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# Description Provides the ability to read and write [JSON lines](https://jsonlines.org/) files. This is accomplished by exposing the support already in Polars. ## Opening a JSON lines file <img width="1668" alt="Screenshot 2023-05-25 at 5 25 30 PM" src="https://github.com/nushell/nushell/assets/56345/3b213c3d-eea1-440a-8425-4ce4b39ab7d1"> ## Saving a dataframe to a JSON lines file <img width="848" alt="Screenshot 2023-05-25 at 5 15 57 PM" src="https://github.com/nushell/nushell/assets/56345/56089990-e14b-4f01-b676-5abab9333d7e">
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.