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Write to a file only if it does not exist
can i create .json file using this module?
Checking if a file exists and then, if not, writing to it is an anti-pattern because it introduces a very real possibility of race conditions.
I would look into using the O_EXCL
flag instead. When opening a file for writing in exclusive mode, it will fail if the file already exists. In Node that flag is used by passing an extra x
to the flag
parameter.
The error returned if the file exists will be EEXIST
(check err.code === 'EEXIST'
).
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