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How to use the close function from fs

Find comprehensive JavaScript fs.close code examples handpicked from public code repositorys.

fs.close is a method in the Node.js File System module used to close an open file descriptor.

fs.md?plain=1

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```js
const fs = require('fs');

fs.open('/open/some/file.txt', 'r', (err, fd) => {
  if (err) throw err;
  fs.close(fd, (err) => {
    if (err) throw err;
  });
});
```

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+ 5 other calls in file

btrfs.js

GitHub: wisnuc/appifi

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    try {
      ioctl(dstFd, 0x40049409, srcFd)      
    } catch (e) {
      error = e 
    }
    fs.close(dstFd, () => {})
  }
  fs.close(srcFd, () => {})
  callback(err)
}))

+ 5 other calls in file

How does fs.close work?

fs.close is a method provided by the Node.js File System (fs) module used to close an open file descriptor. When fs.close is called with a file descriptor and an optional callback function, it releases the underlying resources associated with the open file descriptor, such as file locks or buffers, and closes the file. Once the file is closed, it can no longer be read from or written to. The function works by first performing any necessary cleanup operations associated with the file descriptor, such as flushing buffers or releasing locks. It then closes the file descriptor and returns an error or success message to the callback function if one is provided. fs.close is typically used in conjunction with other file system methods such as fs.open or fs.createReadStream to ensure that files are properly closed and resources are released when they are no longer needed. By providing a simple and consistent interface for closing open file descriptors, fs.close helps ensure the efficient and reliable operation of Node.js applications that work with the file system.

createBigFile.js

GitHub: wisnuc/appifi

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ws.on('finish', () => {
  if (error) return
  fs.open(filePath, 'r+', (err, fd) => {
    if (err) return callback(err)
    fs.ftruncate(fd, size, err => {
      fs.close(fd, x => x)
      if (err) {
        return callback(err)
      } else {
        return callback(null)

test-fs-chmod.js

GitHub: alibaba/AliOS-nodejs

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// get closed once they're opened.
fs._open = fs.open;
fs._openSync = fs.openSync;
fs.open = open;
fs.openSync = openSync;
fs._close = fs.close;
fs._closeSync = fs.closeSync;
fs.close = close;
fs.closeSync = closeSync;

Ai Example

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const fs = require("fs");

// Open a file and get the file descriptor
const fd = fs.openSync("myfile.txt", "r");

// Read data from the file
const data = fs.readFileSync(fd, "utf8");
console.log(data);

// Close the file descriptor
fs.closeSync(fd);

In this example, we first import the Node.js File System (fs) module. We then open a file using the fs.openSync method and read data from the file using the fs.readFileSync method. Once we're done reading from the file, we use the fs.closeSync method to close the open file descriptor and release any resources associated with it. By using fs.close, we ensure that the file is properly closed and that any resources associated with it are released, preventing memory leaks and other issues that can arise when files are left open for extended periods of time.

test-fs-error-messages.js

GitHub: nwjs/node

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  assert.strictEqual(err.syscall, 'close');
  return true;
};

common.runWithInvalidFD((fd) => {
  fs.close(fd, common.mustCall(validateError));

  assert.throws(
    () => fs.closeSync(fd),
    validateError

test-fs-truncate.js

GitHub: grangerecords/anyka

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    fs.ftruncate(fd, function(er) {
      if (er) return cb(er);
      fs.stat(filename, function(er, stat) {
        if (er) return cb(er);
        assert.equal(stat.size, 0);
        fs.close(fd, cb);
      });
    });
  });
});

AppSrvRpt.js

GitHub: apHarmony/jsharmony

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if (tmperr) throw tmperr;
var reportFunc = (model.format == 'xlsx' ? _this.genReportXlsx : _this.genReportPdf);
reportFunc.call(_this, req, res, fullmodelid, params, data, tmppath, function(err, rsltpath){
  if(err) return done(err, null);
  var dispose = function (disposedone) {
    fs.close(tmpfd, function () {
      fs.unlink(rsltpath, function (err) {
        fs.unlink(tmppath, function (err) {
          if (disposedone) disposedone();
        });

00005-nodejs-file-system.md?plain=1

GitHub: ddean2009/www.flydean.com

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* fs.access(): 检查文件是否存在，以及 Node.js 是否有权限访问。
* fs.appendFile(): 追加数据到文件。如果文件不存在，则创建文件。
* fs.chmod(): 更改文件（通过传入的文件名指定）的权限。相关方法：fs.lchmod()、fs.fchmod()。
* fs.chown(): 更改文件（通过传入的文件名指定）的所有者和群组。相关方法：fs.fchown()、fs.lchown()。
* fs.close(): 关闭文件描述符。
* fs.copyFile(): 拷贝文件。
* fs.createReadStream(): 创建可读的文件流。
* fs.createWriteStream(): 创建可写的文件流。
* fs.link(): 新建指向文件的硬链接。

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+ 5 other calls in file

unpack.js

GitHub: zeeoneofficial/node_modules

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  mode: mode,
  autoClose: false
})
stream.on('error', er => {
  if (stream.fd)
    fs.close(stream.fd, () => {})

  // flush all the data out so that we aren't left hanging
  // if the error wasn't actually fatal.  otherwise the parse
  // is blocked, and we never proceed.

+ 2 other calls in file

create-app.cjs

GitHub: Tracktor/create-boilerplate-vite-react-ts

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  const fd = openSync(file, "w+");
  const data = getAppData();
  const buffer = Buffer.from(data);


  writeSync(fd, buffer, 0, buffer.length, 0); //write new data
  close(fd);
};


const installDependencies = () => {
  // remove lock file before install, user don't need it

main.js

GitHub: ghostpariah/thunder-canyon

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        });
        if (win) {
            //win.webContents.send('whiteboard-updated')
        }
    }
    // fs.close()
});


/**************
 * communication involving job

index.js

GitHub: Monuwarhussen/CSE---3200-project

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  return super.emit(ev, data)
}

close () {
  if (typeof this.fd === 'number' && this.closeAfter)
    fs.close(this.fd, () => {})
}

open () {
  fs.open(this.path, this.oflags, (er, fd) => this.onopen(er, fd))

+ 2 other calls in file

tmp.js

GitHub: ds-sampaio/ClicouChegouApp

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// create and open the file
fs.open(name, CREATE_FLAGS, opts.mode || FILE_MODE, function _fileCreated(err, fd) {
  if (err) return cb(err);

  if (opts.discardDescriptor) {
    return fs.close(fd, function _discardCallback(err) {
      if (err) {
        // Low probability, and the file exists, so this could be
        // ignored.  If it isn't we certainly need to unlink the
        // file, and if that fails too its error is more

replace.js

GitHub: RumanSanghera/Receipt-Scanner

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const p = new Pack(opt)

const getPos = (fd, size, cb_) => {
  const cb = (er, pos) => {
    if (er) {
      fs.close(fd, _ => cb_(er))
    } else {
      cb_(null, pos)
    }
  }

+ 3 other calls in file

02_%E6%96%87%E4%BB%B6%E6%8F%8F%E8%BF%B0%E7%AC%A6.js

GitHub: xueguanghui-cloud/Node_Learn

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  } catch (err) {
    console.log('读取文件信息失败！');
  }


  // 手动关闭文件
  fs.close(fd);
});

test-fs-largefile.js

GitHub: Mike7323/Mike-s-construction

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  fs.readSync(fd, readBuf, 0, 1, 0);
  assert.strictEqual(readBuf[0], 0);


  // Verify that floating point positions do not throw.
  fs.writeSync(fd, writeBuf, 0, writeBuf.length, 42.000001);
  fs.close(fd, common.mustCall());
} catch (e) {
  if (e.code !== 'ENOSPC') {
    throw e;
  }

data.js

GitHub: hridoyraisul/RAW-NODE-JS-PROJECT

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fs.open(lib.basedir+dir+'/'+file+'.json','wx',(createError, fileDescriptor) => {
    if (!createError && fileDescriptor){
        const stringData = JSON.stringify(data);
        fs.writeFile(fileDescriptor, stringData,(writingError) => {
            if (!writingError){
                fs.close(fileDescriptor,(closingError) => {
                    if (!closingError){
                        callback(false)
                    } else {
                        callback('File closing failed!');

data.js

GitHub: AlessandroMarc/nodejs-masterclass

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fs.ftruncate(fileDescriptor, function(err) {
  if (!err) {
    // Write to file and close it
    fs.writeFile(fileDescriptor, stringData, function(err) {
      if (!err) {
        fs.close(fileDescriptor, function(err) {
          if (!err) {
            callback(false);
          } else {
            callback('Error closing existing file');

data.js

GitHub: protickr/raw-nodejs-project

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const stringData = JSON.stringify(data);

// write data to file and then close it 
fs.writeFile(fileDescriptor, stringData, function(err2){
    if(!err2){
        fs.close(fileDescriptor, function(err3){
            if(!err3){
                callback(false);
            } else {
                callback('Error closing the new file!');

data.js

GitHub: icaromagnago/pizza-delivery-nodejs-api

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// Truncate the file
fs.ftruncate(fileDescriptor, (err) => {
  if (!err) {
    fs.writeFile(fileDescriptor, stringData, (err) => {
      if (!err) {
        fs.close(fileDescriptor, (err) => {
          if (!err) {
            callback(false);
          } else {
            callback('Error closing existing file');

Other functions in fs

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fs.readFileSync is the most popular function in fs (2736 examples)

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