PayloadTooLargeError: request entity too large when uploading ATF

Uploading changes to the ATF of e.g. P497998 is currently not possible due to a PayloadTooLargeError, presumably in jtf-lib (but if not, at least in an Express.js/Node.js server).

PayloadTooLargeError: request entity too large
    at readStream (/var/app/node_modules/raw-body/index.js:155:17)
    at getRawBody (/var/app/node_modules/raw-body/index.js:108:12)
    at read (/var/app/node_modules/body-parser/lib/read.js:77:3)
    at jsonParser (/var/app/node_modules/body-parser/lib/types/json.js:135:5)
    at Layer.handle [as handle_request] (/var/app/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/var/app/node_modules/express/lib/router/index.js:317:13)
    at /var/app/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/var/app/node_modules/express/lib/router/index.js:335:12)
    at next (/var/app/node_modules/express/lib/router/index.js:275:10)
    at expressInit (/var/app/node_modules/express/lib/middleware/init.js:40:5)