Writing JSON object to a JSON file with fs.writeFileSync Ask Question

I am trying to write a JSON object to a JSON file. The code executes without errors, but instead of the content of the object been written, all that gets written into the JSON file is:

[object Object]

This is the code that actually does the writing:

fs.writeFileSync('../data/phraseFreqs.json', output)

'output' is a JSON object, and the file already exists. Please let me know if more information is required.