In this publication we will see the main methods to use with Azure Blob Storage this example was intended using Express JS
npm i @azure/storage-blob dotenv
Blob Service Client
import { BlobServiceClient } from "@azure/storage-blob";
import { config } from "dotenv";
config();
const blobService = BlobServiceClient.fromConnectionString(
process.env.AZURE_STORAGE_CONNECTION_STRING
);
Connection String
Methods for blobs (Files)
Upload Blob
export const uploadBlob = async (req, res) => {
try {
const { container } = req.body;
const { originalname, buffer } = req.file;
const containerClient = blobService.getContainerClient(container);
await containerClient.getBlockBlobClient(originalname).uploadData(buffer);
res.json({ message: "success" });
} catch (error) {
res.status(500).json({ message: error.message });
}
};
Get Blob
export const getBlob = async (req, res) => {
try {
const { container, filename } = req.params;
const containerClient = blobService.getContainerClient(container);
res.header("Content-Type", "image/jpg");
const response = await containerClient
.getBlockBlobClient(filename)
.downloadToBuffer();
res.send(response);
} catch (error) {
res.status(500).json({ message: error.message });
}
};
Download Blob
export const downloadBlob = async (req, res) => {
try {
const { container, filename } = req.params;
const containerClient = blobService.getContainerClient(container);
const response = await containerClient
.getBlockBlobClient(filename)
.downloadToBuffer();
res.send(response);
} catch (error) {
res.status(500).json({ message: error.message });
}
};
Delete Blob
export const deleteBlob = async (req, res) => {
try {
const { container, filename } = req.body;
const containerClient = blobService.getContainerClient(container);
const response = await containerClient
.getBlockBlobClient(filename)
.deleteIfExists();
res.send(response);
} catch (error) {
res.status(500).json({ message: error.message });
}
};
Methods for Containers (Folders)
Create Container
export const createContainer = (req, res) => {
try {
const { container } = req.body;
blobService.createContainer(container);
res.json({ message: "success" });
} catch (error) {
res.status(500).json({ message: error.message });
}
};
Delete Container
export const deleteContainer = (req, res) => {
try {
const { container } = req.body;
blobService.deleteContainer(container);
res.json({ message: "success" });
} catch (error) {
res.status(500).json({ message: error.message });
}
};
List Containers
export const listContainer = async (req, res) => {
try {
let containers = [];
for await (const container of blobService.listContainers()) {
containers.push(container.name);
}
res.json({ containers });
} catch (error) {
res.status(500).json({ message: error.message });
}
};
Example in GitHub Gist
https://gist.github.com/nelsoncode019/5efaa894e26f0e7c8566ae3891dbb9a8
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