Convert ZPL (Base64) in image (PNG)

I need to convert a ZPL file into an image. I already use the labelary web service, but I need a solution that is less dependent on an external application.

I am proceeding in the following way. I'm getting the base64 encoded part: eJzs281u4zYQAGAKLMCewmsPhfgaPWipPtIeVUC1GPiQYx6hr9FDgdL....rest of the code (Z64 encoded), which would be the image of the ZPL file, and I'm trying to convert this to a png image. I tried using the code below, but I get this error: Error: Could not find MIME for Buffer

const fs = require('fs');
var base64Img = require('base64-img');
var Jimp = require('jimp');

try{
    var data = fs.readFileSync('./test.zpl', 'base64')
} catch (err) {
    console.log(err);
}

var buffer = Buffer.from(data, 'base64');

Jimp.read(buffer).then(res => {
    return res
    .quality(50)
    .rotate(90)
    .resize(250,250)
    .writeAsync('out.png');
}).catch(err => {
    console.log(err);
});

I tried using this method too, but it generates a png image, but it cannot be processed by the image viewer.

const fs = require('fs');
var base64Img = require('base64-img');

try{
    var data = fs.readFileSync('./test.zpl', 'base64')
} catch (err) {
    console.log(err);
}

var buffer = Buffer.from(data, 'base64');

fs.writeFileSync("./out.png", buffer);

Grateful.

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