Open-Source Testing · authorjapps

zerocode

Zerocode is an open-source, no-code testing framework for APIs, Kafka, and databases using JSON/YAML. Tests are defined declaratively without writing code, reducing maintenance overhead and enabling non-technical users to author and maintain automated tests.

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Source: GitHub — github.com/authorjapps/zerocode

GitHub stars

445

Forks

Java

Primary language

Apache-2.0

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	authorjapps/zerocode
Owner	authorjapps
Primary language	Java
License	Apache-2.0 — OSI-approved
Stars	1k
Forks	445
Open issues	133
Latest release	1.4.3 (2026-05-26)
Last updated	2026-06-29
Source	https://github.com/authorjapps/zerocode

What zerocode is

A Java-based framework that interprets JSON/YAML test scenarios to validate REST/SOAP APIs, Kafka streams, and databases. It handles request/response validation, retry logic, assertions, and load testing through a declarative DSL with support for lenient/strict verification modes and JSONPath assertions.

Quickstart

Get the zerocode source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/authorjapps/zerocode.git2cd zerocode3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Microservices API Contract Testing

Define and validate REST/SOAP API contracts in JSON/YAML without code. Ideal for teams practicing API-first design or consumer-driven contract testing, where test scenarios serve as living documentation.

Kafka Event Stream Validation

Validate real-time data streams and message ordering/content in Kafka topics. Useful for data pipeline testing, event-driven architecture validation, and ensuring data quality across microservices.

Load and Performance Testing at Scale

Run performance and stress tests against APIs and databases using declarative configuration. Enables teams to baseline performance, identify bottlenecks, and validate SLAs without writing performance test code.

Implementation considerations

Requires Java runtime and Maven/Gradle setup; minimal additional dependencies, but ensure Java 8+ compatibility with target microservices.
Test scenarios are authored in JSON/YAML files; establish naming conventions, folder structure, and version control practices early to keep test suites maintainable as they grow.
Leverage JSONPath and assertion matchers for flexible validation; familiarize teams with lenient vs. strict verification modes to avoid brittle tests.
Steply CLI mentioned in README as optional companion tool; clarify whether it is required or if the Java framework runs standalone (README ambiguity noted).
Plan for environment configuration management (properties files, secrets) to avoid hardcoding URLs, credentials, or API keys in test scenarios.

When to avoid it — and what to weigh

Complex Custom Test Logic Required — If test scenarios require intricate conditional branching, dynamic payload generation, or complex domain-specific logic, the no-code declarative model may force workarounds or require custom extensions.
Heavy UI/Frontend Testing — Zerocode is purpose-built for APIs, Kafka, and databases. Use Selenium, Cypress, or Playwright for browser-based UI automation; this framework is not a replacement.
Low Team Buy-In for Declarative Testing — Success depends on teams embracing declarative, JSON-driven test scenarios. Teams accustomed to code-first frameworks may find ramp-up friction and may prefer traditional BDD frameworks (Cucumber, JBehave).
Minimal Community or Vendor Support Tolerance — Project is community-driven with 1009 stars and 133 open issues. Response times and support are unpredictable; orgs requiring SLA-backed support should evaluate commercial alternatives.

License & commercial use

Licensed under Apache License 2.0, a permissive open-source license that permits commercial use, modification, and distribution with attribution and indemnification clauses.

Apache 2.0 permits commercial use. However, this is community-maintained open source; there is no commercial vendor, SLA, or official paid support. Orgs using Zerocode commercially should budget internal engineering capacity for maintenance and troubleshooting. The README claims usage by Vocalink, HSBC, and HomeOffice; verify independently if production adoption is a concern.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Strong
License clarity	Clear
Deployment complexity	Low
DEV.co fit	Good
Assessment confidence	High

Security considerations

No security audit or penetration testing data provided. Considerations: (1) Test scenarios may contain API keys, credentials, or sensitive data; enforce secret management (environment variables, vaults) rather than storing in JSON files. (2) Kafka tests may require TLS/SASL; ensure framework supports encryption in transit. (3) Database tests should use read-only test accounts or transactions rolled back automatically. (4) No mention of SAST, dependency scanning, or supply-chain security practices in provided data. Requires review for production environments.

Alternatives to consider

Postman (with Newman CLI)

Cloud-native API testing with visual UI, collaborative collections, and built-in monitoring. Better for teams preferring UI-driven workflows; less suited for CI/CD-heavy or Kafka/database testing.

RestAssured (Java)

Code-first BDD framework for REST API testing. Offers more flexibility and IDE support; steeper learning curve. Better fit for teams with strong Java expertise who prefer programmatic control.

Cucumber + Gherkin

BDD framework with natural-language syntax; bridges business and technical teams. More expressive for complex scenarios but requires coding support and more boilerplate than Zerocode's declarative model.

Software development agency

Build on zerocode with DEV.co software developers

Review the documentation, test the quick-start guide, and assess fit against your team's expertise and environment stability requirements. Community support is active; validate long-term maintenance expectations.

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Related open-source tools

Surfaced by semantic similarity across the DEV.co open-source index.

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zerocode FAQ

Can Zerocode replace JUnit/TestNG for API testing?

Partially. Zerocode excels at declarative API, Kafka, and database validation without code. For unit tests or complex custom logic, JUnit/TestNG remain the standard. Many teams use Zerocode for integration/E2E and JUnit for unit tests.

Does Zerocode support OAuth, JWT, or custom headers?

Yes, implicitly via request headers in JSON/YAML (see README example with Content-Type). OAuth token refresh or JWT issuer integration requires clarification; check documentation or community examples.

Is Steply CLI required to run Zerocode tests?

Unknown from provided data. README mentions Steply CLI as an optional language-independent mode, but details on standalone Java framework execution are not clear. Verify with documentation or GitHub discussions.

How does Zerocode handle data cleanup or test isolation?

Not clearly stated in provided data. Test scenarios can include setup/teardown steps (implied by README's focus on outcome-driven tests), but details on transactions, rollback, or fixtures require documentation review.

Software developers & web developers for hire

Adopting zerocode is usually one piece of a larger software development effort. As a software development agency, DEV.co provides software development services and web development expertise — pairing senior software developers and web developers with your team to design, build, and operate open-source testing software in production.

Evaluate Zerocode for Your Testing Stack

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