TypeError [ERR_INVALID_ARG_TYPE]: The "cb" argument must be of type function. Received undefined about pdf2json HOT 3 CLOSED

"fs.writeFileSync("./test/bnr_01.json", JSON.stringify(pdfData));" you can edit the code in this way.

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This is an error in the docs of this library. fs.writeFile expects a callback and because you are not passing it, it throws an error. To fix this issue you need to define your above function like this:
fs.writeFile("./test/bnr_01.json", JSON.stringify(pdfData), (data) => { console.log(data)})
Replace your fs.writeFile line with the above and your code will work.

from pdf2json.

this error coming when you forget a callback function .
eg
fs.unlink('./image.jpg') error
fs.unlink('./imgae',(err)=>{console.log(err)}) This is right way

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