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Node.js - save JSON in file

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Created by:
chelsea
806

In this article, we would like to show you how to save JSON in file using Node.js.

Quick solution:

Note:

This solution replaces the example.txt file contents if it already exists.

 

Additional arguments - flags

Edit

In this section, we present how to modify the quick solution from previous section by specifying an additional argument (flag) in fs.writeFile().

FlagDescription
r+
  • open the file for reading and writing
a
  • open the file for writing
  • positioning the stream at the end of the file
  • the file will be created if it doesn't exist
a+
  • open the file for reading and writing
  • positioning the stream at the end of the file
  • the file will be created if it doesn't exist
w+
  • open the file for reading and writing
  • positioning the stream at the beginning of the file
  • the file will be created if it doesn't exist

Practical example:

Note:

Now when you run the program, the data string will be added at the end of example.txt file (but not in the separate line).

Alternative solution

Edit

In this example, we use fs.writeFileSync() as an alternative solution to fs.writeFile(). The API also replaces the contents of the file if it does already exist.

References

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