Transport for Chicago, US
APIFree API for Chicago Transit Authority (CTA) transit data
Overview
The Transport for Chicago API provides real-time and static data for Chicago's CTA buses and trains. Key endpoints include real-time arrival predictions (/ttarrivals), service alerts (/alerts), route details (/routes), and stop information (/stops). Responses are formatted in JSON. Use cases include building commuter apps with live arrival times, integrating transit alerts into navigation tools, creating stop-specific notifications, and analyzing transit patterns for urban planning.
Example Integration (JavaScript)
fetch('http://www.transitchicago.com/developers/')
.then(res => res.json())
.then(data => console.log(data))
.catch(err => console.error(err)); Key Features
- RESTful
- JSON support
- Real-time transit data
- Bus and rail coverage
- Service alerts access
Frequently Asked Questions
? Is Transport for Chicago API free to use?
Yes, the API is free for public use, but you need to register for an API key to access it.
? Does it require an API Key?
Yes, registration on the CTA Developers page is mandatory to get a free API key for authentication.
? What is the response format?
All API responses are in JSON format, which is widely compatible with web and mobile applications.
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Tool Info
Pros
- ⊕ Free access to real-time data
- ⊕ Covers both bus and rail systems
Cons
- ⊖ Requires API key registration
- ⊖ Rate limits apply