Error while opening multiple json files in R

I am very new to r and json. And I am trying to read multiple json files located in one folder using R

filenames <- list.files("./data/1st-transcripts",
                         pattern="*.json", full.names=TRUE)
ldf <- lapply(filenames, fromJSON)

But while running the above code, I am getting following error

Error in parse_con(txt, bigint_as_char) : parse error: trailing garbage
           true, "__ts": 1662058422212}{"_id": "6310f7d09e646801f2ca0a
                     (right here) ------^

I tried using stream_in(file(path)) and readLines() but it doesn't work. How can I fix this error?

I will really appreciate any help or suggestion