Jayway JsonPath is a mature Java library that implements Stefan Goessner's JSONPath specification, providing an XPath-like query language for JSON documents. It enables reading, filtering, writing, and transforming JSON data through a fluent API. The core entry point is the `JsonPath` class, which offers static methods like `read()` and `parse()`, returning `DocumentContext` for chained operations such as `set()`, `delete()`, `add()`, `put()`, `renameKey()`, and `map()`. The library supports a rich filter system via `Filter`, `Criteria`, and `Predicate` interfaces, allowing both inline path filters (e.g., `[?(@.price < 10)]`) and programmatic construction. It also includes a function system for aggregation (`min`, `max`, `avg`, `sum`, `stddev`) and text operations (`length`, `concat`). Architecturally, the library follows a Service Provider Interface (SPI) pattern with `JsonProvider` and `MappingProvider` abstractions, enabling pluggable JSON backends. It ships with providers for Jackson 2, Jackson 3, Gson, Json-smart, JsonOrg, Jakarta JSON-P, Jettison, and Tapestry. The `Configuration` class is immutable and built via a builder, centralizing options like `REQUIRE_PROPERTIES` and `DEFAULT_PATH_LEAF_TO_NULL`. Path compilation is cached via a configurable `CacheProvider` (default LRU). The separate `json-path-assert` module provides Hamcrest matchers (`hasJsonPath`, `withJsonPath`, `isJson`) for testing. External dependencies are minimal for the core module (only `net.minidev:json-smart` for the default provider), with optional dependencies for other providers. The library is built with Gradle, targets Java 17, and has extensive JUnit 5 test coverage including regression tests for hundreds of reported issues. It is designed for integration into any Java application that needs to query or manipulate JSON data programmatically.