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devtools

Faster APIs with Specmatic

Ship APIs faster with Specmatic's AI-powered suite. For founders and teams building microservices and APIs.
intermediate⏱ 30 minutesπŸ’΅ Free (self-hosted)
389 stars65 forksKotlinQuality 8/10Updated 7/27/2026100% free Β· open source
What it is

Use Specmatic to write API code automatically from a specification without needing to write any code.

What you can make with it

Automations like: when a new user signs up, generate a user account on Stripe and push their info to a Notion database using GraphQL.

How it helps

It helps teams create APIs much faster and with less integration surprises by allowing them to transform their specifications into executable code instantly.

Real use case example

"A founder of a small startup, Maria, wants to add user management to her website. She writes a specification for creating a new user in her language of choice, and Specmatic instantly generates the API code. She then tests and integrates it into her website, all without any manual coding."

If you're new

Beginners can start using this skill to automate simple API integrations and get a feel for how API development works.

If you're senior

Senior engineers will use this skill to speed up API development and reduce the risk of integration errors in their projects.

Common confusion cleared up

Some users may confuse Specmatic with other automation tools, but it's primarily designed for no-code API development, making it a unique solution in this space.

Best inside these AI tools
Claude DesktopCursor
Pairs with
Stripe webhookNotion databaseGraphQL API
Why we list it on WorkflowStacks: This skill is included because it provides a no-code solution for API development, which can save teams a significant amount of time and cost.
What it does

Specmatic eliminates API integration headaches by transforming specifications into executable contracts instantly, allowing teams to ship APIs 10x faster with no coding required.

Install / run
Clone the Specmatic repository from GitHub using the command `git clone https://github.com/specmatic/specmatic.git`
When to use it
  • β€’When building microservices and APIs that require rapid development and testing
  • β€’When integrating with third-party APIs and needing to ensure contract compliance
  • β€’When teams want to reduce API integration surprises and improve overall development speed
Quick start
  1. 1Navigate into the cloned repository using `cd specmatic`
  2. 2Build the project using the command `./gradlew build`
  3. 3Generate a specification file using the command `specmatic spec generate`
  4. 4Transform the specification into an executable contract using `specmatic contract generate`
  5. 5Run the contract using `specmatic contract run` to test the API
Ready-to-paste prompt
Transform a sample specification file into an executable contract using the command `specmatic contract generate --spec src/test/resources/petstore.yaml`
Heads up: Ensure you have Java 11 or later installed on your system, as Specmatic is built using Kotlin and requires a compatible Java runtime environment
Saves to your device

Topics

asyncapi
backward-compatibility
cdd
contract-driven-development
contract-testing
graphql
grpc
jdbc
microservices
openapi
openapi3
overlay
redis
service-virtualization
specmatic
wsdl
What's inside β€” free to inspect
No purchase needed

Read the entire source before you build β€” unlike paid marketplaces that hide it behind a buy button.

18
top-level files
9
folders
23.6M
repo size
MIT
license
Key files
AGENTS.md
README.md
File tree
.github/
application/
conformance-tests/
core/
gradle/
jmx/
junit5-support/
META-INF/
specmatic-mcp/
.asyncapi-tool.json
.gitignore
AGENTS.md
build.gradle.kts
CHANGELOG.md
CODE_OF_CONDUCT.md
CONTRIBUTING.md
employee.csv
employees.csv
gradle.properties
gradlew
gradlew.bat
License.md
number.txt
README.md
Quick Actions
Details
Creator
specmatic
Language
Kotlin
Category
devtools
Published
3/16/2020

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