check if images exist in the folder

app.head("/uploads/:image", (req, res) => {
fs.access(
path.join(__dirname, "uploads", req.params.image),
fs.constants.R_OK ,
(err) => {
res.status(err ? 404 : 200);
res.end();
}
);
});

create uploads folder

curl -X POST -H 'Content-Type: image/png' \
- data-binary @example.png \
http://localhost:3000/uploads/example.png

image sharp

let image = sharp({
create : {
width : width,
height : height,
channels : 4,
background : { r: 0, g: 0, b: 0 },
}
});

imagini.js

const express = require("express");
const sharp = require("sharp");
const app = express();
app.get(/\/thumbnail\.(jpg|png)/, (req, res, next) => {
let format = (req.params[0] == "png" ? "png" : "jpeg");
let width = 300;
let height = 200;
let border = 5;
let bgcolor = "#fcfcfc";
let fgcolor = "#ddd";
let textcolor = "#aaa";
let textsize = 24;
let image = sharp({
create : {
width : width,
height : height,
channels : 4,
background : { r: 0, g: 0, b: 0 },
}
});
const thumbnail = new Buffer(
`<svg width="${width}"height="${height}">
<rect
x="0"y="0"
width="${width}"height="${height}"
fill="${fgcolor}"/>
<rect
x="${border}"y="${border}"
width="${width - border * 2}"height="${height - border * 2}"
fill="${bgcolor}"/>
<line
x1="${border * 2}"y1="${border * 2}"
x2="${width - border * 2}"y2="${height - border * 2}"
stroke-width="${border}"stroke="${fgcolor}"/>
<line
x1="${width - border * 2}"y1="${border * 2}"
x2="${border * 2}"y2="${height - border * 2}"
stroke-width="${border}"stroke="${fgcolor}"/>
<rect
x="${border}"y="${(height - textsize) / 2}"
width="${width - border * 2}"height="${textsize}"
fill="${bgcolor}"/>
<text
x="${width / 2}"y="${height / 2}"dy="8"
font-family="Helvetica"font-size="${textsize}"
fill="${textcolor}"text-anchor="middle">${width} x ${height}</text>
</svg>`
);
image.overlayWith(thumbnail)[format]().pipe(res);
});
app.listen(3000, () => {
console.log("ready");
});

Initialize

app.listen(3000, () => {
console.log("ready");
});

new parameters to imagini.js

let width = +req.query.width || 300;
let height = +req.query.height || 200;
let border = +req.query.border || 5;
let bgcolor = req.query.bgcolor || "#fcfcfc";
let fgcolor = req.query.fgcolor || "#ddd";
let textcolor = req.query.textcolor || "#aaa";
let textsize = +req.query.textsize || 24;

upload image function

app.post("/uploads/:image", bodyparser.raw({
limit : "10mb",
type : "image/*"
}), (req, res) => {
let image = req.params.image.toLowerCase();
if (!image.match(/\.(png|jpg)$/)) {
return res.status(403).end();
}
let len = req.body.length;
let fd = fs.createWriteStream(path.join(__dirname, "uploads",
image), {
flags : "w+",
encoding : "binary"
});
fd.write(req.body);
fd.end();
fd.on("close", () => {
res.send({ status : "ok", size: len });
});
});

uploading image

//parser module
npm install body-parser - save
//other core modules
const bodyparser = require("body-parser");
const path = require("path");
const fs = require("fs");