diagrams and scripts
SchemaCrawler can generate entity-relationship diagrams and execute scripts in JavaScript or Python against a live database connection. · schemacrawler.com, 30 Sept 2026
Integrations
The site documents integrations with Apache Maven, GitHub Actions, GitLab pipelines, Docker, Graphviz, and templating engines including Velocity, Thymeleaf, FreeMarker, and Mustache. · schemacrawler.com, 30 Sept 2026
Online tutorial
A live online command-line tutorial works in a browser without additional software or plugins. · schemacrawler.com, 30 Sept 2026
Output formats
The command-line tools can output database metadata as plain text, HTML5, HTML5 with embedded diagrams, JSON, or YAML. · schemacrawler.com, 30 Sept 2026
Platform requirement
SchemaCrawler works on operating systems that support Java SE 17 or better. · schemacrawler.com, 30 Sept 2026
Purpose
SchemaCrawler is a free database schema discovery and comprehension tool for database documentation and data governance. · schemacrawler.com, 30 Sept 2026
Schema comparison
Its schema output formats are designed to make it easy to find differences between database schemas. · schemacrawler.com, 30 Sept 2026
Security
The security guidance says SchemaCrawler cannot vouch for the security of scripts it executes and recommends removing the scripting JAR if scripting is not needed. · schemacrawler.com, 30 Sept 2026
SQL Server encryption
The security guidance says the server, host, and port connection method turns off encrypted connections and recommends a trusted certificate and a URL containing encrypt=true. · schemacrawler.com, 30 Sept 2026
Support
Community support is available on Stack Overflow, while professional support packages provide direct access to the author and can cover project advice or consulting. · schemacrawler.com, 30 Sept 2026
Support scope
The support page says only the latest SchemaCrawler version receives new feature development and security updates, and older-version support requires a Professional Support Package. · schemacrawler.com, 30 Sept 2026
Templating limit
Templating engines are not included in the SchemaCrawler download and must be downloaded separately. · schemacrawler.com, 30 Sept 2026

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