Generate Dummy Test Files of Any Size Generate files of any specified size for testing uploads, downloads, and storage systems.

The tool works by using the Blob constructor to create a binary file from an array of Uint8Array chunks. Each chunk is generated based on the selected content type, which can be null bytes, random data, or lorem text. The random data is generated using the crypto.getRandomValues function, while the lorem text is created by encoding a repeating string using the TextEncoder API. The size of each chunk is limited to 1MB to prevent the browser from running out of memory when generating large files.

The tool uses a while loop to generate chunks until the total size reaches the specified value, which is calculated based on the selected unit (KB, MB, or GB) and converted to bytes using the formula KB*1024, MB*1024^2, and GB*1024^3. The progress bar is updated after each chunk is generated by setting the progress state to the percentage of total bytes generated. Once all chunks are generated, they are passed to the Blob constructor along with the MIME type 'application/octet-stream' to create a binary file.

The file is then downloaded using the URL.createObjectURL function, which creates a URL that can be used to download the file. The tool simulates a click on an anchor element with this URL as its href attribute, triggering the download. After the download is complete, the URL is revoked using URL.revokeObjectURL to release system resources. This approach allows the tool to generate and download large files entirely in the browser without requiring server-side infrastructure.

The use of Uint8Array chunks and the Blob constructor enables efficient generation and handling of binary data, while the crypto.getRandomValues function provides a secure source of random numbers for generating random data. The TextEncoder API is used to encode the lorem text, ensuring that it can be correctly represented as a binary file. By leveraging these browser APIs and data structures, the tool provides a flexible and efficient solution for generating dummy files with customizable content types and sizes.