fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Why this rank:Strong adoptionRecent releaseHealthy release cadence
Description
<p align="center"> <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a> </p> <p align="center"> <em>FastAPI framework, high performance, easy to learn, fast to code, ready for production</em> </p> <p align="center"> <a href="https://github.com/fastapi/fastapi/actions?query=workflow%3ATest+event%3Apush+branch%3Amaster"> <img src="https://github.com/fastapi/fastapi/actions/workflows/test.yml/badge.svg?event=push&branch=master" alt="Test"> </a> <a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/fastapi"> <img src="https://coverage-badge.samuelcolvin.workers.dev/fastapi/fastapi.svg" alt="Coverage"> </a> <a href="https://pypi.org/project/fastapi"> <img src="https://img.shields.io/pypi/v/fastapi?color=%2334D058&label=pypi%20package" alt="Package version"> </a> <a href="https://pypi.org/project/fastapi"> <img src="https://img.shields.io/pypi/pyversions/fastapi.svg?color=%2334D058" alt="Supported Python versions"> </a> </p> --- **Documentation**: [https://fastapi.tiangolo.com](https://fastapi.tiangolo.com) **Source Code**: [https://github.com/fastapi/fastapi](https://github.com/fastapi/fastapi) --- FastAPI is a modern, fast (high-performance), web framework for building APIs with Python based on standard Python type hints. The key features are: * **Fast**: Very high performance, on par with **NodeJS** and **Go** (thanks to Starlette and Pydantic). [One of the fastest Python frameworks available](#performance). * **Fast to code**: Increase the speed to develop features by about 200% to 300%. * * **Fewer bugs**: Reduce about 40% of human (developer) induced errors. * * **Intuitive**: Great editor support. <dfn title="also known as auto-complete, autocompletion, IntelliSense">Completion</dfn> everywhere. Less time debugging. * **Easy**: Designed to be easy to use and learn. Less time reading docs. * **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs. * **Robust**: Get production-ready code. With automatic interactive documentation. * **Standards-based**: Based on (and fully compatible with) the open standards for APIs: [OpenAPI](https://github.com/OAI/OpenAPI-Specification) (previously known as Swagger) and [JSON Schema](https://json-schema.org/). <small>* estimation based on tests conducted by an internal development team, building production applications.</small> ## Sponsors <!-- sponsors --> ### Keystone Sponsor <a href="https://fastapicloud.com" target="_blank" title="FastAPI Cloud. By the same team behind FastAPI. You code. We Cloud."><img src="https://fastapi.tiangolo.com/img/sponsors/fastapicloud.png"></a> ### Gold and Silver Sponsors <a href="https://blockbee.io?ref=fastapi" target="_blank" title="BlockBee Cryptocurrency Payment Gateway"><img src="https://fastapi.tiangolo.com/img/sponsors/blockbee.png"></a> <a href="https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=main-badge" target="_blank" title="Scalar: Beautiful Open-Source API References from Swagger/OpenAPI files"><img src="https://fastapi.tiangolo.com/img/sponsors/scalar.svg"></a> <a href="https://www.propelauth.com/?utm_source=fastapi&utm_campaign=1223&utm_medium=mainbadge" target="_blank" title="Auth, user management and more for your B2B product"><img src="https://fastapi.tiangolo.com/img/sponsors/propelauth.png"></a> <a href="https://zuplo.link/fastapi-gh" target="_blank" title="Zuplo: Deploy, Secure, Document, and Monetize your FastAPI"><img src="https://fastapi.tiangolo.com/img/sponsors/zuplo.png"></a> <a href="https://liblab.com?utm_source=fastapi" target="_blank" title="liblab - Generate SDKs from FastAPI"><img src="https://fastapi.tiangolo.com/img/sponsors/liblab.png"></a> <a href="https://docs.render.com/deploy-fastapi?utm_source=deploydoc&utm_medium=referral&utm_campaign=fastapi" target="_blank" title="Deploy & scale any full-stack web app on Render. Focus on building apps, not infra."><img src="https://fastapi.tiangolo.com/img/sponsors/render.svg"></a> <a href="https://www.coderabbit.ai/?utm_source=fastapi&utm_medium=badge&utm_campaign=fastapi" target="_blank" title="Cut Code Review Time & Bugs in Half with CodeRabbit"><img src="https://fastapi.tiangolo.com/img/sponsors/coderabbit.png"></a> <a href="https://subtotal.com/?utm_source=fastapi&utm_medium=sponsorship&utm_campaign=open-source" target="_blank" title="The Gold Standard in Retail Account Linking"><img src="https://fastapi.tiangolo.com/img/sponsors/subtotal.svg"></a> <a href="https://docs.railway.com/guides/fastapi?utm_medium=integration&utm_source=docs&utm_campaign=fastapi" target="_blank" title="Deploy enterprise applications at startup speed"><img src="https://fastapi.tiangolo.com/img/sponsors/railway.png"></a> <a href="https://serpapi.com/?utm_source=fastapi_website" target="_blank" title="SerpApi: Web Search API"><img src="https://fastapi.tiangolo.com/img/sponsors/s
Release History
| Version | Changes | Urgency | Date |
|---|---|---|---|
| 0.162.0 | Omitted `bool` and `bool | None` form fields now use their declared defaults or produce missing-field errors, consistent with other fields and Pydantic behavior. FastAPI no longer infers `False` for omitted booleans. This applies to individual form parameters, form models, and unions of form models. Omitted boolean model fields are excluded from `model_dump(exclude_unset=True)`, and their defaults no longer count as submitted fields during union selection. Default factories and `validate_defa | High | 10/23/2026 |
| 0.161.1 | ### Fixes * ๐ Fix OpenAPI schemas for standalone nullable form unions. PR [#16598](https://github.com/fastapi/fastapi/pull/16598) by [@tiangolo](https://github.com/tiangolo). | High | 10/22/2026 |
| 0.159.1 | ### Features * โจ Add support for optional unions of form models. PR [#16586](https://github.com/fastapi/fastapi/pull/16586) by [@tiangolo](https://github.com/tiangolo). | High | 10/21/2026 |
| 0.156.8 | ### Fixes * ๐ Preserve uploaded file positions when converting to `bytes`. PR [#16566](https://github.com/fastapi/fastapi/pull/16566) by [@tiangolo](https://github.com/tiangolo). | High | 10/21/2026 |
| 0.156.2 | ### Fixes * ๐ Preserve Pydantic field metadata in inferred request parameters. PR [#16553](https://github.com/fastapi/fastapi/pull/16553) by [@tiangolo](https://github.com/tiangolo). | High | 10/20/2026 |
| 0.151.0 | JSON request bodies now distinguish an explicit `null` from an omitted value. For individual `Body` parameters, `null` is validated as `None`: nullable types accept it, and non-nullable types reject it even when a default is defined. Defaults and default factories apply only when the value is omitted. This applies both to parameters inside JSON objects and to parameters representing the entire body. Clients that used `null` to request a default should omit the value instead. When a JSON objec | High | 10/20/2026 |
| 0.147.0 | Omitted `bool` and `bool | None` form fields are now interpreted as `False`, matching unchecked HTML checkboxes. This applies to individual `Form` parameters and form models, including required fields and fields with defaults of `True` or `None`. The inferred value is considered explicitly set, including in `model_dump(exclude_unset=True)`. JSON requests and direct Pydantic validation are unchanged. See [Boolean Form Fields](https://fastapi.tiangolo.com/tutorial/request-forms/#boolean-form-fi | High | 10/19/2026 |
| 0.143.5 | ### Fixes * ๐ Fix handling of empty value for `byte` file list parameter. PR [#9383](https://github.com/fastapi/fastapi/pull/9383) by [@Viicos](https://github.com/Viicos). | High | 10/18/2026 |
| 0.143.3 | ### Fixes * ๐ Fix non-finite float serialization in JSONL and SSE streams. PR [#16509](https://github.com/fastapi/fastapi/pull/16509) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐จ Update Python format in Markdown with Ruff. PR [#16505](https://github.com/fastapi/fastapi/pull/16505) by [@tiangolo](https://github.com/tiangolo). | High | 10/16/2026 |
| 0.143.2 | ### Fixes * ๐ Fix blocking frontend fallback file checks. PR [#16503](https://github.com/fastapi/fastapi/pull/16503) by [@tiangolo](https://github.com/tiangolo). ### Translations * ๐ Update translations for zh-hant (update-outdated). PR [#16500](https://github.com/fastapi/fastapi/pull/16500) by [@pr-submit[bot]](https://github.com/apps/pr-submit). * ๐ Update translations for ja (update-outdated). PR [#16499](https://github.com/fastapi/fastapi/pull/16499) by [@pr-submit[bot]](https:/ | High | 10/15/2026 |
| 0.143.1 | ### Fixes * ๐ Fix included route metadata in `iter_route_contexts()`. PR [#16484](https://github.com/fastapi/fastapi/pull/16484) by [@tiangolo](https://github.com/tiangolo). | High | 10/14/2026 |
| 0.143.0 | Automatic OpenTelemetry exporter setup is now opt-in. If you rely on FastAPI to configure exporters from `OTEL_*` environment variables, set `FASTAPI_OTEL_AUTO_CONFIGURE=true` or use `FastAPI(telemetry={"auto_configure": True})` to retain the previous behavior. Applications that configure their own providers and exporters require no changes. FastAPI Cloud enables automatic setup for you. ### Breaking Changes * ๐ฅ Require opt-in for automatic OpenTelemetry exporter setup. PR [#16476](htt | High | 10/8/2026 |
| 0.142.4 | ### Fixes * ๐ Isolate FastAPI telemetry for excluded requests. PR [#16470](https://github.com/fastapi/fastapi/pull/16470) by [@tiangolo](https://github.com/tiangolo). | High | 10/7/2026 |
| 0.142.2 | ### Fixes * ๐ Allow startup when automatic OpenTelemetry configuration fails. PR [#16418](https://github.com/fastapi/fastapi/pull/16418) by [@tiangolo](https://github.com/tiangolo). | High | 9/30/2026 |
| 0.141.1 | ### Fixes * ๐ Fix support for background tasks and headers from dependencies in `app.frontend()`. PR [#16105](https://github.com/fastapi/fastapi/pull/16105) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐ Document `FASTAPI_ENV` in FastAPI CLI guide. PR [#16104](https://github.com/fastapi/fastapi/pull/16104) by [@tiangolo](https://github.com/tiangolo). | Medium | 7/29/2026 |
| 0.140.7 | ### Refactors * โก๏ธ Avoid flattening dependencies for OpenAPI. PR [#16076](https://github.com/fastapi/fastapi/pull/16076) by [@tiangolo](https://github.com/tiangolo). ### Internal * โฌ๏ธ Upgrade latest-changes to 0.7.1. PR [#16077](https://github.com/fastapi/fastapi/pull/16077) by [@tiangolo](https://github.com/tiangolo). * ๐ท Add OpenAPI dependency benchmarks. PR [#16075](https://github.com/fastapi/fastapi/pull/16075) by [@tiangolo](https://github.com/tiangolo). | High | 7/27/2026 |
| 0.139.2 | ### Fixes * ๐ Refactor router route building to make it thread-safe, mainly relevant for tests running in parallel threads (uncommon). PR [#16013](https://github.com/fastapi/fastapi/pull/16013) by [@tiangolo](https://github.com/tiangolo). | High | 7/16/2026 |
| 0.139.0 | ### Features * โจ Support dependencies in `app.frontend()`, e.g. for automatic cookie authentication for the frontend. PR [#15908](https://github.com/fastapi/fastapi/pull/15908) by [@tiangolo](https://github.com/tiangolo). ### Translations * ๐ Update translations for fr (update-outdated). PR [#15897](https://github.com/fastapi/fastapi/pull/15897) by [@tiangolo](https://github.com/tiangolo). * ๐ Update translations for ja (update-outdated). PR [#15895](https://github.com/fastapi/fastap | Medium | 7/1/2026 |
| 0.138.2 | ### Refactors * โป๏ธ Make `app.frontend()` return 404 for methods other than `GET` or `HEAD` with no static file matches. PR [#15863](https://github.com/fastapi/fastapi/pull/15863) by [@tiangolo](https://github.com/tiangolo). ### Internal * ๐ง Update sponsors: remove Stainless. PR [#15862](https://github.com/fastapi/fastapi/pull/15862) by [@tiangolo](https://github.com/tiangolo). * โป๏ธ Refactor how sponsors data is handled for banners. PR [#15852](https://github.com/fastapi/fastapi/pull/1 | High | 6/29/2026 |
| 0.138.0 | ### Features * โจ Add support for `app.frontend("/", directory="dist")` and `router.frontend("/", directory="dist")`. PR [#15800](https://github.com/fastapi/fastapi/pull/15800) by [@tiangolo](https://github.com/tiangolo). * Read the docs: [Frontend](https://fastapi.tiangolo.com/tutorial/frontend/). ### Docs * ๐ Fix typo in release notes. PR [#15807](https://github.com/fastapi/fastapi/pull/15807) by [@tiangolo](https://github.com/tiangolo). * ๐ Add `app.frontend()` instructions to | High | 6/20/2026 |
| 0.137.1 | ### Fixes * ๐จ Fix typing checks for APIRoute. PR [#15765](https://github.com/fastapi/fastapi/pull/15765) by [@tiangolo](https://github.com/tiangolo). * ๐ Fix bug, allow empty path in path operation in prefixless router. PR [#15763](https://github.com/fastapi/fastapi/pull/15763) by [@tiangolo](https://github.com/tiangolo). | High | 6/15/2026 |
| 0.136.3 | ### Refactors * โป๏ธ Do not accept underscore headers when using `convert_underscores=True` (the default). PR [#15589](https://github.com/fastapi/fastapi/pull/15589) by [@tiangolo](https://github.com/tiangolo). | High | 5/23/2026 |
| 0.136.1 | ### Upgrades * โฌ๏ธ Update Pydantic v2 code to address deprecations. PR [#15101](https://github.com/fastapi/fastapi/pull/15101) by [@svlandeg](https://github.com/svlandeg). ### Internal * ๐จ Tweak translation script. PR [#15174](https://github.com/fastapi/fastapi/pull/15174) by [@YuriiMotov](https://github.com/YuriiMotov). * โฌ Bump mkdocs-material from 9.7.1 to 9.7.6. PR [#15408](https://github.com/fastapi/fastapi/pull/15408) by [@dependabot[bot]](https://github.com/apps/dependabot). * | High | 4/23/2026 |
| 0.136.0 | Imported from PyPI (0.136.0) | Low | 4/21/2026 |
| 0.135.4 | ### Refactors * ๐ฅ Remove April Fool's `@app.vibe()` ๐คช. PR [#15363](https://github.com/fastapi/fastapi/pull/15363) by [@tiangolo](https://github.com/tiangolo). ### Internal * โฌ Bump cryptography from 46.0.5 to 46.0.7. PR [#15314](https://github.com/fastapi/fastapi/pull/15314) by [@dependabot[bot]](https://github.com/apps/dependabot). * โฌ Bump strawberry-graphql from 0.307.1 to 0.312.3. PR [#15309](https://github.com/fastapi/fastapi/pull/15309) by [@dependabot[bot]](https://github.com/ | High | 4/16/2026 |
| 0.135.3 | ### Features * โจ Add support for `@app.vibe()`. PR [#15280](https://github.com/fastapi/fastapi/pull/15280) by [@tiangolo](https://github.com/tiangolo). * New docs: [Vibe Coding](https://fastapi.tiangolo.com/advanced/vibe/). ### Docs * โ๏ธ Fix typo for `client_secret` in OAuth2 form docstrings. PR [#14946](https://github.com/fastapi/fastapi/pull/14946) by [@bysiber](https://github.com/bysiber). ### Internal * ๐ฅ Update FastAPI People - Experts. PR [#15279](https://github.com/fa | Medium | 4/1/2026 |
| 0.135.2 | ### Upgrades * โฌ๏ธ Increase lower bound to `pydantic >=2.9.0.` and fix the test suite. PR [#15139](https://github.com/fastapi/fastapi/pull/15139) by [@svlandeg](https://github.com/svlandeg). ### Docs * ๐ Add missing last release notes dates. PR [#15202](https://github.com/fastapi/fastapi/pull/15202) by [@tiangolo](https://github.com/tiangolo). * ๐ Update docs for contributors and team members regarding translation PRs. PR [#15200](https://github.com/fastapi/fastapi/pull/15200) by [@Yu | Medium | 3/23/2026 |
| 0.135.1 | ### Fixes * ๐ Fix, avoid yield from a TaskGroup, only as an async context manager, closed in the request async exit stack. PR [#15038](https://github.com/fastapi/fastapi/pull/15038) by [@tiangolo](https://github.com/tiangolo). ### Docs * โ๏ธ Fix typo in `docs/en/docs/_llm-test.md`. PR [#15007](https://github.com/fastapi/fastapi/pull/15007) by [@adityagiri3600](https://github.com/adityagiri3600). * ๐ Update Skill, optimize context, trim and refactor into references. PR [#15031](https:/ | Low | 3/1/2026 |
| 0.135.0 | ### Features * โจ Add support for Server Sent Events. PR [#15030](https://github.com/fastapi/fastapi/pull/15030) by [@tiangolo](https://github.com/tiangolo). * New docs: [Server-Sent Events (SSE)](https://fastapi.tiangolo.com/tutorial/server-sent-events/). | Low | 3/1/2026 |
| 0.134.0 | ### Features * โจ Add support for streaming JSON Lines and binary data with `yield`. PR [#15022](https://github.com/fastapi/fastapi/pull/15022) by [@tiangolo](https://github.com/tiangolo). * This also upgrades Starlette from `>=0.40.0` to `>=0.46.0`, as it's needed to properly unrwap and re-raise exceptions from exception groups. * New docs: [Stream JSON Lines](https://fastapi.tiangolo.com/tutorial/stream-json-lines/). * And new docs: [Stream Data](https://fastapi.tiangolo.com/a | Low | 2/27/2026 |
| 0.133.1 | ### Features * ๐ง Add FastAPI Agent Skill. PR [#14982](https://github.com/fastapi/fastapi/pull/14982) by [@tiangolo](https://github.com/tiangolo). * Read more about it in [Library Agent Skills](https://tiangolo.com/ideas/library-agent-skills/). ### Internal * โ Fix all tests are skipped on Windows. PR [#14994](https://github.com/fastapi/fastapi/pull/14994) by [@YuriiMotov](https://github.com/YuriiMotov). | Low | 2/25/2026 |
| 0.133.0 | ### Upgrades * โฌ๏ธ Add support for Starlette 1.0.0+. PR [#14987](https://github.com/fastapi/fastapi/pull/14987) by [@tiangolo](https://github.com/tiangolo). | Low | 2/24/2026 |
| 0.132.1 | ### Refactors * โป๏ธ Refactor logic to handle OpenAPI and Swagger UI escaping data. PR [#14986](https://github.com/fastapi/fastapi/pull/14986) by [@tiangolo](https://github.com/tiangolo). ### Internal * ๐ฅ Update FastAPI People - Experts. PR [#14972](https://github.com/fastapi/fastapi/pull/14972) by [@tiangolo](https://github.com/tiangolo). * ๐ท Allow skipping `benchmark` job in `test` workflow. PR [#14974](https://github.com/fastapi/fastapi/pull/14974) by [@YuriiMotov](https://github.co | Low | 2/24/2026 |
| 0.132.0 | ### Breaking Changes * ๐๏ธ Add `strict_content_type` checking for JSON requests. PR [#14978](https://github.com/fastapi/fastapi/pull/14978) by [@tiangolo](https://github.com/tiangolo). * Now FastAPI checks, by default, that JSON requests have a `Content-Type` header with a valid JSON value, like `application/json`, and rejects requests that don't. * If the clients for your app don't send a valid `Content-Type` header you can disable this with `strict_content_type=False`. * Chec | Low | 2/23/2026 |
| 0.131.0 | ### Breaking Changes * ๐๏ธ Deprecate `ORJSONResponse` and `UJSONResponse`. PR [#14964](https://github.com/fastapi/fastapi/pull/14964) by [@tiangolo](https://github.com/tiangolo). | Low | 2/22/2026 |
| 0.130.0 | ### Features * โจ Serialize JSON response with Pydantic (in Rust), when there's a Pydantic return type or response model. PR [#14962](https://github.com/fastapi/fastapi/pull/14962) by [@tiangolo](https://github.com/tiangolo). * This results in 2x (or more) performance increase for JSON responses. * New docs: [Custom Response - JSON Performance](https://fastapi.tiangolo.com/advanced/custom-response/#json-performance). | Low | 2/22/2026 |
| 0.129.2 | ### Internal * โฌ๏ธ Upgrade pytest. PR [#14959](https://github.com/fastapi/fastapi/pull/14959) by [@tiangolo](https://github.com/tiangolo). * ๐ท Fix CI, do not attempt to publish `fastapi-slim`. PR [#14958](https://github.com/fastapi/fastapi/pull/14958) by [@tiangolo](https://github.com/tiangolo). * โ Drop support for `fastapi-slim`, no more versions will be released, use only `"fastapi[standard]"` or `fastapi`. PR [#14957](https://github.com/fastapi/fastapi/pull/14957) by [@tiangolo](https:/ | Low | 2/21/2026 |
| 0.129.1 | ### Fixes * โป๏ธ Fix JSON Schema for bytes, use `"contentMediaType": "application/octet-stream"` instead of `"format": "binary"`. PR [#14953](https://github.com/fastapi/fastapi/pull/14953) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐จ Add Kapa.ai widget (AI chatbot). PR [#14938](https://github.com/fastapi/fastapi/pull/14938) by [@tiangolo](https://github.com/tiangolo). * ๐ฅ Remove Python 3.9 specific files, no longer needed after updating translations. PR [#14931](https://gi | Low | 2/21/2026 |
| 0.129.0 | ### Breaking Changes * โ Drop support for Python 3.9. PR [#14897](https://github.com/fastapi/fastapi/pull/14897) by [@tiangolo](https://github.com/tiangolo). ### Refactors * ๐จ Update internal types for Python 3.10. PR [#14898](https://github.com/fastapi/fastapi/pull/14898) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐ Update highlights in webhooks docs. PR [#14905](https://github.com/fastapi/fastapi/pull/14905) by [@tiangolo](https://github.com/tiangolo). * ๐ Updat | Low | 2/12/2026 |
| 0.128.8 | ### Docs * ๐ Fix grammar in `docs/en/docs/tutorial/first-steps.md`. PR [#14708](https://github.com/fastapi/fastapi/pull/14708) by [@SanjanaS10](https://github.com/SanjanaS10). ### Internal * ๐จ Tweak PDM hook script. PR [#14895](https://github.com/fastapi/fastapi/pull/14895) by [@tiangolo](https://github.com/tiangolo). * โป๏ธ Update build setup for `fastapi-slim`, deprecate it, and make it only depend on `fastapi`. PR [#14894](https://github.com/fastapi/fastapi/pull/14894) by [@tiangolo | Low | 2/11/2026 |
| 0.128.7 | ### Features * โจ Show a clear error on attempt to include router into itself. PR [#14258](https://github.com/fastapi/fastapi/pull/14258) by [@JavierSanchezCastro](https://github.com/JavierSanchezCastro). * โจ Replace `dict` by `Mapping` on `HTTPException.headers`. PR [#12997](https://github.com/fastapi/fastapi/pull/12997) by [@rijenkii](https://github.com/rijenkii). ### Refactors * โป๏ธ Simplify reading files in memory, do it sequentially instead of (fake) parallel. PR [#14884](https://gi | Low | 2/10/2026 |
| 0.128.6 | ### Fixes * ๐ Fix `on_startup` and `on_shutdown` parameters of `APIRouter`. PR [#14873](https://github.com/fastapi/fastapi/pull/14873) by [@YuriiMotov](https://github.com/YuriiMotov). ### Translations * ๐ Update translations for zh (update-outdated). PR [#14843](https://github.com/fastapi/fastapi/pull/14843) by [@tiangolo](https://github.com/tiangolo). ### Internal * โ Fix parameterized tests with snapshots. PR [#14875](https://github.com/fastapi/fastapi/pull/14875) by [@YuriiMo | Low | 2/9/2026 |
| 0.128.5 | ### Refactors * โป๏ธ Refactor and simplify Pydantic v2 (and v1) compatibility internal utils. PR [#14862](https://github.com/fastapi/fastapi/pull/14862) by [@tiangolo](https://github.com/tiangolo). ### Internal * โ Add inline snapshot tests for OpenAPI before changes from Pydantic v2. PR [#14864](https://github.com/fastapi/fastapi/pull/14864) by [@tiangolo](https://github.com/tiangolo). | Low | 2/8/2026 |
| 0.128.4 | ### Refactors * โป๏ธ Refactor internals, simplify Pydantic v2/v1 utils, `create_model_field`, better types for `lenient_issubclass`. PR [#14860](https://github.com/fastapi/fastapi/pull/14860) by [@tiangolo](https://github.com/tiangolo). * โป๏ธ Simplify internals, remove Pydantic v1 only logic, no longer needed. PR [#14857](https://github.com/fastapi/fastapi/pull/14857) by [@tiangolo](https://github.com/tiangolo). * โป๏ธ Refactor internals, cleanup unneeded Pydantic v1 specific logic. PR [#14856]( | Low | 2/7/2026 |
| 0.128.3 | ### Refactors * โป๏ธ Re-implement `on_event` in FastAPI for compatibility with the next Starlette, while keeping backwards compatibility. PR [#14851](https://github.com/fastapi/fastapi/pull/14851) by [@tiangolo](https://github.com/tiangolo). ### Upgrades * โฌ๏ธ Upgrade Starlette supported version range to `starlette>=0.40.0,<1.0.0`. PR [#14853](https://github.com/fastapi/fastapi/pull/14853) by [@tiangolo](https://github.com/tiangolo). ### Translations * ๐ Update translations for ru ( | Low | 2/6/2026 |
| 0.128.2 | ### Features * โจ Add support for PEP695 `TypeAliasType`. PR [#13920](https://github.com/fastapi/fastapi/pull/13920) by [@cstruct](https://github.com/cstruct). * โจ Allow `Response` type hint as dependency annotation. PR [#14794](https://github.com/fastapi/fastapi/pull/14794) by [@jonathan-fulton](https://github.com/jonathan-fulton). ### Fixes * ๐ Fix using `Json[list[str]]` type (issue #10997). PR [#14616](https://github.com/fastapi/fastapi/pull/14616) by [@mkanetsuna](https://github.c | Low | 2/5/2026 |
| 0.128.1 | ### Features * โจ Add `viewport` meta tag to improve Swagger UI on mobile devices. PR [#14777](https://github.com/fastapi/fastapi/pull/14777) by [@Joab0](https://github.com/Joab0). * ๐ธ Improve error message for invalid query parameter type annotations. PR [#14479](https://github.com/fastapi/fastapi/pull/14479) by [@retwish](https://github.com/retwish). ### Fixes * ๐ Update `ValidationError` schema to include `input` and `ctx`. PR [#14791](https://github.com/fastapi/fastapi/pull/14791) | Low | 2/4/2026 |
| 0.128.0 | ### Breaking Changes * โ Drop support for `pydantic.v1`. PR [#14609](https://github.com/fastapi/fastapi/pull/14609) by [@tiangolo](https://github.com/tiangolo). ### Internal * โ Run performance tests only on Pydantic v2. PR [#14608](https://github.com/fastapi/fastapi/pull/14608) by [@tiangolo](https://github.com/tiangolo). | Low | 12/27/2025 |
| 0.127.1 | ### Refactors * ๐ Add a custom `FastAPIDeprecationWarning`. PR [#14605](https://github.com/fastapi/fastapi/pull/14605) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐ Add documentary to website. PR [#14600](https://github.com/fastapi/fastapi/pull/14600) by [@tiangolo](https://github.com/tiangolo). ### Translations * ๐ Update translations for de (update-outdated). PR [#14602](https://github.com/fastapi/fastapi/pull/14602) by [@nilslindemann](https://github.com/nilslind | Low | 12/26/2025 |
| 0.127.0 | ### Breaking Changes * ๐ Add deprecation warnings when using `pydantic.v1`. PR [#14583](https://github.com/fastapi/fastapi/pull/14583) by [@tiangolo](https://github.com/tiangolo). ### Translations * ๐ง Add LLM prompt file for Korean, generated from the existing translations. PR [#14546](https://github.com/fastapi/fastapi/pull/14546) by [@tiangolo](https://github.com/tiangolo). * ๐ง Add LLM prompt file for Japanese, generated from the existing translations. PR [#14545](https://github.c | Low | 12/21/2025 |
| 0.126.0 | ### Upgrades * โ Drop support for Pydantic v1, keeping short temporary support for Pydantic v2's `pydantic.v1`. PR [#14575](https://github.com/fastapi/fastapi/pull/14575) by [@tiangolo](https://github.com/tiangolo). * The minimum version of Pydantic installed is now `pydantic >=2.7.0`. * The `standard` dependencies now include `pydantic-settings >=2.0.0` and `pydantic-extra-types >=2.0.0`. ### Docs * ๐ Fix duplicated variable in `docs_src/python_types/tutorial005_py39.py`. PR | Low | 12/20/2025 |
| 0.125.0 | ### Breaking Changes * ๐ง Drop support for Python 3.8. PR [#14563](https://github.com/fastapi/fastapi/pull/14563) by [@tiangolo](https://github.com/tiangolo). * This would actually not be a _breaking_ change as no code would really break. Any Python 3.8 installer would just refuse to install the latest version of FastAPI and would only install 0.124.4. Only marking it as a "breaking change" to make it visible. ### Refactors * โป๏ธ Upgrade internal syntax to Python 3.9+ ๐. PR [#14564 | Low | 12/17/2025 |
| 0.124.4 | ### Fixes * ๐ Fix parameter aliases. PR [#14371](https://github.com/fastapi/fastapi/pull/14371) by [@YuriiMotov](https://github.com/YuriiMotov). | Low | 12/12/2025 |
| 0.124.3 | ### Fixes * ๐ Fix support for tagged union with discriminator inside of `Annotated` with `Body()`. PR [#14512](https://github.com/fastapi/fastapi/pull/14512) by [@tiangolo](https://github.com/tiangolo). ### Refactors * โ Add set of tests for request parameters and alias. PR [#14358](https://github.com/fastapi/fastapi/pull/14358) by [@YuriiMotov](https://github.com/YuriiMotov). ### Docs * ๐ Tweak links format. PR [#14505](https://github.com/fastapi/fastapi/pull/14505) by [@tiango | Low | 12/12/2025 |
| 0.124.2 | ### Fixes * ๐ Fix support for `if TYPE_CHECKING`, non-evaluated stringified annotations. PR [#14485](https://github.com/fastapi/fastapi/pull/14485) by [@tiangolo](https://github.com/tiangolo). | Low | 12/10/2025 |
| 0.124.1 | ### Fixes * ๐ Fix handling arbitrary types when using `arbitrary_types_allowed=True`. PR [#14482](https://github.com/fastapi/fastapi/pull/14482) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐ Add variants for code examples in "Advanced User Guide". PR [#14413](https://github.com/fastapi/fastapi/pull/14413) by [@YuriiMotov](https://github.com/YuriiMotov). * ๐ Update tech stack in project generation docs. PR [#14472](https://github.com/fastapi/fastapi/pull/14472) by [@alejs | Low | 12/10/2025 |
| 0.124.0 | ### Features * ๐ธ Improve tracebacks by adding endpoint metadata. PR [#14306](https://github.com/fastapi/fastapi/pull/14306) by [@savannahostrowski](https://github.com/savannahostrowski). ### Internal * โ๏ธ Fix typo in `scripts/mkdocs_hooks.py`. PR [#14457](https://github.com/fastapi/fastapi/pull/14457) by [@yujiteshima](https://github.com/yujiteshima). | Low | 12/6/2025 |
| 0.123.10 | ### Fixes * ๐ Fix using class (not instance) dependency that has `__call__` method. PR [#14458](https://github.com/fastapi/fastapi/pull/14458) by [@YuriiMotov](https://github.com/YuriiMotov). * ๐ Fix `separate_input_output_schemas=False` with `computed_field`. PR [#14453](https://github.com/fastapi/fastapi/pull/14453) by [@YuriiMotov](https://github.com/YuriiMotov). | Low | 12/5/2025 |
| 0.123.9 | ### Fixes * ๐ Fix OAuth2 scopes in OpenAPI in extra corner cases, parent dependency with scopes, sub-dependency security scheme without scopes. PR [#14459](https://github.com/fastapi/fastapi/pull/14459) by [@tiangolo](https://github.com/tiangolo). | Low | 12/4/2025 |
| 0.123.8 | ### Fixes * ๐ Fix OpenAPI security scheme OAuth2 scopes declaration, deduplicate security schemes with different scopes. PR [#14455](https://github.com/fastapi/fastapi/pull/14455) by [@tiangolo](https://github.com/tiangolo). | Low | 12/4/2025 |
| 0.123.7 | ### Fixes * ๐ Fix evaluating stringified annotations in Python 3.10. PR [#11355](https://github.com/fastapi/fastapi/pull/11355) by [@chaen](https://github.com/chaen). | Low | 12/4/2025 |
| 0.123.6 | ### Fixes * ๐ Fix support for functools wraps and partial combined, for async and regular functions and classes in path operations and dependencies. PR [#14448](https://github.com/fastapi/fastapi/pull/14448) by [@tiangolo](https://github.com/tiangolo). | Low | 12/4/2025 |
| 0.123.5 | ### Features * โจ Allow using dependables with `functools.partial()`. PR [#9753](https://github.com/fastapi/fastapi/pull/9753) by [@lieryan](https://github.com/lieryan). * โจ Add support for wrapped functions (e.g. `@functools.wraps()`) used with forward references. PR [#5077](https://github.com/fastapi/fastapi/pull/5077) by [@lucaswiman](https://github.com/lucaswiman). * โจ Handle wrapped dependencies. PR [#9555](https://github.com/fastapi/fastapi/pull/9555) by [@phy1729](https://github.com/p | Low | 12/2/2025 |
| 0.123.4 | ### Fixes * ๐ Fix OpenAPI schema support for computed fields when using `separate_input_output_schemas=False`. PR [#13207](https://github.com/fastapi/fastapi/pull/13207) by [@vgrafe](https://github.com/vgrafe). ### Docs * ๐ Fix docstring of `servers` parameter. PR [#14405](https://github.com/fastapi/fastapi/pull/14405) by [@YuriiMotov](https://github.com/YuriiMotov). | Low | 12/2/2025 |
| 0.123.3 | ### Fixes * ๐ Fix Query\Header\Cookie parameter model alias. PR [#14360](https://github.com/fastapi/fastapi/pull/14360) by [@YuriiMotov](https://github.com/YuriiMotov). * ๐ Fix optional sequence handling in `serialize sequence value` with Pydantic V2. PR [#14297](https://github.com/fastapi/fastapi/pull/14297) by [@YuriiMotov](https://github.com/YuriiMotov). | Low | 12/2/2025 |
| 0.123.2 | ### Fixes * ๐ Fix unformatted `{type_}` in FastAPIError. PR [#14416](https://github.com/fastapi/fastapi/pull/14416) by [@Just-Helpful](https://github.com/Just-Helpful). * ๐ Fix parsing extra non-body parameter list. PR [#14356](https://github.com/fastapi/fastapi/pull/14356) by [@YuriiMotov](https://github.com/YuriiMotov). * ๐ Fix parsing extra `Form` parameter list. PR [#14303](https://github.com/fastapi/fastapi/pull/14303) by [@YuriiMotov](https://github.com/YuriiMotov). * ๐ Fix suppo | Low | 12/2/2025 |
| 0.123.1 | ### Fixes * ๐ Avoid accessing non-existing "$ref" key for Pydantic v2 compat remapping. PR [#14361](https://github.com/fastapi/fastapi/pull/14361) by [@svlandeg](https://github.com/svlandeg). * ๐ Fix `TypeError` when encoding a decimal with a `NaN` or `Infinity` value. PR [#12935](https://github.com/fastapi/fastapi/pull/12935) by [@kentwelcome](https://github.com/kentwelcome). ### Internal * ๐ Fix Windows UnicodeEncodeError in CLI test. PR [#14295](https://github.com/fastapi/fastapi | Low | 12/2/2025 |
| 0.123.0 | ### Fixes * ๐ Cache dependencies that don't use scopes and don't have sub-dependencies with scopes. PR [#14419](https://github.com/fastapi/fastapi/pull/14419) by [@tiangolo](https://github.com/tiangolo). | Low | 11/30/2025 |
| 0.122.1 | ### Fixes * ๐ Fix hierarchical security scope propagation. PR [#5624](https://github.com/fastapi/fastapi/pull/5624) by [@kristjanvalur](https://github.com/kristjanvalur). ### Docs * ๐ Update CSS to explicitly use emoji font. PR [#14415](https://github.com/fastapi/fastapi/pull/14415) by [@tiangolo](https://github.com/tiangolo). ### Internal * โฌ Bump markdown-include-variants from 0.0.5 to 0.0.6. PR [#14418](https://github.com/fastapi/fastapi/pull/14418) by [@YuriiMotov](https://g | Low | 11/30/2025 |
| 0.122.0 | ### Fixes * ๐ Use `401` status code in security classes when credentials are missing. PR [#13786](https://github.com/fastapi/fastapi/pull/13786) by [@YuriiMotov](https://github.com/YuriiMotov). * If your code depended on these classes raising the old (less correct) `403` status code, check the new docs about how to override the classes, to use the same old behavior: [Use Old 403 Authentication Error Status Codes](https://fastapi.tiangolo.com/how-to/authentication-error-status-code/). | Low | 11/24/2025 |
| 0.121.3 | ## 0.121.3 ### Refactors * โป๏ธ Make the result of `Depends()` and `Security()` hashable, as a workaround for other tools interacting with these internal parts. PR [#14372](https://github.com/fastapi/fastapi/pull/14372) by [@tiangolo](https://github.com/tiangolo). ### Upgrades * โฌ๏ธ Bump Starlette to <`0.51.0`. PR [#14282](https://github.com/fastapi/fastapi/pull/14282) by [@musicinmybrain](https://github.com/musicinmybrain). ### Docs * ๐ Add missing hash part. PR [#14369](https:/ | Low | 11/19/2025 |
| 0.121.2 | ### Fixes * ๐ Fix handling of JSON Schema attributes named "$ref". PR [#14349](https://github.com/fastapi/fastapi/pull/14349) by [@tiangolo](https://github.com/tiangolo). ### Docs * ๐ Add EuroPython talk & podcast episode with Sebastiรกn Ramรญrez. PR [#14260](https://github.com/fastapi/fastapi/pull/14260) by [@clytaemnestra](https://github.com/clytaemnestra). * โ๏ธ Fix links and add missing permalink in docs. PR [#14217](https://github.com/fastapi/fastapi/pull/14217) by [@YuriiMotov](ht | Low | 11/13/2025 |
| 0.121.1 | ### Fixes * ๐ Fix `Depends(func, scope='function')` for top level (parameterless) dependencies. PR [#14301](https://github.com/fastapi/fastapi/pull/14301) by [@luzzodev](https://github.com/luzzodev). ### Docs * ๐ Upate docs for advanced dependencies with `yield`, noting the changes in 0.121.0, adding `scope`. PR [#14287](https://github.com/fastapi/fastapi/pull/14287) by [@tiangolo](https://github.com/tiangolo). ### Internal * โฌ Bump ruff from 0.13.2 to 0.14.3. PR [#14276](https: | Low | 11/8/2025 |
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