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HTMX

Lightweight JavaScript library enabling AJAX, WebSockets, and server-sent events in HTML

Overview

What HTMX does

HTMX is a minimal, pragmatic JavaScript library that brings modern interactivity capabilities directly into HTML markup through declarative attributes. Rather than building applications with extensive JavaScript frameworks, HTMX enables developers to add interactivity by using HTML attributes like hx-get, hx-post, hx-put, hx-patch, and hx-delete to make HTTP requests, along with hx-target to specify which elements to update and hx-swap to control how responses are inserted into the DOM. The library removes traditional constraints by allowing any HTML element to make requests, supporting all HTTP methods beyond GET and POST, and enabling targeted updates of specific page sections rather than full-page replacements. At just 16 kilobytes minified and gzipped with zero dependencies, HTMX is significantly smaller than modern JavaScript frameworks. Real-world implementations have reported reducing codebase complexity by 67 percent compared to React. The library maintains REST principles by working with HTML fragments returned from servers rather than JSON APIs, keeping applications within the original web programming model.

What people use it for

  • Building interactive applications without JavaScript framework complexity
  • Server-rendered applications requiring dynamic updates
  • Adding interactivity to existing server-side applications
  • Hypermedia-driven applications using HTML-first approaches

The honest half

Where it falls short

Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about HTMX.

  • Best suited for server-rendered architectures, not pure client-side SPAs
  • Limited client-side state management capabilities compared to frameworks
  • Smaller ecosystem with fewer third-party libraries and tools
  • Learning curve for developers from JavaScript framework backgrounds

Cross-shopped

What people choose instead of HTMX

Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.

  • HTMX logo
    HTMX
    vs
    Alpine.js logo
    Alpine.js

    Alpine.js: Lightweight JavaScript framework for adding interactivity within HTML

  • HTMX logo
    HTMX
    vs
    React logo
    React

    React: Comprehensive JavaScript library for building interactive user interfaces

Capabilities

Features

  • AJAX requests

    Make HTTP requests from any HTML element

  • HTTP verb support

    Support for GET, POST, PUT, PATCH, DELETE

  • DOM targeting

    Target any element for updates via CSS selectors

  • Swap strategies

    Multiple swap strategies: innerHTML, outerHTML, beforeend, morphing

  • WebSocket support

    WebSocket integration for real-time bidirectional communication

  • Server-sent events

    SSE integration for server-to-client streaming

  • Out-of-band updates

    Update multiple elements from single response

Answered, with sources

Questions people ask

Each answer names the page it came from, so you can check it rather than take our word for it.

How big is the HTMX JavaScript library?

HTMX is only 16 kilobytes minified and gzipped with zero external dependencies.

Source
Can HTMX work with JSON APIs?

While HTMX is optimized for HTML responses, it can work with JSON through additional configuration and response handling.

Source
Does HTMX support real-time features like WebSockets?

Yes, HTMX includes support for WebSockets and server-sent events for real-time bidirectional communication.

Source
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Softwr does not host reviews and shows no star rating for HTMX, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.

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