77 lines
2.4 KiB
Text
77 lines
2.4 KiB
Text
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### Migration to SVR.JS
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If you have previously built your web application using the Node.JS http library, Express framework, or Koa framework, you can easily migrate that code to SVR.JS server-side JavaScript.
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#### From Node.JS http library
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For applications built with the Node.JS http library, you can simply copy the contents of the request event listener to the SVR.JS server-side JavaScript. However, make sure to consider the _disableEndElseCallbackExecute_ option to ensure proper execution flow.
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```js
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disableEndElseCallbackExecute = true; //Without "var", else it will not work!!!
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// Node.JS http library request event listener code goes here.
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if (req.url == "/" && req.method == "GET") {
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res.writeHead(200, "OK", {
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"Content-Type": "text/plain",
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});
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res.end("Hello World!");
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return;
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}
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elseCallback(); // Optionally, invoke main SVR.JS callback.
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```
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#### From Express Framework
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If your application is built using the Express framework, you can easily migrate it to SVR.JS. You can mix Express methods with SVR.JS methods for more flexibility.
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```js
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disableEndElseCallbackExecute = true; //Without "var", else it will not work!!!
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var express = require("express");
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// Other requires go here.
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var app = express(); // Initialize express app
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// Express application code goes here!
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app.get("/", function (req, res) {
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res.send("Hello World!");
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});
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app.use(elseCallback); // Optionally, if you want the main SVR.JS callback.
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app(req, res); // Invoke Express handler
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```
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#### From Koa Framework
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Migrating from the Koa framework to SVR.JS is also straightforward. Here's an example of how you can do it:
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```js
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disableEndElseCallbackExecute = true; //Without "var", else it will not work!!!
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var koa = require("koa");
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// Other requires go here.
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var app = new koa(); // Initialize Koa app
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// Koa application code goes here!
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app.use(function (ctx, next) {
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if (ctx.method != "GET" || ctx.path != "/") {
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next(); // Koa router could be used...
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} else {
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ctx.body = "Hello World!";
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}
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});
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// Optionally, if you want the main SVR.JS callback (not recommended by Koa, as it passes Node.JS req and res objects).
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app.use(function (ctx) {
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ctx.respond = false;
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elseCallback(ctx.req, ctx.res);
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});
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app.callback()(req, res); // Invoke Koa handler
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```
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By migrating your web application to SVR.JS, you can take advantage of its features and performance enhancements, while still preserving your existing codebase.
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