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API Test Base

Test what your API really did·apitestbase.io

API Test Base is a free, offline-first tool for testing APIs and verifying not just their HTTP responses but their side effects, such as database records written, messages published to a queue, and downstream services called. It supports multiple protocols beyond HTTP, including IBM MQ, JMS, AMQP, MQTT, FTP/SFTP file triggers, and SOAP calls. Test cases are created with a no-code/low-code UI and can be run locally or automated in a CI/CD pipeline. It is built around a method called Integration Unit Testing, which treats an API as a black box tested against stub dependencies.

What it's for

Verify an API's HTTP response and its side effects (database writes, queue messages, downstream calls) in one test caseTest APIs triggered by queue messages (IBM MQ, JMS, AMQP, MQTT)Test APIs triggered by file drops on FTP or SFTP serversTest SOAP APIsAutomate integration unit tests in a CI/CD pipelineSet up test data (e.g. clear/insert database records) as part of a test caseStand up a dedicated stub database in a throwaway Docker container for test isolationData-driven testing with multiple data sets in a single test caseMock external services using HTTP stubs

Features 15

Built around Integration Unit Testing method (black-box API testing with stub dependencies)
Built-in test setup steps within a test case (e.g. database seed, HTTP call, database check)
Can stand up a dedicated stub database (e.g. PostgreSQL) in a throwaway Docker container
CI/CD pipeline automation of test suites
Data-driven testing with multiple data sets
Docker support for running the tool and stub dependencies
Git-based team collaboration
HTTP stubs (mock servers)
No-code / low-code test case creation
Offline-first, all data stored locally
Pattern-based test case generation
Standalone requests and structured test cases
Structured test setup reusable across folders
Supports multiple protocols: HTTP, IBM MQ, JMS, AMQP, MQTT, FTP, SFTP, SOAP
Verifies API side effects (database, queue, downstream calls) alongside HTTP response

At a glance

free tier

TypeDesktop app

DeploymentInstalled (local)

PlatformsWindows, macOS, Linux

Integrations

IBM MQJMSAMQPMQTTFTPSFTPSOAPPostgreSQLDockerH2

Resources

Docs

Pricing

Product is free with no paid tiers available.

FreeFree

Described as a free, offline-first tool; no account or cloud required, run locally or in CI/CD.