CTA - Chicago Transit Authority
Developer Center

 Developer Center

Welcome, developers!

We’re glad you’re interested in developing applications using data from CTA. This set of data offerings will be able to help you create interesting new applications and mash-ups that’ll help people get the information they want or need about CTA services, wherever they want to receive it.

The information provided through data feeds includes static schedule and service data using an open standard, and APIs that can get you up-to-the-minute information from both CTA Bus Tracker SM and CTA Train Tracker SM. We also have a Customer Alerts API that is a feed of both planned and unplanned events that affect service, as published on transitchicago.com.

What's new

We've published JSON versions of our Train Tracker API, Bus Tracker API and Customer Alerts API endpoints! (Previously, all our feeds were only available in an XML format, only.)

You can find information for each API for how to query for a JSON response in the documentation for each family of APIs.


Send us feedback

We'll continually be working to improve the available tools and content, and we'd love to hear what you think. Drop us a line at webmaster@transitchicago.com.


Transit App Center

Looking for apps? Find them in the App Center!

Want your app listed? If you've developed an application (whether for mobile devices, on the Web or in a public space), tell us about it and we'll consider showcasing it.


Terms of use

To use any of CTA’s APIs or data offerings in  your own applications, you’ll need to agree to our Developer License Agreement and Terms of Use. Also, see our CTA Trademarks & You section to help understand what you can and can't do with CTA marks under this agreement.


What’s available


More information

While we provide the data and maintain the sources, we’re not able to provide support directly in how to write your software. We do, however, provide some pointers and tips to help get you started. There are also some helpful resources online, which we're happy to point you to.

Further reading and help...


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Phone: 1-888-YOUR-CTATTY: 1-888-CTA-TTY1Website: transitchicago.com