rest-assured
REST Assured is a Java library that simplifies testing of REST APIs by providing a fluent, readable DSL inspired by dynamic languages like Groovy and Ruby. It handles request building, response validation, and supports multiple content types (JSON, XML) with built-in authentication and parameter handling.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | rest-assured/rest-assured |
| Owner | rest-assured |
| Primary language | Java |
| License | Apache-2.0 — OSI-approved |
| Stars | 7.1k |
| Forks | 1.9k |
| Open issues | 592 |
| Latest release | Unknown |
| Last updated | 2026-02-04 |
| Source | https://github.com/rest-assured/rest-assured |
What rest-assured is
REST Assured offers a fluent Java DSL for HTTP testing with JsonPath and XmlPath parsing, support for multiple authentication schemes, and integration with Spring MockMvc. Version 6.0.0 (Dec 2025) targets Java 17+, Groovy 5, and Spring 7, with active maintenance and regular releases.
Get the rest-assured source
Clone the repository and explore it locally.
git clone https://github.com/rest-assured/rest-assured.gitcd rest-assured# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Java 17+ required as of v6.0.0; teams on older JDKs must stay on 5.x branch.
- Fluent DSL requires familiarity with builder pattern; learning curve minimal for Java developers but documentation review recommended.
- JsonPath and XmlPath syntax must match response structure; complex nested assertions benefit from experimentation in test.
- Authentication support includes Basic, Form, Digest, OAuth2; ensure chosen mechanism aligns with API security design.
- Mock response setup (mock servers, WireMock integration) is test author responsibility; REST Assured does not provide server mocking itself.
When to avoid it — and what to weigh
- Non-JVM Ecosystems — REST Assured is Java-only. If your tech stack is Python, Go, Node.js, or other non-JVM languages, use language-native libraries (pytest-requests, go-resty, etc.).
- Performance/Load Testing — REST Assured is designed for functional testing, not load or stress testing. Use JMeter, Gatling, or k6 for that use case.
- Real-time WebSocket Testing — REST Assured is HTTP-focused. WebSocket and real-time communication testing requires dedicated tools (e.g., Spring WebTestClient for reactive flows).
- Minimal Dependency Budget — REST Assured has transitive dependencies on Groovy, Hamcrest, and others. If your project requires ultra-minimal dependency footprint, consider plain Java HTTP clients.
License & commercial use
Licensed under Apache License 2.0 (Apache-2.0), a permissive OSI-approved license.
Apache 2.0 permits commercial use, modification, and distribution with minimal restrictions (attribution required, liability disclaimed). No commercial support or licensing fees mentioned in provided data. For SaaS or proprietary redistribution, consult Apache 2.0 terms or seek vendor guidance.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Strong |
| Assessment confidence | High |
REST Assured handles basic, form, digest, and OAuth2 authentication mechanisms; credential storage and retrieval is test author responsibility. Library does not validate SSL/TLS certificate pinning out-of-box; HTTPS URLs supported but secure configuration depends on underlying HTTP client (HttpClient, OkHttp) and JVM settings. Test code containing credentials should follow secrets management best practices. No known public CVEs mentioned in provided data; requires independent security audit for compliance-sensitive deployments.
Alternatives to consider
Spring WebTestClient / TestRestTemplate
Spring-native for Spring Boot apps; reactive (Flux/Mono) support; no external dependency. Less fluent syntax than REST Assured, but tighter integration with Spring.
WireMock
HTTP mocking and stubbing library; complements REST Assured by providing mock servers. Often paired together, not a direct replacement, but reduces need for real endpoints in testing.
Karate (by Cucumber team)
DSL for REST/GraphQL/Kafka testing; Gherkin-based and language-agnostic. Better for BDD-style test authoring; less Java-centric than REST Assured.
Build on rest-assured with DEV.co software developers
REST Assured simplifies integration and contract testing for Java and Spring applications. Our team can help design test frameworks, CI/CD pipelines, and automation strategies for your API landscape.
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rest-assured FAQ
Does REST Assured support graphQL?
Can REST Assured test WebSockets or gRPC?
What is the performance overhead of REST Assured vs. plain Java HTTP client?
Is REST Assured suitable for production monitoring or health checks?
Software development & web development with DEV.co
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Ready to streamline your REST API testing?
REST Assured simplifies integration and contract testing for Java and Spring applications. Our team can help design test frameworks, CI/CD pipelines, and automation strategies for your API landscape.