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The desktop workflow needs neither an account nor remote deployment. It helps development and testing proceed without depending on a real service's availability, cost or rate limits.\n\n## Mock servers and responses\nCreate multiple local servers and routes, choose HTTP methods and status codes, set custom headers, serve files and generate JSON with templating helpers. Response rules support realistic scenarios and error cases. HTTPS, proxy forwarding and incoming\u002Fforwarded request logs help inspect integrations. OpenAPI import connects the mock design to an API specification.\n\n## Editing and testing\nMockoon 9.6 introduced OpenAPI re-import for adding routes and responses to existing mocks. Most configuration edits apply immediately; TLS settings and hostname\u002Fport changes still require a restart. Its routing migration has compatibility caveats for some older regular-expression paths. Version 9.6.1 fixes the broken macOS builds in 9.6.0.\n\n## Desktop versus deployment services\nThis Homebrew cask installs Mockoon.app, not the separate npm CLI. The official CLI and Docker image run mocks in headless or CI environments. Mockoon Cloud is a separate subscription service with collaboration, synchronization and deployments; cloud functionality should not be confused with the free local desktop workflow. The legacy @mockoon\u002Fserverless library is deprecated.\n\n## macOS distribution and security\nThe recorded 9.9.0 cask provides an Apple-silicon arm64 DMG and a separate Intel build, requiring macOS 13 or later. Install using `brew install --cask mockoon`. The 9.9.0 release fixes a multipart form-data prototype-pollution vulnerability (GHSA-cmwm-hp2w-h3cx); upstream recommends updating when mocks process untrusted requests or are publicly exposed.\n\n## Sources\n- [Official repository and README](https:\u002F\u002Fgithub.com\u002Fmockoon\u002Fmockoon)\n- [Official documentation](https:\u002F\u002Fmockoon.com\u002Fdocs\u002Flatest\u002Fabout\u002F)\n- [Official 9.9.0 changelog](https:\u002F\u002Fmockoon.com\u002Freleases\u002F9.9.0\u002F)\n- [Homebrew cask](https:\u002F\u002Fgithub.com\u002FHomebrew\u002Fhomebrew-cask\u002Fblob\u002FHEAD\u002FCasks\u002Fm\u002Fmockoon.rb)\n","Create mock APIs in seconds","Mockoon","d1bd3440620694fa2ac433a1c0723bbfc79b3ba5d8884de3a82eee419b54a826",139913325,"https:\u002F\u002Fgithub.com\u002Fmockoon\u002Fmockoon\u002Freleases\u002Fdownload\u002Fv9.9.0\u002Fmockoon.setup.9.9.0.arm64.dmg","https:\u002F\u002Fformulae.brew.sh\u002Fcask\u002Fmockoon","https:\u002F\u002Fmockoon.com\u002F","https:\u002F\u002Fcdn.opennavo.com\u002Ficons\u002Fuploads\u002F47bc851c994d\u002F1ba0cf40177c-256.png","brew install --cask mockoon",{"d30":63,"d365":64,"d90":65},205,5654,900,"cask",{"bodyMarkdown":68,"hasNotes":30,"id":69,"isLatest":30,"isPrerelease":34,"machineTranslated":34,"publishedAt":70,"sections":71,"source":79,"sourceLocale":80,"summary":81,"title":82,"translation":83,"version":85},"Welcome to this new release of Mockoon. It brings support for connecting to a self-hosted API in the future, WebSocket support in Mockoon Cloud, a smarter CRUD auto-generated ID strategy, Content-Type charset override, and several bug fixes and improvements.\nRead on to learn more about this release.\n\n\n Support us!\n\nMockoon is proudly independent and open-source, maintained without external funding. We rely on both sponsorships and Mockoon Cloud subscriptions to keep improving the project and building new features. A big thank you to the companies below for supporting our work and helping us grow (and all the sponsors who helped this project over time!):\n\n      \n        \n      \n    \n      \n        \n      \n    \n      \n        \n      \n    \n\nIf you'd like to support Mockoon as well, you can become a sponsor or subscribe to Mockoon Cloud. Every contribution helps keep the project alive and evolving. Thank you!\n\n      \n        \n      \n    \n      \n        \n      \n    \n\n WebSocket support in Mockoon Cloud\n\nAs part of the work on the self-hosted backend (see below), Mockoon Cloud now supports WebSocket endpoints. They work similarly to their local counterparts, allowing real-time communication between clients and the server.\n\nHead over to the WebSocket documentation to learn more about how to set up and use WebSocket endpoints in Mockoon.\n\n(PR #2354)\n\n Deprecation of the @mockoon\u002Fserverless library\n\nThe @mockoon\u002Fserverless package is now formally deprecated and will no longer receive new feature updates.\n\nWe recommend using the official Mockoon CLI Docker image instead when running mocks on serverless platforms such as AWS Lambda or Google Cloud Run. We plan to remove the @mockoon\u002Fserverless package entirely in a future major release.\n\n(Issue #2079)\n\n Preparation for self-hosted API\n\nThe desktop and web applications have been updated to support connecting to a self-hosted Mockoon backend.\n\nWe announced earlier this year that self-hosting would be our focus for the rest of 2026.\n\nNothing to see yet, but a self-hosted backend supporting Mockoon Cloud features will soon be available as a paid product. Stay tuned for more updates as development progresses.\n\n(PR #2354)\n\n Improvements\n\n\n\n\nMockoon now respects explicit Content-Type header definitions on your responses without automatically forcing a charset=utf-8 suffix, giving you full control over response headers and non-UTF-8 payload encodings. More details can be found in the response headers documentation. (Issue #539)\n\n\n\n\nWhen opening an environment via custom protocol (mockoon:\u002F\u002F), the application now prompts for the destination save path before fetching the remote file, making remote imports clearer and providing smoother cancellation handling. (PR #2341)\n\n\n\n\nThe Logs tab search has been enhanced to include request and response bodies as well as headers, alongside the URL path, HTTP method, and status code. This makes debugging much easier when working with identical URLs (such as GraphQL endpoints) or searching for specific headers and payload properties without having to manually inspect every logged transaction. (Issue #1881)\n\n\n\n\nWhen importing an OpenAPI specification that contains remote $ref references, Mockoon will now warn you before dereferencing and fetching external URLs, listing the target endpoints for greater visibility and security. In addition, a new CLI flag has been added to disable remote URL dereferencing during automated OpenAPI imports: --disable-external-refs. (Issue #2339)\n\n\n\n\nCRUD routes now detect the format and templating helpers used for existing item IDs in your data bucket (such as UUIDs, auto-incrementing numbers, or helpers like {{faker 'database.mongodbObjectId'}}) and automatically reuse that strategy when auto-generating new record IDs upon POST requests. Read more in the CRUD routes documentation. (Issue #1547)\n\n\n\n Fixes\n\n\nFixed an issue where templated file paths in responses were erroneously blocked by path traversal checks. (Issue #2319)\n\nFixed an issue where non-TLS HTTP\u002F2 requests with upgrade headers failed with an Invalid WebSocket upgrade request error when WebSocket routes were defined. (Issue #1908)\n\nFixed an issue where the Secure cookie flag was not removed when proxying HTTPS services over plain HTTP. (Issue #611)\n\nRemoved the append-field dependency and improved multipart form-data parsing with nested\u002Findexed fields handling and prototype pollution protection. A prototype pollution vulnerability was fixed where specially crafted multipart form-data field names could modify Object prototype properties on the server runtime. We recommend updating to this version as soon as possible if your mocks process untrusted requests or are exposed publicly. This vulnerability was disclosed in GHSA-cmwm-hp2w-h3cx. Read our security update. (PR #2355)\n\n\n Chores\n\n\nMigrated automated end-to-end desktop test mocking to WDIO Electron mocks. (PR #2258)\n\nUpdated application and library dependencies to their latest versions. (PR #2356)\n\nGitHub release notice:\n[Full changelog](https:\u002F\u002Fmockoon.com\u002Freleases\u002F9.9.0\u002F)\n\nSource: https:\u002F\u002Fmockoon.com\u002Freleases\u002F9.9.0\u002F\nOfficial release: https:\u002F\u002Fgithub.com\u002Fmockoon\u002Fmockoon\u002Freleases\u002Ftag\u002Fv9.9.0",1475,"2026-09-16T08:00:31Z",[72],{"area":73,"items":74},"Changes",[75,76,77,78],"Fixes multipart form-data prototype pollution (GHSA-cmwm-hp2w-h3cx).","Searches request and response bodies and headers in Logs.","Reuses existing CRUD ID strategies and respects explicit Content-Type.","Warns before fetching remote OpenAPI references.","editorial","en-US","Fixes multipart prototype pollution, improves log search and CRUD ID generation, respects Content-Type charsets, and adds OpenAPI remote-reference warnings.","Mockoon 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