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Swagger Codegen

swagger.io

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Spec score 8.3 #3 of 25 in API Generation Software

What it is

Swagger Codegen is an open-source tool that generates API client libraries, server stubs and documentation from OpenAPI specifications. Its template-driven engine parses OpenAPI or Swagger definitions and produces project code from schemas. Swagger states that it can generate client SDKs in over 40 languages and server boilerplate in over 20. Listed capabilities include OpenAPI import, schema-to-code generation, project scaffolding, custom templates, an interactive API reference, code samples and a command-line interface. Outputs and integrations include HTML and Confluence Wiki documentation, Apache2 configuration files and JMeter. The project is available from GitHub under the Apache-2.0 license, with a hosted option through SwaggerHub. SwaggerHub can generate code in a selected language and push it to source-control repositories. Supported client targets include C#, Dart, Go, Java, JavaScript, Kotlin, PHP, Python, R, Ruby, Scala, Swift and TypeScript variants. Server targets include ASP.NET Core, Go, Java Vert.x and JAX-RS options. The repository warns that untrusted descriptions may cause code injection.

Spec sheet

What it does
Swagger Codegen generates API client libraries, server stubs and documentation from OpenAPI or Swagger definitions.Read 15 Oct 2026 · swagger.io
Purpose
Swagger Codegen generates API client libraries, server stubs, and documentation from OpenAPI specifications.Read 8 Oct 2026 · swagger.io
Intended users
Swagger describes Codegen as a way for API teams to reduce implementation plumbing and help end developers integrate with APIs.Read 8 Oct 2026 · swagger.io
License
The Homebrew formula identifies Swagger Codegen as Apache-2.0 licensed.Read 15 Oct 2026 · formulae.brew.sh
Headquarters
Somerville, Massachusetts, United StatesRead 28 Sep 2026 · swagger.io
Founded
2003Read 28 Sep 2026 · swagger.io
Company
Swagger is presented as supported by SmartBear, which says it was founded in 2003 and lists its global headquarters in Somerville, Massachusetts.Read 8 Oct 2026 · smartbear.com
Build integrations
Official workflow guidance covers Maven, Gradle and GitHub integration, including a script that pushes generated SDKs to GitHub.Read 15 Oct 2026 · swagger.io
Client generation
The product generates client SDKs in more than 40 languages.Read 15 Oct 2026 · swagger.io
Client languages
Swagger says Codegen can generate client SDKs in over 40 languages.Read 8 Oct 2026 · swagger.io
Command-line use
The CLI can be built with Maven and run as a Java JAR to generate a selected language target from a supplied specification.Read 15 Oct 2026 · swagger.io
Current release activity
The GitHub releases page shows version 3.0.82 changes including a Jackson update to 2.21.5 and a 3.0.82 snapshot bump.Read 15 Oct 2026 · github.com
Customization
Users can replace Mustache templates with their own directory and create custom generator modules using the meta command.Read 15 Oct 2026 · swagger.io
Docker CLI
A standalone Docker image can run the CLI without installing Java, using a mounted local volume for generated output.Read 15 Oct 2026 · swagger.io
Documentation depth
The documentation includes versioning, prerequisites, building, Docker, generators, workflow integration, validation and contribution guidance.Read 15 Oct 2026 · swagger.io
Documentation generation
Supported documentation outputs include HTML and Confluence Wiki.Read 15 Oct 2026 · swagger.io
Download and hosted option
The open-source project is available from GitHub, and Swagger Codegen is also available in the integrated SwaggerHub platform.Read 8 Oct 2026 · swagger.io
Generated-code ownership
The project says generated code is supplied as-is, owned by the user and not automatically subject to the parent project license.Read 15 Oct 2026 · github.com
Generation engine
The project uses a template-driven engine to parse OpenAPI or Swagger definitions.Read 8 Oct 2026 · github.com
Generators and integrations
Listed outputs and integrations include HTML and Confluence Wiki documentation, Apache2 configuration files, and JMeter.Read 8 Oct 2026 · github.com
Installation
Official installation options include downloading a JAR from Maven Central and installing through Homebrew.Read 15 Oct 2026 · swagger.io
Limit: beginner complexity
An independent review lists complexity for beginners as a disadvantage.Read 15 Oct 2026 · toolradar.com
Limit: generated-code quality
Developers on Reddit criticize generated code as sometimes awkward to consume, poor in quality or occasionally non-compiling depending on the generator.Read 15 Oct 2026 · reddit.com
Limit: separate release maintenance
A directory review says teams must choose between independently maintained 2.x and 3.x lines, adding version-maintenance overhead.Read 15 Oct 2026 · itechguides.com
Local specifications
Generation can use specification files stored locally instead of calling a remote API server.Read 15 Oct 2026 · swagger.io
Maker company size
LinkedIn lists SmartBear as a privately held software company with 501–1,000 employees and headquarters in Somerville, Massachusetts.Read 15 Oct 2026 · linkedin.com
Maker founded
SmartBear says Jason Cohen founded the company in 2003.Read 15 Oct 2026 · smartbear.com
Maker headquarters
SmartBear lists its global headquarters at 450 Artisan Way, Somerville, Massachusetts.Read 15 Oct 2026 · smartbear.com
Maker ownership and acquisitions
Crunchbase lists SmartBear as having three investors, including Francisco Partners and Vista Equity Partners, and 16 acquisitions.Read 15 Oct 2026 · crunchbase.com
Maker reach
SmartBear says its products are used by more than 32,000 organizations worldwide.Read 15 Oct 2026 · smartbear.com
Maven plugin
The Maven plugin supports input specification, target language, output path, package names, template directories, selective model or API generation, tests, documentation and supporting files.Read 15 Oct 2026 · github.com
Online generator API
The online generator exposes REST endpoints for listing languages, retrieving options, generating clients or servers, and downloading generated files.Read 15 Oct 2026 · generator.swagger.io
Outputs
The project can generate client SDKs, server stubs, and API documentation.Read 8 Oct 2026 · github.com
Praise: documentation and standards
An independent review praises Swagger's industry-standard position, open-source core and documentation quality.Read 15 Oct 2026 · toolradar.com
Praise: productivity
A Reddit discussion reports that generated API libraries save substantial manual work and can provide strongly typed clients when the specification is well defined.Read 15 Oct 2026 · reddit.com
Rating on Capterra
4.5 out of 5 from 16 reviewsRead 15 Oct 2026 · toolradar.com
Rating on G2
4.5 out of 5 from 190 reviewsRead 15 Oct 2026 · toolradar.com
Security caution
The repository warns that untrusted OpenAPI descriptions or Swagger files may cause code injection and should be reviewed before generation.Read 8 Oct 2026 · github.com
Security reporting
The project asks users to report security vulnerabilities by email to [email protected] rather than through the public issue tracker.Read 15 Oct 2026 · swagger.io
Security warning
Official documentation warns that untrusted OpenAPI or Swagger files may cause code injection during generation.Read 15 Oct 2026 · swagger.io
Self-hosting
The generator service can be deployed locally through a Docker image named swaggerapi/swagger-generator-v3.Read 15 Oct 2026 · swagger.io
Server generation
The product generates boilerplate server code in more than 20 languages.Read 15 Oct 2026 · swagger.io
Server languages
Swagger says Codegen can generate boilerplate server code in over 20 languages.Read 8 Oct 2026 · swagger.io
Specification support
Version 3.0.71 supports OpenAPI specification versions 1.0, 1.1, 1.2, 2.0 and 3.0, while version 2.4.46 supports versions through 2.0.Read 15 Oct 2026 · swagger.io
Supported desktop platforms
Homebrew provides bottles for macOS Apple Silicon, macOS Intel and Linux ARM64 or x86_64.Read 15 Oct 2026 · formulae.brew.sh
Supported specifications
The repository lists version 3.0.71 as compatible with OpenAPI 3.0 and earlier listed versions, while version 2.4.46 supports through OpenAPI 2.0.Read 8 Oct 2026 · github.com
System requirements
The documented binary prerequisite is Java 8 or newer; building from source requires Java 11 and Apache Maven 3.6.2 or newer.Read 15 Oct 2026 · swagger.io
Version lines
Swagger Codegen maintains separate 2.x and 3.x lines with different Maven group IDs; OpenAPI 3 support is provided by the 3.x line.Read 15 Oct 2026 · swagger.io
Workflow capabilities
SwaggerHub can generate code in a chosen language and push it to source-control repositories.Read 8 Oct 2026 · swagger.io

Plans and prices

Open-source Swagger Codegen Free client SDK generation · server-stub generation · documentation generation · 20+ server languages · 40+ client languages Read 15 Oct 2026 · swagger.io
Swagger Codegen Free Open source; no price listed Generates API clients, server stubs, and documentation from OpenAPI specifications Read 8 Oct 2026 · swagger.io

Every Swagger Codegen plan and price →

Strong points and limits

Strong points

  • Free Apache-2.0 open-source project
  • Generates clients, servers and documentation
  • Supports more than 40 client languages
  • Offers custom templates and project scaffolding
  • Available through CLI, GitHub and SwaggerHub

Limits

  • Untrusted specifications may cause code injection
  • Generated outputs depend on supported targets
  • SwaggerHub is a separate hosted option
  • Requires reviewing input files before generation

Who it suits

Swagger Codegen suits API teams and developers working from OpenAPI descriptions who want generated clients, servers, documentation and scaffolding. It supports self-hosted use as well as SwaggerHub workflows.

Verdict

Swagger Codegen provides specification-driven generation for client SDKs, server stubs and documentation across many languages. Its self-hosted project and SwaggerHub integration support both local and repository-based workflows.

Where Specifiction places it

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