Is there any API for converting .indd to .idml files and vice versa?

[aparna_6212]

Currently, I convert .indd to .idml manually using Adobe InDesign (File → Save As → Choose file format type -> choose the location → save).

Can this process be automated via an API so it run without requiring Adobe InDesign to be installed? Is there any official API available for this?

[Kasyan Servetsky]

It's possible to do by scripts but only from InDesign.

• See here 
  Export to IDML
  Resave in the current version

for  the Batch processor script

[Lawrence Horwitz]

It's not practically feasible to do this without InDesign. There are online services that allow you to run scripts against hosted InDesign Server instances that would enable you to do this. Two that I know of are from Adobe themselves and from Typefi. Adobe's solution is geared towards enterprise customers, while Typefi's is aimed at all levels of customer.

Adobe:
https://developer.adobe.com/firefly-services/docs/indesign-apis/

Typefi:
https://runscript.typefi.com/