# swagger-typescript-api - Support for OpenAPI 3.0, 2.0, JSON and YAML - Generate the API Client for Fetch or Axios from an OpenAPI Specification Any questions you can ask [**here**](https://github.com/acacode/swagger-typescript-api/discussions) ## Examples All examples you can find [**here**](https://github.com/acacode/swagger-typescript-api/tree/main/tests) ## Usage ```muse Usage: sta [options] Usage: swagger-typescript-api [options] Usage: swagger-typescript-api generate-templates [options] Options: -v, --version output the current version -p, --path path/url to swagger scheme -o, --output output path of typescript api file (default: "./") -n, --name name of output typescript api file (default: "Api.ts") -t, --templates path to folder containing templates -d, --default-as-success use "default" response status code as success response too. some swagger schemas use "default" response status code as success response type by default. (default: false) -r, --responses generate additional information about request responses also add typings for bad responses (default: false) --union-enums generate all "enum" types as union types (T1 | T2 | TN) (default: false) --add-readonly generate readonly properties (default: false) --route-types generate type definitions for API routes (default: false) --no-client do not generate an API class --enum-names-as-values use values in 'x-enumNames' as enum values (not only as keys) (default: false) --extract-request-params extract request params to data contract (Also combine path params and query params into one object) (default: false) --extract-request-body extract request body type to data contract (default: false) --extract-response-body extract response body type to data contract (default: false) --extract-response-error extract response error type to data contract (default: false) --modular generate separated files for http client, data contracts, and routes (default: false) --js generate js api module with declaration file (default: false) --module-name-index determines which path index should be used for routes separation (example: GET:/fruits/getFruit -> index:0 -> moduleName -> fruits) (default: 0) --module-name-first-tag splits routes based on the first tag (default: false) --disableStrictSSL disabled strict SSL (default: false) --disableProxy disabled proxy (default: false) --axios generate axios http client (default: false) --unwrap-response-data unwrap the data item from the response (default: false) --disable-throw-on-error Do not throw an error when response.ok is not true (default: false) --single-http-client Ability to send HttpClient instance to Api constructor (default: false) --silent Output only errors to console (default: false) --default-response default type for empty response schema (default: "void") --type-prefix data contract name prefix (default: "") --type-suffix data contract name suffix (default: "") --clean-output clean output folder before generate api. WARNING: May cause data loss (default: false) --api-class-name name of the api class (default: "Api") --patch fix up small errors in the swagger source definition (default: false) --debug additional information about processes inside this tool (default: false) --another-array-type generate array types as Array (by default Type[]) (default: false) --sort-types sort fields and types (default: false) --sort-routes sort routes in alphabetical order (default: false) --custom-config custom config: primitiveTypeConstructs, hooks, ... (default: "") --extract-enums extract all enums from inline interface\type content to typescript enum construction (default: false) -h, --help display help for command Commands: generate-templates Generate ".ejs" templates needed for generate api -o, --output output path of generated templates -m, --modular generate templates needed to separate files for http client, data contracts, and routes (default: false) --http-client http client type (possible values: "fetch", "axios") (default: "fetch") -c, --clean-output clean output folder before generate template. WARNING: May cause data loss (default: false) -r, --rewrite rewrite content in existing templates (default: false) --silent Output only errors to console (default: false) -h, --help display help for command ``` Also you can use `npx`: ``` npx swagger-typescript-api -p ./swagger.json -o ./src -n myApi.ts ``` You can use this package from nodejs: ```js import fs from "node:fs"; import path from "node:path"; import { generateApi, generateTemplates } from "swagger-typescript-api"; /* NOTE: all fields are optional expect one of `input`, `url`, `spec` */ generateApi({ name: "MySuperbApi.ts", // set to `false` to prevent the tool from writing to disk output: path.resolve(process.cwd(), "./src/__generated__"), url: "http://api.com/swagger.json", input: path.resolve(process.cwd(), "./foo/swagger.json"), spec: { swagger: "2.0", info: { version: "1.0.0", title: "Swagger Petstore", }, // ... }, templates: path.resolve(process.cwd(), "./api-templates"), httpClientType: "axios", // or "fetch" defaultResponseAsSuccess: false, generateClient: true, generateRouteTypes: false, generateResponses: true, toJS: false, extractRequestParams: false, extractRequestBody: false, extractEnums: false, unwrapResponseData: false, prettier: { // By default prettier config is load from your project printWidth: 120, tabWidth: 2, trailingComma: "all", parser: "typescript", }, defaultResponseType: "void", singleHttpClient: true, cleanOutput: false, enumNamesAsValues: false, moduleNameFirstTag: false, generateUnionEnums: false, typePrefix: "", typeSuffix: "", enumKeyPrefix: "", enumKeySuffix: "", addReadonly: false, sortTypes: false, sortRouters: false, extractingOptions: { requestBodySuffix: ["Payload", "Body", "Input"], requestParamsSuffix: ["Params"], responseBodySuffix: ["Data", "Result", "Output"], responseErrorSuffix: [ "Error", "Fail", "Fails", "ErrorData", "HttpError", "BadResponse", ], }, /** allow to generate extra files based with this extra templates, see more below */ extraTemplates: [], anotherArrayType: false, fixInvalidTypeNamePrefix: "Type", fixInvalidEnumKeyPrefix: "Value", codeGenConstructs: (constructs) => ({ ...constructs, RecordType: (key, value) => `MyRecord`, }), primitiveTypeConstructs: (constructs) => ({ ...constructs, string: { "date-time": "Date", }, }), hooks: { onCreateComponent: (component) => {}, onCreateRequestParams: (rawType) => {}, onCreateRoute: (routeData) => {}, onCreateRouteName: (routeNameInfo, rawRouteInfo) => {}, onFormatRouteName: (routeInfo, templateRouteName) => {}, onFormatTypeName: (typeName, rawTypeName, schemaType) => {}, onInit: (configuration) => {}, onPreParseSchema: (originalSchema, typeName, schemaType) => {}, onParseSchema: (originalSchema, parsedSchema) => {}, onPrepareConfig: (currentConfiguration) => {}, }, }) .then(({ files, configuration }) => { files.forEach(({ content, name }) => { fs.writeFile(path, content); }); }) .catch((e) => console.error(e)); generateTemplates({ cleanOutput: false, output: PATH_TO_OUTPUT_DIR, httpClientType: "fetch", modular: false, silent: false, rewrite: false, }); ``` ## Options ### **`--templates`** This option needed for cases when you don't want to use the default `swagger-typescript-api` output structure You can create custom templates with extensions `.ejs` or `.eta` Templates: - `api.ejs` - _(generates file)_ Api class module (locations: [/templates/default](https://github.com/acacode/swagger-typescript-api/tree/main/templates/default/api.ejs), [/templates/modular](https://github.com/acacode/swagger-typescript-api/tree/main/templates/modular/api.ejs)) - `data-contracts.ejs` - _(generates file)_ all types (data contracts) from swagger schema (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/data-contracts.ejs)) - `http-client.ejs` - _(generates file)_ HttpClient class module (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/http-client.ejs)) - `procedure-call.ejs` - _(subtemplate)_ route in Api class (locations: [/templates/default](https://github.com/acacode/swagger-typescript-api/tree/main/templates/default/procedure-call.ejs), [/templates/modular](https://github.com/acacode/swagger-typescript-api/tree/main/templates/modular/procedure-call.ejs)) - `route-docs.ejs` - _(generates file)_ documentation for route in Api class (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/route-docs.ejs)) - `route-name.ejs` - _(subtemplate)_ route name for route in Api class (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/route-name.ejs)) - `route-type.ejs` - _(`--route-types` option)_ _(subtemplate)_ (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/route-type.ejs)) - `route-types.ejs` - _(`--route-types` option)_ _(subtemplate)_ (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/route-types.ejs)) - `data-contract-jsdoc.ejs` - _(subtemplate)_ generates JSDOC for data contract (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/data-contract-jsdoc.ejs)) [//]: # "- `enum-data-contract.ejs` - *(subtemplate)* generates `enum` data contract (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/enum-data-contract.ejs))" [//]: # "- `interface-data-contract.ejs` - *(subtemplate)* generates `interface` data contract (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/interface-data-contract.ejs))" [//]: # "- `type-data-contract.ejs` - *(subtemplate)* generates `type` data contract (locations: [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base/type-data-contract.ejs))" How to use it: 1. copy `swagger-typescript-api` templates into your place in project - from [/templates/default](https://github.com/acacode/swagger-typescript-api/tree/main/templates/default) for single api file - from [/templates/modular](https://github.com/acacode/swagger-typescript-api/tree/main/templates/modular) for multiple api files (with `--modular` option) - from [/templates/base](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base) for base templates (templates using both in default and modular) 1. add `--templates PATH_TO_YOUR_TEMPLATES` option 1. modify [ETA](https://eta.js.org/docs/syntax) templates as you like NOTE: Eta has special directive to render template in your Eta templates - `includeFile(pathToTemplate, payload)` If you want to use some default templates from this tool you can use path prefixes: `@base`, `@default`, `@modular`. `@base` - [path to base templates](https://github.com/acacode/swagger-typescript-api/tree/main/templates/base) `@default` - [path to single api file templates](https://github.com/acacode/swagger-typescript-api/tree/main/templates/default) `@modular` - [path to multiple api files templates](https://github.com/acacode/swagger-typescript-api/tree/main/templates/modular) Examples: - `includeFile("@base/data-contracts.ejs", { ...yourData, ...it })` - `includeFile("@default/api.ejs", { ...yourData, ...it })` - `includeFile("@default/procedure-call.ejs", { ...yourData, ...it })` - `includeFile("@modular/api.ejs", { ...yourData, ...it })` - `includeFile("@modular/procedure-call.ejs", { ...yourData, ...it })` - `includeFile("@base/route-docs.ejs", { ...yourData, ...it })` - `includeFile("@base/route-name.ejs", { ...yourData, ...it })` - `includeFile("@base/route-type.ejs", { ...yourData, ...it })` - `includeFile("@base/route-types.ejs", { ...yourData, ...it })` ### **`--module-name-index`** This option should be used in cases when you have api with one global prefix like `/api` Example: `GET:/api/fruits/getFruits` `POST:/api/fruits/addFruits` `GET:/api/vegetables/addVegetable` with `--module-name-index 0` Api class will have one property `api` When we change it to `--module-name-index 1` then Api class have two properties `fruits` and `vegetables` ### **`--module-name-first-tag`** This option will group your API operations based on their first tag - mirroring how the Swagger UI groups displayed operations ### `extraTemplates` (NodeJS option) type `(Record & { name: string, path: string })[]` This thing allow you to generate extra ts\js files based on extra templates (one extra template for one ts\js file) [Example here](https://github.com/acacode/swagger-typescript-api/tree/main/tests/spec/extra-templates) ## `generate-templates` command This command allows you to generate source templates which using with option `--templates` ## Modification internal codegen structs with NodeJS API: You are able to modify TypeScript internal structs using for generating output with using `generateApi` options `codeGenConstructs` and `primitiveTypeConstructs`. ### `codeGenConstructs` This option has type `(struct: CodeGenConstruct) => Partial`. ```ts generateApi({ // ... codeGenConstructs: (struct) => ({ Keyword: { Number: "number", String: "string", Boolean: "boolean", Any: "any", Void: "void", Unknown: "unknown", Null: "null", Undefined: "undefined", Object: "object", File: "File", Date: "Date", Type: "type", Enum: "enum", Interface: "interface", Array: "Array", Record: "Record", Intersection: "&", Union: "|", }, CodeGenKeyword: { UtilRequiredKeys: "UtilRequiredKeys", }, /** * $A[] or Array<$A> */ ArrayType: (content) => { if (this.anotherArrayType) { return `Array<${content}>`; } return `(${content})[]`; }, /** * "$A" */ StringValue: (content) => `"${content}"`, /** * $A */ BooleanValue: (content) => `${content}`, /** * $A */ NumberValue: (content) => `${content}`, /** * $A */ NullValue: (content) => content, /** * $A1 | $A2 */ UnionType: (contents) => _.join(_.uniq(contents), ` | `), /** * ($A1) */ ExpressionGroup: (content) => (content ? `(${content})` : ""), /** * $A1 & $A2 */ IntersectionType: (contents) => _.join(_.uniq(contents), ` & `), /** * Record<$A1, $A2> */ RecordType: (key, value) => `Record<${key}, ${value}>`, /** * readonly $key?:$value */ TypeField: ({ readonly, key, optional, value }) => _.compact([ readonly && "readonly ", key, optional && "?", ": ", value, ]).join(""), /** * [key: $A1]: $A2 */ InterfaceDynamicField: (key, value) => `[key: ${key}]: ${value}`, /** * $A1 = $A2 */ EnumField: (key, value) => `${key} = ${value}`, /** * $A0.key = $A0.value, * $A1.key = $A1.value, * $AN.key = $AN.value, */ EnumFieldsWrapper: (contents) => _.map(contents, ({ key, value }) => ` ${key} = ${value}`).join(",\n"), /** * {\n $A \n} */ ObjectWrapper: (content) => `{\n${content}\n}`, /** * /** $A *\/ */ MultilineComment: (contents, formatFn) => [ ...(contents.length === 1 ? [`/** ${contents[0]} */`] : ["/**", ...contents.map((content) => ` * ${content}`), " */"]), ].map((part) => `${formatFn ? formatFn(part) : part}\n`), /** * $A1<...$A2.join(,)> */ TypeWithGeneric: (typeName, genericArgs) => { return `${typeName}${ genericArgs.length ? `<${genericArgs.join(",")}>` : "" }`; }, }), }); ``` For example, if you need to generate output `Record` instead of `object` you can do it with using following code: ```ts generateApi({ // ... codeGenConstructs: (struct) => ({ Keyword: { Object: "Record", }, }), }); ``` ### `primitiveTypeConstructs` It is type mapper or translator swagger schema objects. `primitiveTypeConstructs` translates `type`/`format` schema fields to typescript structs. This option has type ```ts type PrimitiveTypeStructValue = | string | (( schema: Record, parser: import("./src/schema-parser/schema-parser").SchemaParser, ) => string); type PrimitiveTypeStruct = Record< "integer" | "number" | "boolean" | "object" | "file" | "string" | "array", | string | ({ $default: PrimitiveTypeStructValue } & Record< string, PrimitiveTypeStructValue >) >; declare const primitiveTypeConstructs: ( struct: PrimitiveTypeStruct, ) => Partial; generateApi({ // ... primitiveTypeConstructs: (struct) => ({ integer: () => "number", number: () => "number", boolean: () => "boolean", object: () => "object", file: () => "File", string: { $default: () => "string", /** formats */ binary: () => "File", file: () => "File", "date-time": () => "string", time: () => "string", date: () => "string", duration: () => "string", email: () => "string", "idn-email": () => "string", "idn-hostname": () => "string", ipv4: () => "string", ipv6: () => "string", uuid: () => "string", uri: () => "string", "uri-reference": () => "string", "uri-template": () => "string", "json-pointer": () => "string", "relative-json-pointer": () => "string", regex: () => "string", }, array: (schema, parser) => { const content = parser.getInlineParseContent(schema.items); return parser.safeAddNullToType(schema, `(${content})[]`); }, }), }); ``` For example, if you need to change `"string"/"date-time"` default output as `string` to `Date` you can do it with using following code: ```ts generateApi({ primitiveTypeConstructs: (struct) => ({ string: { "date-time": "Date", }, }), }); ``` See more about [swagger schema type/format data here](https://json-schema.org/understanding-json-schema/reference/string.html#dates-and-times) ## Mass media - [5 Lessons learned about swagger-typescript-api](https://christo8989.medium.com/5-lessons-learned-about-swagger-typescript-api-511240b34c1) - [Why Swagger schemes are needed in frontend development ?](https://dev.to/js2me/why-swagger-schemes-are-needed-in-frontend-development-2cb4) - [Migration en douceur vers TypeScript (French)](https://www.premieroctet.com/blog/migration-typescript/) - [swagger-typescript-api usage (Japanese)](https://zenn.dev/watahaya/articles/2f4a716c47903b) ## License Licensed under the [MIT License](https://github.com/acacode/swagger-typescript-api/blob/main/LICENSE).

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