OpenAPI to Postman Converter — Convert Swagger Specs to Test Collections
Convert OpenAPI 3.x JSON or YAML specs into a ready-to-import Postman Collection v2.1. Paths, methods, parameters, request bodies, and tags are all mapped automatically.
How to Use OpenAPI to Postman Converter — Convert Swagger Specs to Test Collections
How to Use the OpenAPI to Postman Converter
Step 1: Paste or Upload Your OpenAPI Spec
Choose one of two input methods:
- Paste JSON / YAML — copy your OpenAPI 3.x spec and paste it directly (supports both JSON and YAML)
- Upload File — drag and drop or click to upload a
.json,.yaml, or.ymlfile (max 10 MB)
You can also click the Petstore (JSON) or Users API (YAML) example buttons to load a sample spec instantly.
Step 2: Convert
Click Convert to Postman. The tool will:
- Map every
pathsentry and HTTP method to a Postman request item - Extract path variables (
{userId}→:userId) with example values - Map query parameters with inferred example values
- Map header parameters
- Generate JSON request body examples from
requestBodyschemas - Support
multipart/form-dataandapplication/x-www-form-urlencodedbody modes - Organize requests into folders by their OpenAPI
tags - Add a
{{baseUrl}}collection variable pre-filled with the server URL
Step 3: Download and Import
Click Download .json to save the Postman Collection file. Then in Postman:
- Click Import in the top-left corner
- Drag in the downloaded
.jsonfile (or click to select it) - Click Import — your collection is ready
All requests will use the {{baseUrl}} collection variable. Update it under Variables in the collection editor if your environment URL differs.
What Is Converted
| OpenAPI Field | Postman Field |
|---|---|
info.title | Collection name |
servers[0].url | {{baseUrl}} variable |
paths + HTTP method | Request item |
operationId / summary | Request name |
tags | Folder name |
Path variables {id} | URL variable :id |
| Query parameters | URL query params |
| Header parameters | Request headers |
requestBody (JSON) | Raw JSON body |
requestBody (form-data) | Form-data body |
requestBody (urlencoded) | URL-encoded body |
Frequently Asked Questions
Most Viewed Tools
Screen Size Converter — Diagonal Dimension Tool
Calculate screen width and height from diagonal size and aspect ratio. Convert between inches and centimeters for displays, TVs, and monitors with instant dimension calculations.
Use Tool →DPI Calculator — Print Resolution Tool
Calculate DPI (dots per inch), image dimensions, and print sizes. Convert between pixels and physical dimensions for printing and displays.
Use Tool →TOTP Code Generator — 2FA Testing Tool
Generate time-based one-time passwords from a TOTP secret key. Enter your base32 secret, choose a period and digit length, and get the current and next codes with a live countdown timer. Useful for testing and debugging 2FA integrations.
Use Tool →JSONL Formatter — Line-by-Line Validator
Format, validate, and inspect JSON Lines (JSONL) and NDJSON files. Validates each line individually, reports parse errors by line number, outputs compact JSONL or a pretty-print preview, and lets you download the cleaned file.
Use Tool →Password Entropy Calculator — Crack Time Estimator
Calculate the information-theoretic bit entropy of any password or API key. Detects character set pools automatically, shows the total number of possible combinations, and estimates crack time across five attack scenarios from rate-limited web logins to GPU cracking clusters.
Use Tool →JSON to Zod — Schema Generator
Generate Zod validation schema code from a JSON sample object. Infers z.string(), z.number(), z.boolean(), z.array(), z.object(), and z.null() types automatically. Handles nested objects, arrays of objects with optional field detection, and outputs copy-ready TypeScript with import and z.infer type alias.
Use Tool →TLS Cipher Suite Checker — Strength Analyzer
Check TLS protocol version compatibility and cipher suite strength ratings against current best practices. Supports IANA and OpenSSL cipher names — rates each suite as Strong, Weak, or Deprecated and explains why.
Use Tool →Seconds to Time Converter — HH:MM:SS Formatter
Convert seconds to HH:MM:SS time format instantly with precise calculations and easy-to-read formatting.
Use Tool →Related API & Backend Tools
GraphQL Cost Estimator — Analyze Query Complexity and Depth
Assign custom field weights to a GraphQL schema and calculate the total query complexity score. Paste any GraphQL query, configure per-field costs, and get a per-field breakdown table showing depth, multipliers, and cumulative cost.
Use Tool →OAuth PKCE Generator — Create Secure Code Verifiers and Challenges
Generate RFC 7636 PKCE code verifier and challenge pairs for OAuth 2.0 authorization code flow. Choose verifier length, get the SHA-256 code challenge, and see exactly where each value goes in the auth URL and token exchange request.
Use Tool →API Mock Server Config Generator — Build Instant Mock Endpoints Online
Paste API route definitions to instantly generate JSON configuration files for json-server, Mockoon, and Prism mock servers. Define routes as METHOD /path lines and get ready-to-use config with realistic sample data.
Use Tool →Postman to OpenAPI Converter — Spec Migration Tool
Convert Postman Collection v2.1 JSON to OpenAPI 3.0 specification format. Upload or paste your collection, and get a downloadable openapi.yaml or openapi.json with mapped paths, parameters, request bodies, and example responses.
Use Tool →GraphQL Subscription Builder — Generate WebSocket Payloads and Client Queries
Build GraphQL subscription query strings and generate WebSocket connection code snippets for Apollo Client, urql, and graphql-ws. Define your operation name, variables, and selection fields visually, then copy the ready-to-use code.
Use Tool →API Mock Data Generator — Realistic JSON Builder
Generate structured, realistic mock data for API endpoint testing. Define fields with names and types — UUID, name, email, integer, enum, date, and more — set how many rows you need, and export as a JSON array, NDJSON, or CSV. All generation runs entirely in your browser with no data sent to any server.
Use Tool →API Error Decoder — Fix Suggestion Tool
Decode HTTP status codes and OAuth 2.0 error strings with plain-English descriptions, common causes, and actionable fix suggestions. Covers every HTTP 1xx–5xx status code and all standard OAuth 2.0 error responses. Results appear instantly as you type.
Use Tool →API Changelog Generator — Automatically Detect Breaking Changes and Write Release Notes
Convert API change descriptions into structured Keep-a-Changelog format. Enter a version, date, and one change per line prefixed with its type (added, changed, deprecated, removed, fixed, or security). The tool instantly groups them into the canonical section order and outputs a ready-to-paste CHANGELOG.md block. Supports four real-world presets for REST API releases, breaking changes, patch releases, and unreleased work. Free and runs entirely in your browser.
Use Tool →Share Your Feedback
Help us improve this tool by sharing your experience