- 1 year ago
unknown error trying to fs.readfilesync files with more than 120MB
If you are encountering an error when using fs.readFileSync
in Node.js to read files larger than 120MB, it is likely due to memory limitations. Reading such large files synchronously can consume a significant amount of memory and may exceed the default memory limits in Node.js.
To overcome this issue, you can consider reading the file in chunks or asynchronously to reduce memory usage. Here's an example of reading a file asynchronously in chunks:
javascriptconst fs = require('fs');
function readFileChunks(filePath, chunkSize) {
return new Promise((resolve, reject) => {
const chunks = [];
const stream = fs.createReadStream(filePath, { highWaterMark: chunkSize });
stream.on('data', (chunk) => {
chunks.push(chunk);
});
stream.on('error', (error) => {
reject(error);
});
stream.on('end', () => {
const fileData = Buffer.concat(chunks);
resolve(fileData);
});
});
}
// Example usage
const filePath = 'path/to/large/file';
const chunkSize = 1024 * 1024; // 1MB chunk size
readFileChunks(filePath, chunkSize)
.then((fileData) => {
// Process the file data as needed
console.log('File size:', fileData.length);
})
.catch((error) => {
console.error('Error reading file:', error);
});
In this example, the readFileChunks
function reads the file asynchronously in chunks. The highWaterMark
option is set to the desired chunk size (1MB in this case), which controls the amount of data read at a time. As each chunk is read, it is appended to an array of chunks.
Once the entire file has been read, the chunks are concatenated using Buffer.concat
, and the resulting file data is resolved as a Buffer
.
By reading the file asynchronously in smaller chunks, you can mitigate memory issues when dealing with large files. Adjust the chunkSize
according to your specific requirements and available memory.
Remember to handle any errors that may occur during the file read operation.
Feel free to modify the code to suit your needs or incorporate it into your application as necessary.