Then you might be interested in my application that I posted here the other day. It's mainly a GUI application for power users, but it also has a console application so you can integrate it into your workflow. The JSON support I had added as an additional feature, but to my knowledge it is not used by anyone yet (at least I had no support mails about it). Oh, and it works without cloud and can be used completely offline (after one-time online activation, if you want to remove the demo watermark).
I am running on python and AWS Lambda. Works really smooth battle tested it with 100 pdf pages and 400 fields to be merged and the Pdf is generated within 2 seconds.
And I am currently using one of the lowest resource settings on AWS Lambda.
I am mostly using pikepdf and the a lot of secret sauce added ;)
Yes I still have problems with the activation mail. Need to fix this, currently rely on my own SMTP which is not a good idea. Should move to a service.
I'm getting a variety of CORS errors in console. Maybe this helps:
```
Access to XMLHttpRequest at 'https://api.doqs.dev/v1/organization' from origin 'https://app.doqs.dev' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
```
