> ## Documentation Index > Fetch the complete documentation index at: https://docs.iotools.cloud/llms.txt > Use this file to discover all available pages before exploring further. # OpenAPI v2 to v3 Converter > Convert a Swagger 2.0 (OpenAPI v2) spec into OpenAPI 3.x — host/basePath/schemes become servers, definitions become components.schemas with every $ref rewritten, body/formData parameters become requestBody, and produces/consumes become per-response/per-request content maps. Accepts and emits YAML or JSON, and runs entirely in your browser. [Try OpenAPI v2 to v3 Converter in your browser →](https://iotools.cloud/tool/openapi-v2-to-v3-converter/) ## OpenAPI ````yaml https://api.iotools.cloud/v1/openapi post /v1/tool/openapi-v2-to-v3-converter openapi: 3.1.0 info: title: iotools.cloud API version: 1.0.0 description: >- Run any iotools.cloud tool over HTTP. Authenticate with `Authorization: Bearer iot_live_…`. **Only `POST /v1/tool/{slug}` costs credits.** Every GET here — the catalog, a tool's schema, your balance — is free. A tool call is charged its own weight or your plan's per-call minimum, whichever is larger; `x-iotools-credit-cost` on each operation is quoted at the free-tier minimum, and `GET /v1/tools/list` returns the exact figure for your key. `GET /v1/me/credits` reports what you have left, and `GET /v1/me/usage` reports what it went on. Failures are RFC 9457 problem documents — branch on `code`. servers: - url: https://api.iotools.cloud description: Production security: - bearerAuth: [] tags: - name: Catalog description: Find a tool and read its contract. Free. - name: Converters description: >- Convert between formats, encodings, and units — Base64, CSV and JSON, timestamps, and more. Fast, free, and processed right in your browser. - name: Formatters description: >- Format, beautify, minify, and validate code and data — JSON, HTML, CSS, SQL, and regex. Clean up messy input in one click, with nothing to upload. - name: Generators description: >- Generate exactly what you need and on demand — passwords, UUIDs, QR codes, hashes, random numbers, and more. Secure, instant, and free. - name: Calculators description: >- Crunch the numbers fast — from everyday math to specialized conversions and unit work. Free online calculators that run entirely in your browser. - name: Editors description: >- Edit and transform text, code, and images with quick, focused editors that run entirely in your browser — nothing to install, and no sign-up needed. - name: Utilities description: >- Everyday developer and web utilities — DNS and IP lookups, redirect and certificate checkers, and other quick diagnostics. Free and privacy-friendly. - name: Account description: Your key's allowance, limits and usage history. paths: /v1/tool/openapi-v2-to-v3-converter: post: tags: - Converters summary: OpenAPI v2 to v3 Converter description: >- Convert a Swagger 2.0 (OpenAPI v2) spec into OpenAPI 3.x — host/basePath/schemes become servers, definitions become components.schemas with every $ref rewritten, body/formData parameters become requestBody, and produces/consumes become per-response/per-request content maps. Accepts and emits YAML or JSON, and runs entirely in your browser. [Try OpenAPI v2 to v3 Converter in your browser →](https://iotools.cloud/tool/openapi-v2-to-v3-converter/) operationId: run_openapi_v2_to_v3_converter requestBody: required: false content: application/json: schema: type: object properties: swaggerInput: type: string description: Swagger 2.0 Spec outputFormat: enum: - same - yaml - json description: Output Format patchSpec: type: boolean description: >- Patch missing required fields (e.g. title, version, response descriptions) required: [] examples: pet_store_yaml_definitions_body_param_formdata_security: summary: >- Pet Store (YAML, definitions + body param + formData + security) value: swaggerInput: |- swagger: "2.0" info: title: Pet Store API description: A sample Swagger 2.0 spec version: "1.0.0" host: api.petstore.example.com basePath: /v1 schemes: - https consumes: - application/json produces: - application/json paths: /pets: get: operationId: listPets summary: List all pets parameters: - name: limit in: query required: false type: integer format: int32 responses: "200": description: A list of pets schema: type: array items: $ref: "#/definitions/Pet" post: operationId: createPet summary: Create a pet consumes: - application/json parameters: - name: body in: body required: true schema: $ref: "#/definitions/NewPet" responses: "201": description: Pet created schema: $ref: "#/definitions/Pet" /pets/{petId}/photo: post: operationId: uploadPetPhoto summary: Upload a photo for a pet consumes: - multipart/form-data parameters: - name: petId in: path required: true type: string - name: photo in: formData required: true type: file - name: caption in: formData required: false type: string responses: "200": description: Upload successful securityDefinitions: apiKeyAuth: type: apiKey in: header name: X-API-Key basicAuth: type: basic definitions: Pet: type: object required: - id - name properties: id: type: integer format: int64 name: type: string tag: type: string x-nullable: true NewPet: type: object required: - name properties: name: type: string tag: type: string outputFormat: same patchSpec: 'true' widget_api_json_in_yaml_out_oauth2_security_patch_fills_missing_title: summary: >- Widget API (JSON in, YAML out, oauth2 security, patch fills missing title) value: swaggerInput: |- { "swagger": "2.0", "info": { "version": "2.1.0" }, "host": "widgets.example.com", "schemes": [ "https", "http" ], "produces": [ "application/json" ], "paths": { "/widgets": { "get": { "operationId": "listWidgets", "responses": { "200": { "description": "A list of widgets", "schema": { "type": "array", "items": { "$ref": "#/definitions/Widget" } } } } } } }, "securityDefinitions": { "oauth2Client": { "type": "oauth2", "flow": "application", "tokenUrl": "https://widgets.example.com/oauth/token", "scopes": { "widgets:read": "Read widgets" } } }, "definitions": { "Widget": { "type": "object", "properties": { "id": { "type": "integer" }, "name": { "type": "string" } } } } } outputFormat: yaml patchSpec: 'true' responses: '200': description: Tool output content: application/json: examples: pet_store_yaml_definitions_body_param_formdata_security: summary: >- Pet Store (YAML, definitions + body param + formData + security) value: tool: openapi-v2-to-v3-converter tool_version: 1.0.1 outputs: summary: - metric: Input value: Swagger 2.0 - metric: Output value: OpenAPI 3.0.3 - metric: Endpoints value: '3' - metric: Schemas value: '2' - metric: Errors value: '0' - metric: Warnings value: '0' - metric: Notes value: '0' issues: [] convertedOutput: | openapi: 3.0.3 info: title: Pet Store API description: A sample Swagger 2.0 spec version: 1.0.0 servers: - url: https://api.petstore.example.com/v1 paths: /pets: get: summary: List all pets operationId: listPets parameters: - name: limit in: query required: false schema: type: integer format: int32 responses: "200": description: A list of pets content: application/json: schema: type: array items: $ref: "#/components/schemas/Pet" post: summary: Create a pet operationId: createPet requestBody: required: true content: application/json: schema: $ref: "#/components/schemas/NewPet" responses: "201": description: Pet created content: application/json: schema: $ref: "#/components/schemas/Pet" /pets/{petId}/photo: post: summary: Upload a photo for a pet operationId: uploadPetPhoto parameters: - name: petId in: path required: true schema: type: string requestBody: content: multipart/form-data: schema: type: object properties: photo: type: string format: binary caption: type: string required: - photo required: true responses: "200": description: Upload successful components: schemas: Pet: type: object required: - id - name properties: id: type: integer format: int64 name: type: string tag: type: string nullable: true NewPet: type: object required: - name properties: name: type: string tag: type: string securitySchemes: apiKeyAuth: type: apiKey name: X-API-Key in: header basicAuth: type: http scheme: basic credits_used: 3 credits_remaining: null widget_api_json_in_yaml_out_oauth2_security_patch_fills_missing_title: summary: >- Widget API (JSON in, YAML out, oauth2 security, patch fills missing title) value: tool: openapi-v2-to-v3-converter tool_version: 1.0.1 outputs: summary: - metric: Input value: Swagger 2.0 - metric: Output value: OpenAPI 3.0.3 - metric: Endpoints value: '1' - metric: Schemas value: '1' - metric: Errors value: '0' - metric: Warnings value: '0' - metric: Notes value: '1' issues: - severity: Info path: /info/title message: Added placeholder title (was missing) convertedOutput: | openapi: 3.0.3 info: version: 2.1.0 title: Untitled API servers: - url: https://widgets.example.com - url: http://widgets.example.com paths: /widgets: get: operationId: listWidgets responses: "200": description: A list of widgets content: application/json: schema: type: array items: $ref: "#/components/schemas/Widget" components: schemas: Widget: type: object properties: id: type: integer name: type: string securitySchemes: oauth2Client: type: oauth2 flows: clientCredentials: scopes: widgets:read: Read widgets tokenUrl: https://widgets.example.com/oauth/token credits_used: 3 credits_remaining: null schema: type: object required: - tool - tool_version - outputs - credits_used - credits_remaining properties: outputs: type: object properties: summary: type: array items: type: object properties: metric: type: string description: Metric value: type: string description: Value x-iotools-columns: - metric - value issues: type: array items: type: object properties: severity: type: string description: Severity path: type: string description: Path message: type: string description: Message x-iotools-columns: - severity - path - message convertedOutput: type: string description: OpenAPI 3.0.3 Spec tool: type: string description: The tool's slug, echoing the {slug} in the request path. tool_version: type: string description: Output-contract version for this tool. credits_used: type: integer description: >- Credits this call consumed, after any settlement refund. 0 when metering is disabled. credits_remaining: type: - integer - 'null' description: >- Credits left in the current monthly allowance, or null when metering is disabled. request_id: type: string description: Correlation id, also sent as x-request-id. '400': $ref: '#/components/responses/ValidationError' '401': $ref: '#/components/responses/Unauthorized' '402': $ref: '#/components/responses/InsufficientCredits' '403': $ref: '#/components/responses/ToolNotAllowed' '404': $ref: '#/components/responses/ToolNotFound' '413': $ref: '#/components/responses/PayloadTooLarge' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/ToolFailed' '503': $ref: '#/components/responses/ToolDisabled' security: - bearerAuth: [] components: responses: ValidationError: description: Invalid request. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/validation_error title: type: string description: Short human-readable summary of the failure. examples: - Invalid request status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - validation_error detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. fields: type: - object - string additionalProperties: type: string description: >- What failed: a map of field name → message. Absent when the body itself is malformed; a single string when the failure isn't tied to one field. example: type: https://iotools.cloud/docs/errors/validation_error title: Invalid request status: 400 code: validation_error detail: One or more inputs are invalid — see `fields`. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 fields: inputString: Required Unauthorized: description: Missing or invalid API key. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/invalid_api_key title: type: string description: Short human-readable summary of the failure. examples: - Invalid API key status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - invalid_api_key detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. example: type: https://iotools.cloud/docs/errors/invalid_api_key title: Invalid API key status: 401 code: invalid_api_key detail: 'Provide ''Authorization: Bearer ''.' request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 InsufficientCredits: description: Monthly credit allowance exhausted. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/insufficient_credits title: type: string description: Short human-readable summary of the failure. examples: - Insufficient credits status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - insufficient_credits detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. credits_used: type: integer description: Always 0 — a refused call charges nothing. credits_remaining: type: integer description: Credits left in the allowance — fewer than this call costs. example: type: https://iotools.cloud/docs/errors/insufficient_credits title: Insufficient credits status: 402 code: insufficient_credits detail: This call costs 1 credit and 0 remain in this month's allowance. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 credits_used: 0 credits_remaining: 0 ToolNotAllowed: description: Tool exists but has no API surface. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/tool_not_allowed title: type: string description: Short human-readable summary of the failure. examples: - Tool not available over the API status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - tool_not_allowed detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. example: type: https://iotools.cloud/docs/errors/tool_not_allowed title: Tool not available over the API status: 403 code: tool_not_allowed detail: >- "Background Remover" is available on iotools.cloud but has no API endpoint. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 ToolNotFound: description: No such tool. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/tool_not_found title: type: string description: Short human-readable summary of the failure. examples: - Tool not found status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - tool_not_found detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. example: type: https://iotools.cloud/docs/errors/tool_not_found title: Tool not found status: 404 code: tool_not_found detail: No tool with that slug. See GET /v1/tools/list. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 PayloadTooLarge: description: Body too large. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/payload_too_large title: type: string description: Short human-readable summary of the failure. examples: - Payload too large status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - payload_too_large detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. example: type: https://iotools.cloud/docs/errors/payload_too_large title: Payload too large status: 413 code: payload_too_large detail: Request body exceeds this tool's size limit. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 RateLimited: description: Per-minute rate limit exceeded. headers: Retry-After: description: Seconds to wait before retrying (RFC 9110 delta-seconds). schema: type: integer content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/rate_limited title: type: string description: Short human-readable summary of the failure. examples: - Rate limit exceeded status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - rate_limited detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. retry_after: type: integer description: >- Seconds until the window resets — the same value as the `Retry-After` header. example: type: https://iotools.cloud/docs/errors/rate_limited title: Rate limit exceeded status: 429 code: rate_limited detail: Too many requests. Retry in 30s. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 retry_after: 30 ToolFailed: description: Tool failed to run. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/processing_error - https://iotools.cloud/docs/errors/internal_error title: type: string description: Short human-readable summary of the failure. examples: - Tool failed to run - Internal error status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - processing_error - internal_error detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. credits_used: type: integer description: >- Always 0 on `processing_error` — a failed run is refunded, floor included. credits_remaining: type: integer description: >- Credits left after the refund. Absent when metering is disabled. example: type: https://iotools.cloud/docs/errors/processing_error title: Tool failed to run status: 500 code: processing_error detail: The tool failed to run. Please try again. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 credits_used: 0 ToolDisabled: description: Tool temporarily disabled. content: application/problem+json: schema: type: object description: >- RFC 9457 problem document, served as application/problem+json. Branch on `code`; `title` is human prose and may be reworded without notice. Some failures add extension members — `fields` on validation errors, `retry_after` on 429s, `credits_used`/`credits_remaining` on billing-adjacent failures — documented on the responses that carry them. required: - type - title - status - code properties: type: type: string format: uri description: Stable documentation URI for this failure. examples: - https://iotools.cloud/docs/errors/tool_disabled - https://iotools.cloud/docs/errors/api_unconfigured title: type: string description: Short human-readable summary of the failure. examples: - Tool temporarily disabled - API not configured status: type: integer description: HTTP status code, matching the response's own status. code: type: string description: >- Stable machine-readable error code — branch on this, not `title`. enum: - tool_disabled - api_unconfigured detail: type: string description: Human explanation of this occurrence. request_id: type: string description: Correlation id, also sent as x-request-id. example: type: https://iotools.cloud/docs/errors/tool_disabled title: Tool temporarily disabled status: 503 code: tool_disabled detail: This tool is temporarily unavailable. Try again shortly. request_id: e4042b29-8f1e-4c7a-9b52-6f0d1a3c7e11 securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: iot_live_… ````