PACER is the official portal for federal dockets. Though PACER is available to the public, users must register, and the interface is clunky. Once users are approved and provided credentials they may access dockets free of charge, but must pay a per-page fee to access individual documents. State and local courts maintain their own docket portals; do not search PACER for a state case!
Lexis and Westlaw also have products providing docket coverage; like Bloomberg Law, Lexis’s CourtLink platform pulls from PACER.
Dockets in Westlaw Edge are available from the home page under the "Specialty areas" heading. See the Coverage Map for details regarding available courts and dates of coverage, organized by by jurisdiction.
To access dockets from Lexis Advance, researchers can select "Dockets" under the "Content" heading on the home screen, or can launch CourtLink from the grid icon at the top left of the home screen. See the "Court Information" and "Court Availability" links near the docket search menus to determine scope of coverage.
Bloomberg Law[1] obtains its docket content from PACER, and offers a cleaner interface and improved search functionality versus PACER.
[1] Vanderbilt users have unrestricted access to Bloomberg Law, both during the school year and the summer.