CODEWITHSUNDEEP
node.jsimage-processingsharp
Shan
Shan

Reputation: 310

Can I directly process buffer data using Sharp in NodeJs

I get buffer data to my program from external and I want to process buffer data and send it as a buffer also. So I don't want to convert buffer into an image. How can I do this?

I try this way but it not work.

const process = await sharp(incoming_buffer_data).grayscale();

fs.writeFileSync('test.jpg', process); // I am using this for testing. Allways I am getting worng image format as an error

Upvotes: 6

Views: 12892

Answers (2)

CrackerKSR
CrackerKSR

Reputation: 1917

Working snippet.

sharp(buffer)
  .greyscale()
  .toFile('file.png', (err, info) => {
    // file is stored as file.png in current directory
})

You can even do other thing as well like resizing

sharp(buffer)
  .greyscale()
  .resize(512,512,{fit:'contain'})
  .toFile('file.png', (err, info) => {
    // file is stored as file.png in current directory
})

Upvotes: 0

thammada.ts
thammada.ts

Reputation: 5245

Assuming incoming_buffer_data is indeed a buffer and has a supported image format.

You can either get the output as buffer, and send it to fs.writeFileSync() like you tried to do

const buffer = await sharp(incoming_buffer_data).grayscale().toBuffer();
fs.writeFileSync('test.jpg', buffer);

Or you can write it to a file directly

await sharp(incoming_buffer_data).grayscale().toFile('test.jpg');

Upvotes: 9

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