SDK & code generation

66 distinct extensions were invented to do this job. Each one is a provider deciding OpenAPI would not carry something and building their own way through. Where a job has many names and few uses each, nobody won — the problem was solved privately, over and over.

66 extensions
37775 occurrences
16 vendor-named

The extensions

ExtensionWhat it appears to doUsesProviders
x-go-name `x-go-name` appears on schema objects and properties. Its value is a string. Used by 19 providers across 55 OpenAPI documents. Observed values include `Name`, `Json`, `Profile`, `UIDToken`. Consistent 11174 19
x-codeSamples `x-codeSamples` appears on operations. Its value is a list. Used by 94 providers across 207 OpenAPI documents. Observed values include `*ref_0`, `*ref_1`, `&ref_0`, `&ref_1`. Consistent with sdk & cod 6343 94
x-codegen-request-body-name `x-codegen-request-body-name` appears on operations. Its value is a string. Used by 79 providers across 153 OpenAPI documents. Observed values include `body`, `search`, `policy`, `Article`. Consistent 4368 79
x-ms-client-name
vendor
`x-ms-client-name` appears on header objects and on parameter objects. Its value is a string. Used by 7 providers across 147 OpenAPI documents. It sits in the `x-ms-` namespace, so its meaning is defi 3616 7
x-code-samples `x-code-samples` appears on operations. Its value is a list. Used by 19 providers across 24 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where the key appears and w 2345 19
x-go-package `x-go-package` appears on schema objects and properties. Its value is a string. Used by 8 providers across 22 OpenAPI documents. Observed values include `akeyless.io/akeyless-main-repo/go/src/client/c 2054 8
x-exportParamName `x-exportParamName` appears on operations. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `Body`, `Limit`, `Offset`, `Q`. Consistent with sdk & cod 1226 1
x-fern-sdk-group-name
vendor
`x-fern-sdk-group-name` appears on operations. Its value is a string. Used by 6 providers across 32 OpenAPI documents. It sits in the `x-fern-` namespace, so its meaning is defined by fern tooling rat 846 6
x-fern-sdk-method-name
vendor
`x-fern-sdk-method-name` appears on operations. Its value is a string. Used by 6 providers across 32 OpenAPI documents. It sits in the `x-fern-` namespace, so its meaning is defined by fern tooling ra 846 6
x-do-not-generate `x-do-not-generate` appears on schema objects and properties. Its value is a boolean flag. Used by a single provider across 1 OpenAPI document. Consistent with sdk & code generation — this is inferred 648 1
x-omitempty `x-omitempty` appears on schema objects and properties. Its value is a boolean flag. Used by 15 providers across 18 OpenAPI documents. Consistent with sdk & code generation — this is inferred from whe 536 15
x-ds-in-sdk
vendor
`x-ds-in-sdk` appears on operations. Its value is a boolean flag. Used by a single provider across 6 OpenAPI documents. It sits in the `x-ds-` namespace, so its meaning is defined by ds tooling rather 484 1
x-ds-methodname
vendor
`x-ds-methodname` appears on operations. Its value is a string. Used by a single provider across 6 OpenAPI documents. It sits in the `x-ds-` namespace, so its meaning is defined by ds tooling rather t 484 1
x-oapi-codegen-extra-tags `x-oapi-codegen-extra-tags` appears on schema objects and properties. Its value is a structured object. Used by 8 providers across 9 OpenAPI documents. Consistent with sdk & code generation — this is 426 8
x-no-merge `x-no-merge` appears on operations. Its value is a boolean flag. Used by a single provider across 17 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where the key appe 424 1
x-methodName `x-methodName` appears on operations. Its value is a string. Used by a single provider across 23 OpenAPI documents. Observed values include `cancelOrder`, `getTerminalLogo`, `getTerminalSettings`, `up 385 1
x-snake `x-snake` appears on parameter objects. Its value is a string. Used by a single provider across 9 OpenAPI documents. Observed values include `employee_id`, `timesheet_id`, `project_id`, `if_modified_s 331 1
x-python-method-name `x-python-method-name` appears on operations. Its value is a string. Used by 2 providers across 2 OpenAPI documents. Observed values include `get`, `list`, `create`, `update`. Consistent with sdk & co 182 2
x-java-method-name `x-java-method-name` appears on operations. Its value is a string. Used by 2 providers across 2 OpenAPI documents. Observed values include `get`, `list`, `create`, `update`. Consistent with sdk & code 160 2
x-oracle-package
vendor
`x-oracle-package` appears at the root of the document. Its value is a string. Used by a single provider across 136 OpenAPI documents. It sits in the `x-oracle-` namespace, so its meaning is defined b 136 1
x-go-type-import `x-go-type-import` appears on schema objects and properties. Its value is a structured object. Used by 10 providers across 15 OpenAPI documents. Consistent with sdk & code generation — this is inferre 99 10
x-namespaced-enum `x-namespaced-enum` appears on schema objects and properties. Its value is a list. Used by 3 providers across 9 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where t 82 3
x-sdk-methodName `x-sdk-methodName` appears on operations. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `getAccountDetails`, `updateAccount`, `getAccountPhysicalA 82 1
x-sq-sdk-sample-code
vendor
`x-sq-sdk-sample-code` appears on schema objects and properties. Its value is a structured object. Used by a single provider across 1 OpenAPI document. It sits in the `x-sq-` namespace, so its meaning 67 1
x-java-type `x-java-type` appears on schema objects and properties. Its value is a string. Used by 2 providers across 9 OpenAPI documents. Observed values include `java.math.BigDecimal`, `java.time.Instant`, `Htt 64 2
x-jvm-package `x-jvm-package` appears on operations. Its value is a string. Used by a single provider across 6 OpenAPI documents. Observed values include `registry`, `utility`, `transfer_instruction`, `allocation`. 60 1
x-codegen `x-codegen` appears on operations. Its value is a structured object. Used by 2 providers across 2 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where the key appears 40 2
x-ruby-regexp `x-ruby-regexp` appears on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `(?-mix:\A[[:alpha:]\s‘’`'-]*\z)`, `(?-mix 34 1
x-fern-sdk-variable
vendor
`x-fern-sdk-variable` appears on path items. Its value is a string. Used by a single provider across 1 OpenAPI document. It sits in the `x-fern-` namespace, so its meaning is defined by fern tooling r 32 1
x-toBuilder `x-toBuilder` appears on schema objects and properties. Its value is a boolean flag. Used by a single provider across 5 OpenAPI documents. Consistent with sdk & code generation — this is inferred from 31 1
x-skip-camel-case-check `x-skip-camel-case-check` appears on schema objects and properties. Its value is a boolean flag. Used by a single provider across 1 OpenAPI document. Consistent with sdk & code generation — this is in 18 1
x-bingapis-sdk `x-bingapis-sdk` appears on parameter objects. Its value is a structured object. Used by 2 providers across 14 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where th 14 2
x-python-type `x-python-type` appears on schema objects and properties. Its value is a string. Used by a single provider across 2 OpenAPI documents. Observed values include `Dict[str, object]`, `FileStorage`. Consi 14 1
x-csharp-usage `x-csharp-usage` appears on schema objects and properties. Its value is a string. Used by a single provider across 4 OpenAPI documents. Observed values include `output`, `input,output`. Consistent wit 12 1
x-sdk-repo `x-sdk-repo` appears on operations. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `https://github.com/wordnik/wordnik-clients`. Consistent with sd 12 1
x-sdk-exclude `x-sdk-exclude` appears on schema objects and properties and on operations. Its value is a boolean flag. Used by a single provider across 4 OpenAPI documents. Consistent with sdk & code generation — t 11 1
x-factset-sdk-ignore `x-factset-sdk-ignore` appears on operations. Its value is a boolean flag. Used by a single provider across 3 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where the 10 1
x-exclude-from-codegen `x-exclude-from-codegen` appears on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `true`. Consistent with sdk & cod 9 1
x-keep-sdk `x-keep-sdk` appears on operations. Its value is a boolean flag. Used by a single provider across 2 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where the key appea 8 1
x-fern-sdk-return-value
vendor
`x-fern-sdk-return-value` appears on operations. Its value is a string. Used by a single provider across 1 OpenAPI document. It sits in the `x-fern-` namespace, so its meaning is defined by fern tooli 7 1
x-codegen-package `x-codegen-package` appears on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `io.apicurio.registry.types`. Consiste 6 1
x-jave-method-name `x-jave-method-name` appears on operations. Its value is a string. Used by 2 providers across 2 OpenAPI documents. Observed values include `get`. Consistent with sdk & code generation — this is inferr 6 2
x-apideck-sdk-support
vendor
`x-apideck-sdk-support` appears in the info block. Its value is a boolean flag. Used by a single provider across 4 OpenAPI documents. It sits in the `x-apideck-` namespace, so its meaning is defined b 4 1
x-java-method `x-java-method` appears on operations. Its value is a string. Used by 2 providers across 2 OpenAPI documents. Observed values include `put`. Consistent with sdk & code generation — this is inferred fr 4 2
x-namespace `x-namespace` appears in the info block. Its value is a string. Used by 2 providers across 3 OpenAPI documents. Observed values include `Microsoft.Dynamics.CRM`, `now`, `sn_ind_tsm_sdwan`. Consistent 3 2
x-builder `x-builder` appears on schema objects and properties. Its value is a boolean flag. Used by a single provider across 1 OpenAPI document. Consistent with sdk & code generation — this is inferred from wh 2 1
x-client-name `x-client-name` appears on parameter objects. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `BoundingBoxTopLeft`, `BoundingBoxBottomRight`. Consis 2 1
x-codegen-inline `x-codegen-inline` appears on schema objects and properties. Its value is a boolean flag. Used by a single provider across 1 OpenAPI document. Consistent with sdk & code generation — this is inferred 2 1
x-codegen-settings `x-codegen-settings` appears in the info block. Its value is a structured object. Used by 2 providers across 2 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where th 2 2
x-ms-namespace-enabled
vendor
`x-ms-namespace-enabled` appears on header objects. Its value is a structured object. Used by a single provider across 1 OpenAPI document. It sits in the `x-ms-` namespace, so its meaning is defined b 2 1
x-oaiSupportedSDKs `x-oaiSupportedSDKs` appears on schema objects and properties. Its value is a list. Used by 2 providers across 2 OpenAPI documents. Consistent with sdk & code generation — this is inferred from where 2 2
x-php-format `x-php-format` appears on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `\DateTime`. Consistent with sdk & code gen 2 1
x-skip-codegen-attr `x-skip-codegen-attr` appears in components. Its value is a string. Used by a single provider across 2 OpenAPI documents. Observed values include `description`. Consistent with sdk & code generation — 2 1
x-stainless-python-custom-imports
vendor
`x-stainless-python-custom-imports` appears on schema objects and properties. Its value is a list. Used by 2 providers across 2 OpenAPI documents. It sits in the `x-stainless-` namespace, so its meani 2 2
x-stainless-python-extend-union
vendor
`x-stainless-python-extend-union` appears on schema objects and properties. Its value is a list. Used by 2 providers across 2 OpenAPI documents. It sits in the `x-stainless-` namespace, so its meaning 2 2
x-stainless-python-extend-union-imports
vendor
`x-stainless-python-extend-union-imports` appears on schema objects and properties. Its value is a list. Used by 2 providers across 2 OpenAPI documents. It sits in the `x-stainless-` namespace, so its 2 2
x-code-sample `x-code-sample` appears on operations. Its value is a list. Used by a single provider across 1 OpenAPI document. Consistent with sdk & code generation — this is inferred from where the key appears and 1 1
x-codegen-contextRoot `x-codegen-contextRoot` appears on path items. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `/apis/registry/v3`. Consistent with sdk & code gener 1 1
x-codegen-extendsClass `x-codegen-extendsClass` appears on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `io.apicurio.registry.rest.v3.bea 1 1
x-codegen-type `x-codegen-type` appears on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `StringMap`. Consistent with sdk & code g 1 1
x-fern-sdk-variables
vendor
`x-fern-sdk-variables` appears at the root of the document. Its value is a structured object. Used by a single provider across 1 OpenAPI document. It sits in the `x-fern-` namespace, so its meaning is 1 1
x-java-package `x-java-package` appears in the info block. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `net.thetadata.generated`. Consistent with sdk & code ge 1 1
x-obmcs-sdk-identifier-renaming-config
vendor
`x-obmcs-sdk-identifier-renaming-config` appears at the root of the document. Its value is a structured object. Used by a single provider across 1 OpenAPI document. It sits in the `x-obmcs-` namespace 1 1
x-python-examples-extra-imports `x-python-examples-extra-imports` appears on operations. Its value is a list. Used by a single provider across 1 OpenAPI document. Observed values include `["sys"]`. Consistent with sdk & code generat 1 1
x-sdk-id `x-sdk-id` appears in the info block. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `analytics-public-api`. Consistent with sdk & code generation 1 1
x-sdk-name `x-sdk-name` appears in the info block. Its value is a string. Used by a single provider across 1 OpenAPI document. Observed values include `analytics_public_api`. Consistent with sdk & code generatio 1 1

Work with this as data

Every extension here is available over the APIs.io API and to AI agents over MCP. OpenAPI Extensions is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for openapi extensions

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
Search the catalog
curl "https://apis.io/api/v1/search?q=sdk-code-generation&limit=10"
Everything under a tag
curl "https://apis.io/api/v1/tags/sdk-code-generation"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

A second provider on the same verified email joins the account you already have.