Openapi To Axios
TYPE-SAFE AXIOS API CLIENT GENERATOR

OpenAPI & Swagger to Axios TypeScript API Client Generator

Generate clean, type-safe Axios HTTP client functions and parameter interfaces from OpenAPI 3.0 and Swagger JSON/YAML specs.

100% Client-Side Privacy
Zero Server Transmission
Presets:
Client Architecture
Return:
Base URL
OpenAPI / Swagger Spec (JSON or YAML)
/**
 * Swagger Petstore (v1.0.0)
 * Sample store API with pets, inventories, and orders for testing Axios client generation.
 * Generated by ToolsAA OpenAPI to Axios Generator
 */

import axios, { AxiosInstance, AxiosRequestConfig, AxiosResponse } from 'axios';

DEFAULT_BASE_URL = 'https://petstore.swagger.io/v2';

apiClient: AxiosInstance = axios.create({
  baseURL: DEFAULT_BASE_URL,
  timeout: 15000,
  headers: {
    'Content-Type': 'application/json',
    Accept: 'application/json',
  },
});

// ============================================================================
// Data Models & Interfaces
// ============================================================================

Category {
  id?: number;
  name?: string;
}

Tag {
  id?: number;
  name?: string;
}

Pet {
  id: number;
  name: string;
  category?: Category;
  photoUrls?: string[];
  tags?: Tag[];
  status?: 'available' | 'pending' | 'sold';
}

NewPet {
  name: string;
  category?: Category;
  status?: 'available' | 'pending' | 'sold';
}

Order {
  id?: number;
  petId?: number;
  quantity?: number;
  shipDate?: string;
  status?: 'placed' | 'approved' | 'delivered';
  complete?: boolean;
}

// ============================================================================
// Parameter Types
// ============================================================================

ListPetsQueryParams {
  /** How many items to return at one time (max 100) */
  limit?: number;
  /** Status values that need to be considered for filter */
  status?: 'available' | 'pending' | 'sold';
}

// ============================================================================
// API Operations
// ============================================================================

/**
 * List all pets
 * Returns a paginated list of pets filtered by availability status.
 * @route GET /pets
 * @param params Query parameters
 */
listPets = async (
  params?: ListPetsQueryParams,
  config?: AxiosRequestConfig
): Promise<Pet[]> => {
  const response = await apiClient.get<Pet[]>('/pets', { params, ...config });
  return response.data;
};

/**
 * Create a pet
 * Add a new pet to the store inventory.
 * @route POST /pets
 * @param data Request payload
 */
createPet = async (
  data: NewPet,
  config?: AxiosRequestConfig
): Promise<Pet> => {
  const response = await apiClient.post<Pet>('/pets', data, { ...config });
  return response.data;
};

/**
 * Find pet by ID
 * Returns a single pet matching the ID.
 * @route GET /pets/{petId}
 * @param petId The id of the pet to retrieve
 */
getPetById = async (
  petId: number,
  config?: AxiosRequestConfig
): Promise<Pet> => {
  const response = await apiClient.get<Pet>(`/pets/${encodeURIComponent(String(petId))}`, { ...config });
  return response.data;
};

/**
 * Update pet by ID
 * Updates attributes of an existing pet record.
 * @route PUT /pets/{petId}
 * @param petId Path parameter
 * @param data Request payload
 */
updatePetById = async (
  petId: number,
  data: NewPet,
  config?: AxiosRequestConfig
): Promise<Pet> => {
  const response = await apiClient.put<Pet>(`/pets/${encodeURIComponent(String(petId))}`, data, { ...config });
  return response.data;
};

/**
 * Delete pet by ID
 * Deletes a pet record from database.
 * @route DELETE /pets/{petId}
 * @param petId Path parameter
 */
deletePetById = async (
  petId: number,
  config?: AxiosRequestConfig
): Promise<void> => {
  const response = await apiClient.delete<void>(`/pets/${encodeURIComponent(String(petId))}`, { ...config });
  return response.data;
};

/**
 * Place an order
 * Place an order for purchasing a pet.
 * @route POST /store/orders
 * @param data Request payload
 */
placeOrder = async (
  data: Order,
  config?: AxiosRequestConfig
): Promise<Order> => {
  const response = await apiClient.post<Order>('/store/orders', data, { ...config });
  return response.data;
};

/**
 * Find purchase order by ID
 * @route GET /store/orders/{orderId}
 * @param orderId Path parameter
 */
getOrderById = async (
  orderId: number,
  config?: AxiosRequestConfig
): Promise<Order> => {
  const response = await apiClient.get<Order>(`/store/orders/${encodeURIComponent(String(orderId))}`, { ...config });
  return response.data;
};
Endpoints Extracted
7
Schemas / Types
5
Generated Code Lines
171

Zero-Knowledge Local Execution

Instant OpenAPI 3.0/3.1 and Swagger 2.0 parsing and Axios TypeScript code generation executed entirely in browser memory.

Sub-Millisecond AST Engine

Proprietary API schemas, internal routes, and confidential contracts never leave your machine. 100% zero-server privacy.

Production-Ready TypeScript

Clean, strongly typed Axios functions, parameter interfaces, and interceptors ready for immediate copy-paste into frontend and Node services.

Technical Reference & Architecture Guide

OpenAPI & Swagger to Axios TypeScript API Client Generator — Reference Guide

Generate clean, type-safe Axios HTTP client functions and parameter interfaces from OpenAPI 3.0 and Swagger JSON/YAML specs.

Key Parameters & Controls

clientStyle'functional' | 'class'

Generates modular standalone fetcher functions or an encapsulated Axios API client class.

Default: 'functional'
axiosInstanceSourcestring

Import path or identifier for a custom pre-configured AxiosInstance (e.g. '@/lib/api-client').

Default: 'axios'
unwrapResponseboolean

Automatically unpacks response.data instead of returning the full AxiosResponse<T> wrapper.

Default: true
enumStyle'union' | 'enum'

Formats OpenAPI string enumerations as TypeScript literal union types or native TS enums.

Default: 'union'
includeErrorTypesboolean

Generates typed error response schemas for handling AxiosError<T> in try-catch blocks.

Default: true

Pro Tips & Best Practices

Configure JWT authentication

Configure JWT authentication and automatic token refresh via Axios request and response interceptors rather than manually attaching Authorization headers to each generated method.

Forward AbortSignal via

Forward AbortSignal via AxiosRequestConfig into generated client calls within React useEffect hooks to automatically cancel inflight requests upon unmount.

When API endpoints accept repeating

When API endpoints accept repeating array query parameters, configure Axios paramsSerializer with 'brackets' or 'repeat' formatting to match your backend OpenAPI expectations.

Use axios.isAxiosError<T>

Use axios.isAxiosError<T>(err) with generated error response interfaces to safely access structured backend validation errors without any unsafe casting.

Common Gotchas & Troubleshooting

Endpoints return AxiosResponse<unknown> or AxiosResponse<any>

Verify that the OpenAPI spec defines response schemas under 'responses.200.content.application/json.schema'. Without an explicit response schema, Axios defaults to unknown.

Missing operationId causes naming collisions in generated methods

Assign unique 'operationId' values in your OpenAPI specification, or let the generator construct fallback function names combining HTTP method and path segments (e.g. getUserById).

Multipart/form-data file uploads fail with invalid payload serialization

Ensure generated upload methods construct native FormData instances and omit the manual Content-Type header so Axios and the browser compute the multipart boundary automatically.

Frequently Asked Questions

Which OpenAPI and Swagger specification versions are supported?▼

The generator fully supports OpenAPI 3.1.x, OpenAPI 3.0.x, and Swagger (OpenAPI 2.0) in both formatted JSON and YAML syntax.

How does the generated Axios client handle query parameters?▼

Query parameters are compiled into typed TypeScript interfaces and passed directly to the Axios 'params' property, ensuring full compile-time type safety.

Can I use a custom Axios instance with preconfigured base URLs and timeouts?▼

Yes. Set 'axiosInstanceSource' to your custom instance import path (such as '@/lib/axios-client'), allowing all generated API calls to share interceptors, credentials, and base URLs.

Is my OpenAPI or Swagger specification uploaded to any server?▼

No. All YAML/JSON parsing, schema resolution, and TypeScript generation run 100% locally in your browser memory using client-side Web APIs.

How are 4xx and 5xx API error responses handled and typed?▼

The generator creates specific error interfaces for defined HTTP error status codes, which can be typed directly with axios.isAxiosError<ApiErrorResponse>(error).

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