How to run scripts in After effects without running it manually.

You can check out Plainly Videos (https://plainlyvideos.com).

Basically you would upload an After Effects project to Plainly web-app and then you can select which compositions you want to render and if you want to change any specific layer property. For example, you can select to change texts, images, colors, control values, etc. And then when subbmitting a render, you would provide parameters as JSON.

The good thing is the autiomation support. You can connect Plainly  to a bunch of tools, so you can completly avoid triggering renders manually as you descibed.

Hi there! 👋

Not sure if this will help, but you can use Templater from Dataclay to achieve this.  Specifically you can use Templater Pro or Templater Bot editions.

You can have your JSON file be an array of objects where each has a "target" property key that specifies which project composition you want AE to render out automatically.  This "target" property key's

value specifies the composition by name.  Then, when processing the JSON file, Templater will process that specific composition to be rendered out.

You can learn more about it at https://dataclay.com/templater