htmx 4.0 is under construction — migration guide

htmx.config

Configure htmx behavior globally

The htmx.config object holds the current htmx configuration. You can modify it in JavaScript or set values using a <meta> tag.

Configuration via Meta Tag

Set config values in your HTML <head>:

<meta name="htmx-config" content='{"defaultSwap":"outerHTML","defaultTimeout":5000}'>

Configuration via JavaScript

Modify config values directly:

htmx.config.defaultSwap = 'outerHTML'; htmx.config.defaultTimeout = 5000;

Available Options

  • version - htmx version (read-only)
  • logAll - Log all htmx events (default: false)
  • prefix - Attribute prefix (default: "")
  • transitions - Enable view transitions (default: false)
  • history - Enable history support (default: true)
  • mode - Request mode for fetch (default: "same-origin")
  • defaultSwap - Default swap style (default: "innerHTML")
  • indicatorClass - CSS class for indicators (default: "htmx-indicator")
  • requestClass - CSS class during requests (default: "htmx-request")
  • includeIndicatorCSS - Include default indicator CSS (default: true)
  • defaultTimeout - Request timeout in ms (default: 60000)
  • extensions - Extensions to load (default: "")
  • morphIgnore - Attributes to ignore during morphing (default: ["data-htmx-powered"])
  • morphSkip - CSS selector for elements to skip morphing entirely (default: undefined)
  • morphSkipChildren - CSS selector for elements whose children won’t be morphed (default: undefined)
  • noSwap - HTTP status codes that skip swap (default: [204, 304])
  • implicitInheritance - Enable implicit attribute inheritance (default: false)