Change8

FastHTML

Frontend & Mobile

The fastest way to create an HTML app

Latest: 0.14.1325 releases2 breaking changes1 common errorsView on GitHub

Release History

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0.14.131 fix1 feature
Sep 3, 2026

Introduced a new `procs` option to the `serve` command for running applications as multiple processes. Also updated CLI flags for fastcore.script hyphenation.

0.14.122 fixes
Aug 19, 2026

This release addresses two bugs: one related to passing annotations in `add_sig_param` and another concerning argument handling in POST routes when `f` is used as a parameter.

0.14.112 fixes
Jul 31, 2026

This release addresses bugs related to duplicate HTMX component parameters and duplicated attributes in components.pyi.

0.14.102 fixes
Jul 31, 2026

This release addresses bugs related to duplicate HTMX component parameters and duplicated attributes in components.pyi.

0.14.91 feature
Jul 19, 2026

This release replaces local port-waiting helpers with imports from fastcore.net, improving code organization and potentially leveraging more robust network utilities.

0.14.8
Jul 19, 2026
0.14.71 feature
Jul 19, 2026

This release replaces local port-waiting helpers with imports from fastcore.net, improving code organization and potentially leveraging more robust network utilities.

0.14.62 features
Jul 11, 2026

Introduced StaticImmutable class and vurl helper for versioned static file URLs. Also, implemented deterministic uuid5 for devtools workspace and returns root as a string.

0.14.51 fix3 features
Jul 9, 2026

This release introduces new features for handling disconnections and tag casing, alongside a fix for parsing empty JSON bodies.

0.14.43 fixes1 feature
Jun 27, 2026

This release introduces a new helper for upload progress bars and fixes several bugs related to route handling, falsy value conversion, and JSON body parsing.

0.14.33 features
Jun 19, 2026

This release introduces configurable multipart upload size limits and updates the core HTTP client dependency to httpx2, alongside improvements to async waiting in JupyUvi.

0.14.2
May 29, 2026
0.14.1Breaking6 features
May 10, 2026

This release focuses on performance improvements by speeding up imports and introduces significant new routing features, including class-based route groups and route beforeware functionality. Several internal imports were removed from `fasthtml.common`.

0.14.0Breaking6 features
May 10, 2026

This release focuses on performance improvements by speeding up imports and introduces significant new routing features, including class-based route groups and route beforeware support. It also adds enhanced testing utilities.

0.13.41 fix2 features
Apr 23, 2026

This release introduces improved JSON serialization for lists and removes unnecessary internal logic, alongside a change in how 'scope' is handled.

0.13.31 fix4 features
Apr 7, 2026

This release introduces new utility features like the `into` decorator and fixes a critical WebSocket crash related to null header values from HTMX.

0.13.21 fix
Mar 27, 2026

This release focuses on fixing a bug related to WebSocket header lookup key mismatches.

0.13.12 features
Mar 24, 2026

This release refactors lifespan handling into a dedicated Lifespan class and introduces support for adding websocket routes.

0.13.01 fix1 feature
Mar 23, 2026

This release introduces a new helper for Starlette 1.x compatibility and resolves an issue with the missing format_datetime function.

0.12.501 fix1 feature
Mar 13, 2026

This release introduces the new HostRoute class for host-header based routing and fixes a bug where `_fix_anno` was incorrectly handling bare `list` annotations.

0.12.491 fix1 feature
Mar 13, 2026

This release introduces the new HostRoute class for host-header based routing and fixes a bug where `_fix_anno` was incorrectly handling bare `list` annotations.

0.12.481 fix
Mar 2, 2026

This release focuses on fixing a bug related to caching request bodies based on the content-type header.

0.12.472 features
Feb 21, 2026

This release introduces new usability features for ApiReturn, allowing it to be called without arguments and supporting direct boolean context checks.

0.12.461 feature
Feb 21, 2026

This release introduces the __bool__ method to ApiReturn, enabling direct boolean context support.

0.12.451 feature
Feb 21, 2026

This release extends HTTP request parameter handling capabilities to websocket connections.

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