Mock API Generator | Generate Functional Mock APIs Instantly

Define Your API Schema

Paste your OpenAPI (Swagger) YAML/JSON or standard JSON Schema below. We will automatically generate endpoints and mock data.

{
  "openapi": "3.0.0",
  "info": {
    "title": "Sample API",
    "version": "1.0.0"
  },
  "paths": {
    "/users": {
      "get": {
        "summary": "List users",
        "responses": {
          "200": {
            "description": "Successful response",
            "content": {
              "application/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "id": { "type": "integer", "minimum": 1 },
                      "name": { "type": "string", "faker": "name.findName" },
                      "email": { "type": "string", "format": "email" },
                      "role": { "type": "string", "enum": ["admin", "user"] }
                    },
                    "required": ["id", "name", "email"]
                  }
                }
              }
            }
          }
        }
      },
      "post": {
        "summary": "Create user",
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "properties": {
                  "name": { "type": "string" },
                  "email": { "type": "string" }
                }
              }
            }
          }
        },
        "responses": {
          "201": {
            "description": "User created",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "id": { "type": "integer" },
                    "message": { "type": "string", "example": "User created successfully" }
                  }
                }
              }
            }
          }
        }
      }
    },
    "/users/{id}": {
      "get": {
        "summary": "Get user by ID",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "required": true,
            "schema": { "type": "integer" }
          }
        ],
        "responses": {
          "200": {
            "description": "User found",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "id": { "type": "integer" },
                    "name": { "type": "string" }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

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Why Use Mock APIs?

Frontend First Development: Start building UI before the backend is ready.
Isolate Testing: Test edge cases and error states (500, 404) easily without manipulating real databases.
Prototype Rapidly: valid ideas quickly with realistic data instead of "Lorem Ipsum".

Supported Formats

OpenAPI (Swagger)

v2.0, v3.0, v3.1

JSON Schema

Draft 4, 7, 2019-09