# For Developers

### For Developers <a href="#for-developers" id="for-developers"></a>

Lambda provide SDK for developers for easily integrate into web3 application with a few codes

### [#](https://docs.lambda.im/storage/developers.html#file-upload)File Upload <a href="#file-upload" id="file-upload"></a>

This is a simple [demo (opens new window)](https://github.com/LambdaIM/upload_demo)demonstrates how to upload file or folder

#### [#](https://docs.lambda.im/storage/developers.html#installation)Installation <a href="#installation" id="installation"></a>

<mark style="background-color:purple;">yarn install</mark>

#### [#](https://docs.lambda.im/storage/developers.html#run)Run <a href="#run" id="run"></a>

//upload file&#x20;

<mark style="background-color:purple;">yarn upload-file</mark>

//upload folder&#x20;

<mark style="background-color:purple;">yarn upload-folder</mark>

#### [#](https://docs.lambda.im/storage/developers.html#integration)Integration <a href="#integration" id="integration"></a>

1. How to upload file

<mark style="background-color:purple;">const LambdaStorage = require('./LambdaStorage');</mark>

<mark style="background-color:purple;">const filePath = './data/file-to-upload.png';</mark>

<mark style="background-color:purple;">const lambdaStorage = new LambdaStorage();</mark>

<mark style="background-color:purple;">console.log(</mark><mark style="background-color:purple;">`Uploading ${filePath}...`</mark><mark style="background-color:purple;">);</mark>

<mark style="background-color:purple;">lambdaStorage.upload(filePath).then((response) => { console.log(response); }).catch((error) => { console.log(error); });</mark>

2. How to upload folder

<mark style="background-color:purple;">const LambdaStorage = require('./LambdaStorage');</mark>

<mark style="background-color:purple;">const folderPath = './data/folder-to-upload/';</mark>

<mark style="background-color:purple;">const lambdaStorage = new LambdaStorage();</mark>

<mark style="background-color:purple;">console.log(</mark><mark style="background-color:purple;">`Uploading folder ${folderPath}...`</mark><mark style="background-color:purple;">);</mark>

<mark style="background-color:purple;">lambdaStorage.upload(folderPath,true).then((response) => { console.log(response); }).catch((error) => { console.log(error); });</mark>

### [#](https://docs.lambda.im/storage/developers.html#submit-onchain)Submit onchain <a href="#submit-onchain" id="submit-onchain"></a>

#### [#](https://docs.lambda.im/storage/developers.html#installation-2)Installation <a href="#installation-2" id="installation-2"></a>

<mark style="background-color:purple;">npm i lambdaupload</mark>

#### [#](https://docs.lambda.im/storage/developers.html#submit)Submit <a href="#submit" id="submit"></a>

You need to provide account address, file name, cid and filesize

<mark style="background-color:purple;">import { uploadFiles } from 'lambdaupload'</mark>

<mark style="background-color:purple;">await uploadFiles({ provider, account, name, cid, filesize })</mark>

You need to submit the actual file/folder size, otherwise storage node will refuse to provide data availability for mismatch size.

#### [#](https://docs.lambda.im/storage/developers.html#get-file-size)Get file size <a href="#get-file-size" id="get-file-size"></a>

<mark style="background-color:purple;">import { getFileSize } from 'lambdaupload'</mark>

<mark style="background-color:purple;">await getFileSize({ provider, cid})</mark>