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Web Archiving Project
Japan's National Diet Library Web Archiving Project regularly collects and preserves websites published in Japan.
About Web Archiving Project
The NDL Web Archiving Project (WARP), operated by Japan's National Diet Library, regularly collects and preserves websites published in Japan so content that is frequently updated or may disappear remains available.
Users can search archived content and browse collections by organization and by theme, such as events, online periodicals, and obsolete websites of defunct municipalities. Websites covered by the National Diet Library Law are archived under that law, while other sites are preserved and released only with permission from the publishers.
Key features
- Search archived websites by keyword, URL, or example topics
- Browse collections by organization type
- Browse theme collections including KAKENHI and defunct municipalities
- View newly archived and defunct website highlights with dates
- Explain web archiving mechanism and global web archives
- Provide data analysis case studies using archived content
Best for: Researchers and members of the public who need access to preserved Japanese government, academic, and organizational websites.
Good for
- Preserves websites that are frequently updated or may disappear
- Organizes archives by organization type and by theme
- Includes statutory collections and permitted sites such as political parties and disaster-related pages
Watch out for
- Websites outside the National Diet Library Law are included only with publisher permission
- Browsing and searching are unavailable during scheduled maintenance from 9:00 a.m. JST Friday, October 9 to 8:00 p.m. JST Tuesday, October 13
Web Archiving Project at a glance
- Website
- warp.ndl.go.jp?_lang=ja
- Category
- Research & Data › Academic Search
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- Japanese
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Web Archiving Project alternatives
Tools and sites you could use instead, ranked by how closely they match.
Japan’s ISSN National Centre, run by the National Diet Library, provides information about ISSN registration.
Search the National Diet Library catalog and request materials or locate copies held by libraries across Japan.
The Martynas Mažvydas National Library of Lithuania collects and preserves written Lithuanian cultural heritage.
ΣStar is Keio University’s Science and Technology Media Center repository that collects, preserves and shares digitized research and teaching materials from the Faculty and Graduate School of Science and Technology.
Japan’s National Institute of Informatics dataset center shares datasets and related research papers.
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AIT Associated Repository of Academic Resourcesrepository.aitech.ac.jp/dspace/index.jsp?local…Project Ben-Yehudabenyehuda.orgAI Calabriaai.calabria.itResearch Squareresearchsquare.comIndigenous Systemsindigenoussystems.orgnumelyonumelyo.bm-lyon.fr
Web Archiving Project FAQ
What types of websites does WARP target?
Websites of national institutions, local governments, local public corporations, independent administrative agencies, special corporations, and national, prefectural and other public universities under the National Diet Library Law, plus other sites such as private universities, political parties, events, and disaster-related sites with publisher permission.
Why does the National Diet Library archive websites?
Because internet information is updated frequently and may disappear quickly, and materials such as reports from public agencies have shifted from paper to the internet.
Is there scheduled downtime for using archived content?
Yes. Browsing of or searching for archived content and related collection pages will be unavailable from 9:00 a.m. JST Friday, October 9 to 8:00 p.m. JST Tuesday, October 13 due to system maintenance.
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