What is the difference between Ignition Web Development Module and Sepasoft Web Services Module?

Are the two module the same in functionality or there is an advantage
for each use?

If my main purpose is to extract from an external web server, which
one should I use?

Or is it an overkill to install both module?

IA’s WebDev module is about exposing Ignition’s web server to other tools, primarily by allowing you to code arbitrary endpoints with custom Python handlers for different HTTP verbs.

Sepasoft’s Web Services module does that itself, and has tools to connect to other web services to better retrieve data.

For your purposes, I think Sepasoft’s module is worth considering, and the Webdev module is probably not necessary.

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Great. Thanks for clarification!