I need multi language web based OCR for my Google Chrome extension

I am creating a google Chrome Extension. And I need multi language OCR for that extension. I need the OCR web based. The flow of the extension is take screenshot convert it in to base64 and push on the online API. The API will get the request validate the sender and get the text out of the posted image and in response send the text. The extension will copy it on clipboard. I need complete multi language OCR to host on the Linux vps. I will write the API the api will communicate with the OCR on server and send response via API to extension.

I only need the multi language OCR. Apart from that I need some sort of setup to train the dataset in order to improve the efficiency of the OCR.