Node.js, MongoDB, and AngularJS Web Development

Opening and Closing Files

Node.js provides synchronous and asynchronous methods for opening files. Once a file is opened, you can read data from it or write data to it, depending on the flags used to open the file. To open files in a Node.js app, use one of the following statements for asynchronous or synchronous:

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fs.open(path, flags, [mode], callback)fs.openSync(path, flags, [mode])

The path parameter specifies a standard path string for your file system. The flags parameter specifies what mode to open the file in—read, write, append, etc., as described in Table 6.1. The optional mode parameter sets the file access mode and defaults to 0666, which is readable and writable.

Table 6.1 Flags that define how files ...