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The Insider's Guide to Accessing NLM Data

Insider's Guide Overview

New to Insider's Guide? Learn the basics of APIs, E-utilities, and PubMed.

What is E-utilities? When should you use E-utilities? How does E-utilities work?

Online Classes

Access all of our class materials, and sign up for upcoming sessions.


E-utilities Documentation

Dig into detailed documentation for using E-utilities with PubMed.

The Nine E-utilities E-utilities History Server


Get started using E-utilities in a Unix environment with EDirect.

EDirect Overview EDirect Documentation Installing EDirect

Welcome to the Insider's Guide!

The Insider's Guide is a series of educational resources to help users explore more powerful and flexible ways of accessing NLM data, with a focus on accessing PubMed data via the E-utilities API.

Our classes include an online instructional session (available live or asynchronous), and are supported by documentation, sample code, and other educational materials which you can find throughout this website.

If you are new to APIs and E-utilities, we suggest you start with our introductory class, "Welcome to E-utilities for PubMed". We hope that once you see how useful E-utilities is, you will continue to explore how you can put these tools to work for you!

Note: Discrepancies between E-utilities and PubMed

Following the release of the new version of PubMed, the results returned by E-utilities queries of PubMed may differ slightly from those returned in the web version of PubMed. A new PubMed API is currently under development: more information will be announced when available.

Last Reviewed: July 7, 2021