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Jsonlite and rjson are both R packages that enable users to read and write data in JSON format. However, there are some key differences between the two packages.

One major difference is that jsonlite is designed to be faster and more memory-efficient than rjson. This is because jsonlite uses C++ code to perform parsing and serialization, while rjson is written entirely in R. As a result, jsonlite is generally the preferred package for working with large data sets or generating JSON output as part of a web service.

Another difference is that jsonlite supports more advanced features of JSON, such as handling non-standard numeric types and preserving the order of object keys. rjson, on the other hand, is more limited in its capabilities and is mostly used for simple data structures.

Overall, jsonlite is the more powerful and efficient package for working with JSON in R, while rjson may be a better choice for small or simple projects.