Reading binary data in node.js

The ‘binary’ encoding is an alias for ‘latin1′, which you clearly don’t want when reading non-character data. If you want the raw data, don’t specify an encoding at all (or supply null)*. You’ll get a Buffer instead of a string, which you’d then want to use directly rather than using toString on it. * (Some … Read more

Express – Return binary data from webservice

Here is my slightly cleaned up version of how to return binary files with Express. I assume that the data is in an object that can be declared as binary and has a length: exports.download = function (data, filename, mimetype, res) { res.writeHead(200, { ‘Content-Type’: mimetype, ‘Content-disposition’: ‘attachment;filename=” + filename, “Content-Length’: data.length }); res.end(Buffer.from(data, ‘binary’)); … Read more

Writing binary data using node.js fs.writeFile to create an image file

JavaScript language had no mechanism for reading or manipulating streams of binary data. The Buffer class was introduced as part of the Node.js API to make it possible to interact with octet streams in the context of things like TCP streams and file system operations. Pure JavaScript, while great with Unicode encoded strings, does not … Read more

How to read/write a binary file?

Reading and writing binary files is pretty much the same as any other file, the only difference is how you open it: unsigned char buffer[10]; FILE *ptr; ptr = fopen(“test.bin”,”rb”); // r for read, b for binary fread(buffer,sizeof(buffer),1,ptr); // read 10 bytes to our buffer You said you can read it, but it’s not outputting … Read more