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| Original author(s) | TJ Holowaychuk |
|---|---|
| Developer(s) | OpenJS Foundation and others |
| Initial release | 16 November 2010; 14 years ago (2010-11-16) |
| Stable release | 5.1.0 / March 31, 2025; 12 days ago[1]  |
| Repository | |
| Written in | JavaScript |
| Platform | Node.js |
| Type | Web framework |
| License | MIT License |
| Website | expressjs |
Express.js, or simplyExpress, is aback endweb application framework for buildingRESTful APIs withNode.js, released asfree and open-source software under theMIT License. It is designed for buildingweb applications andAPIs.[2] It has been called thede facto standard server framework forNode.js.[3]
The original author, TJ Holowaychuk, described it as aSinatra-inspired server,[4] meaning that it is relatively minimal with many features available as plugins. Express is the back-end component of popular development stacks like theMEAN, MERN or MEVN stack, together with theMongoDB database software and aJavaScript front-end framework or library.[5]
Express.js was founded by TJ Holowaychuk. The first release, according to Express.js'sGitHub repository, was on 22 May 2010. Version 0.12
In June 2014, rights to manage the project were acquired byStrongLoop.[6] StrongLoop was acquired byIBM in September 2015;[7] in January 2016, IBM announced that it would place Express.js under the stewardship of theNode.js Foundation incubator.[8]
Express.js is used byFox Sports,PayPal,Uber andIBM.[9]
The following program will respond toHTTP GET requests with the text 'Hi, your request has been received', and listen to the port the program is running on (in this case, port 2000).
// Importing the Express library.constexpress=require('express');// Initializing the app.constapp=express();// Getting the path request and sending the response with text.app.get('/',(req,res)=>{res.send('Hi, your request has been received');});// Listening on port 2000.app.listen(2000,()=>{console.log('listening at http://localhost:2000');});
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