skyscreamer/JSONassert

Health v2 · maintenance only

Adoption not part of the score

1056 stars · 204 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A Java library for writing JSON unit tests with minimal code, comparing JSON strings by logical structure and data. It integrates with JUnit and offers a lenient mode that tolerates array reordering and extra fields, making REST API tests less brittle.

Use cases

• assert JSON responses in JUnit tests
• test REST API endpoints return expected JSON
• compare JSON structures ignoring field order
• write less brittle JSON assertions
• get readable diffs for JSON test failures
• enforce strict JSON equality when needed

When to choose

• you're testing Java/JVM services that return JSON
• you want concise, readable JSON assertions in JUnit
• you need lenient comparison that tolerates ordering and extra fields
• you want clear error messages pinpointing JSON differences

When to avoid

• you're not on the JVM (Java/Kotlin/Scala)
• you need JSON Schema validation rather than value comparison
• you need to compare very large JSON documents with performance constraints
• you need non-JSON formats like XML or YAML

Facets

library · maturity maintenance

testing json serialization testing developer-tools apis web-development jvm cli json-assertions junit rest-testing test-assertions

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markdown · JSON · MCP: product_card(name="skyscreamer/JSONassert")