Azion Runtime and Node.js API compatibility

Node built-in

The compatibility between Azion Runtime and Node.js is an ongoing task, but a set of Node Runtime APIs are listed and compatible with Azion Runtime. The following list of APIs can be imported inside edge functions with the standard import syntax:

import { API } from "import-origin";

FS support

Async:

• fs.lstat(path[, options], callback)
• fs.mkdir(path[, options], callback)
• fs.stat(path[, options], callback)
• fs.writeFile(file, data[, options], callback)
• fs.readFile(path[, options], callback)
• fs.readdir(path[, options], callback)
• fs.writeFileSync(file, data[, options])
• fs.rename(oldPath, newPath, callback)
• fs.realpath(path[, options], callback)
• fs.copyFile(src, dest[, mode], callback)
• fs.cp(src, dest[, options], callback)
• fs.read(fd, buffer, offset, length, position, callback)
• fs.read(fd, buffer[, options], callback)
• fs.read(fd[, options], callback)
• fs.rmdir(path[, options], callback)
• fs.utimes(path, atime, mtime, callback)

Node polyfills

A polyfill is a code snippet, often used in JavaScript, that brings new features to environments lacking these capabilities. Polyfills are used during build time at Azion and can be configured through the azion.config.js file.

Here’s a list of Node APIs supported through polyfills:

For additional compatibility information: