Japan Legal Database Search

Search Japanese legal databases programmatically using the SIP API. This Apify Actor provides automated access to Japan's key legal information systems, enabling researchers, legal professionals, and developers to query official Japanese law datasets and intellectual property court records at scale.

Overview

Japan's legal landscape is vast and complex, spanning thousands of statutes, regulations, and court decisions published across multiple government portals. Accessing this information manually is time-consuming and often requires navigating Japanese-language interfaces. The Japan Legal Database Search Actor solves this problem by providing a unified, keyword-based search interface across two critical Japanese legal data products.

Whether you are conducting Japan legal search for compliance research, monitoring changes in Japanese IP court rulings, or building a Japan law database for your organization, this Actor streamlines the entire data collection process.

Supported Data Sources

e-Gov Law & Justice Dataset (egov_legal)

The e-Gov Legal Open Data Catalog is Japan's official electronic government portal for laws and regulations. This source searches the jp_egov_legal_opendata_catalog product, which indexes legislative and regulatory documents published through Japan's e-Gov system. It covers statutes, cabinet orders, ministerial ordinances, and other legal instruments maintained by Japanese government agencies.

Use this source when you need to search Japanese legislation, find specific laws by keyword, or build a comprehensive Japan law database covering regulatory and statutory content. The dataset is particularly valuable for compliance teams tracking regulatory changes in Japan and legal researchers studying Japanese legislative history.

IP High Court English Links (ip_court)

The IP High Court English Portal Links source searches the jp_ip_high_court_english_links product, providing access to English-language resources from Japan's Intellectual Property High Court. This specialized court handles appeals in patent, trademark, design, and other IP-related cases, making it one of the most important judicial bodies for international IP practitioners.

This source is essential for anyone conducting Japanese IP court research, monitoring patent litigation outcomes in Japan, or tracking how Japan's IP High Court interprets intellectual property law. The English-language links make this data accessible to international legal teams without requiring Japanese language proficiency.

Input Configuration

The Actor accepts the following input parameters:

• keyword (required, string): The search term to query across selected databases. This is the primary search parameter used to find relevant legal documents and records. For best results with Japan legal search, use specific legal terms, statute numbers, or case-related keywords. Default prefill value is "patent".

• sources (optional, array): Select which legal databases to search. Options are egov_legal for the e-Gov Law & Justice Dataset and ip_court for IP High Court English Links. When left at the default, both sources are searched, giving you comprehensive coverage across Japan's legal information systems.

• maxResults (optional, integer): Maximum number of results to retrieve per source. Defaults to 50, with a maximum of 200. Increase this value when you need thorough coverage of a broad search term, or keep it low for targeted queries where only the most relevant results matter.

Output Format

Results are stored in the default Apify dataset. Each record includes:

• source: The source key (egov_legal or ip_court) identifying which database produced the result.
• product_id: The full SIP API product identifier for traceability.
• Additional fields returned by the SIP API for each matching record, which vary by data source.

You can export results in JSON, CSV, XML, or other formats supported by the Apify platform. The structured output makes it straightforward to integrate Japan legal search results into downstream workflows, databases, or analysis pipelines.

Use Cases

Legal Research and Compliance

Law firms and corporate legal departments use this Actor to monitor Japanese regulatory changes, search for specific statutes, and maintain up-to-date Japan law database records. By automating the search process, teams can track legislative developments without manually checking government portals.

Intellectual Property Monitoring

IP professionals and patent attorneys rely on the IP High Court English Links source to stay informed about Japanese IP court decisions. Monitoring Japanese IP court rulings is critical for companies with patent portfolios in Japan, as court interpretations directly affect patent validity and enforcement strategies.

Academic Research

Researchers studying Japanese law, comparative legal systems, or East Asian IP policy use this Actor to collect structured data from official Japanese legal sources. The ability to search across multiple databases with a single query significantly accelerates the literature review and data collection phases of academic projects.

Data Integration and Analytics

Development teams building legal technology products integrate this Actor into their data pipelines to continuously ingest Japanese legal data. The structured JSON output feeds directly into databases, search indexes, and analytics platforms, enabling real-time Japan legal search capabilities within custom applications.

Setup and Authentication

This Actor requires a valid SIP API key for authentication. Set the SIP_API_KEY environment variable in your Apify Actor configuration with your API key. The key is passed to the SIP API via the X-API-Key header on every request.

To obtain an API key, register with the SIP data platform and request access to the Japanese legal data products.

Technical Details

• Built with Python 3.13 and async HTTP requests via httpx for fast, concurrent API calls.
• Uses the Apify SDK v2 for seamless integration with the Apify platform.
• Each data source is queried independently, so a failure in one source does not block results from others.
• HTTP errors and network failures are caught and logged without crashing the Actor, ensuring partial results are always saved.

Limitations

• Search results depend on the SIP API's indexing and relevance ranking. The Actor passes your keyword directly to the API and returns results as-is.
• The e-Gov dataset primarily contains Japanese-language content. While the IP High Court source provides English links, full-text translations of Japanese statutes are not included.
• API rate limits and quotas are determined by your SIP API subscription tier.

Keywords

Japan legal search, Japanese law database, Japan law database, Japanese IP court, IP High Court Japan, e-Gov Japan law, Japanese legal research, Japan patent court, Japanese legislation search, SIP API legal data, Japan regulatory compliance, Japanese intellectual property court decisions, Japan legal data scraping, Apify Japan legal Actor

Use as MCP Tool (AI Agent Integration)

This Actor works as an MCP tool — AI agents (Claude, GPT, Cursor) can discover and run it automatically.

Quick setup (Claude Desktop / Cursor / VS Code)

Add to your MCP config:

{
  "mcpServers": {
    "apify": {
      "url": "https://mcp.apify.com",
      "headers": {
        "Authorization": "Bearer YOUR_APIFY_TOKEN"
      }
    }
  }
}

Then ask your AI: "Search for patent infringement in Japanese legal databases"

Direct API call

from apify_client import ApifyClient
client = ApifyClient("YOUR_APIFY_TOKEN")
run = client.actor("lentic_clockss/japan-legal-search").call(
    run_input={"searchTerms": ["patent"], "maxResultsPerSource": 50}
)
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

Other Data API Actors

• US Federal Law & Regulation API
• EU Legal & Procurement Data API
• UK Government Data API