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  • HTRC Technical FAQs
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Q1: What happened to the HTRC Sandbox?

A: The HTRC Sandbox, which was a space for testing and experimentation in the early days of the project, has been rolled into our production services available here:

  • HTRC Analytics: a set of tools for assembling collections of digitized text and performing text analysis on them. 
  • HTRC Data Capsule: for use of the production-level HTRC Data API

Q2: How do I use the HTRC Data API?

A: Check out our user's guide for more information about using the HTRC Data API in the HTRC Data Capsule.

Q3: What is the difference between the HTRC Data API and HathiTrust Data API?

A: This table outlines the differences between the HTRc Data API and HathiTrust Data API

purposeto serve high-performance large-scale algorithms and programsto provide public users some volume retrieval capabilities
throttling enforcementnoyes
bulk retrieval of volumesyesno
metadata availableMETSMETS, MARC

Q4: What happened to the HTRC Solr Proxy API?

As the HTRC moves to update and improve its search and workset-building services, the Solr Proxy API has been retired. For now, you can search for HathiTrust volumes via the HathiTrust Digital Library interface. Look for improved functionality in the near future, and please reach out with your workset-building scenarios that require additional search functionality. 

Q5: This is a release. Can I download the code?

A: Yes. All of the HTRC services code modules are open source and are available from GitHub:

Q6:  How do I contribute code to HTRC?

A:  You can browse contributed code on our GitHub page:

Q7: To whom can I direct technical questions?

A: Please email HTRC support:

Q8:  How do I report issues or give feedback?

A: We welcome your feedback! You can send an email to HTRC Support at We track support requests in using JIRA, and you can log-in to see your requests and our responses here:


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