AI ASSISTANT

AI that speaks your API's language.

Generate requests from plain English, explain response payloads, write pre-request scripts, and debug errors — all without leaving your workflow.

Rostyman AI assistant explaining an HTTP response inside the right panel

What you can do with the AI assistant

Generate requests from plain English

Describe what you want to test — "create a POST request to register a new user with email, name, and password fields" — and Rostyman builds the full request including URL, method, body schema, and headers.

Example: "Get all products in the Electronics category with price below $100, sorted by rating"

Explain response payloads

Paste any response JSON or select it in the response viewer. Ask "what does this response mean?" and get a plain-English explanation of every field, including inferred types and relationships.

Example: "What does the nested meta.pagination object mean in this response?"

Write pre-request scripts

Describe the script you need — "compute an HMAC-SHA256 signature for this request" or "refresh the OAuth token if it expires in less than 5 minutes" — and get working rm.* API JavaScript you can run directly.

Example: "Set a dynamic timestamp header for AWS request signing"

Debug API errors

Paste an error response, a 500 trace, or an unexpected result. The AI explains what went wrong, what the API server likely returned and why, and suggests how to fix the request.

Example: "Why am I getting 401 even though I set the Authorization header?"

Generate test assertions

After receiving a response, ask the AI to write post-response test scripts using the rm.test() API — asserting status, checking specific fields, validating schema structure.

Example: "Write tests to validate this user response has all required fields"

Convert cURL to request

Paste any cURL command and Rostyman's AI will parse it into a complete request — method, URL, headers, body, and auth — ready to send and save.

Example: "Convert this curl -X POST command to a request"

Choose your AI provider

Your API key, your data. We never proxy your requests through Rostyman servers.

OpenAI

GPT-4o, GPT-4o mini, GPT-4 Turbo

Connect with your own API key. Supports the latest models with function calling.

Requests go to OpenAI servers. Rostyman never stores your API key in plaintext.

Anthropic

Claude 3.5 Sonnet, Claude 3 Haiku

Use Anthropic's Claude models. Excellent at understanding complex API structures.

Requests go to Anthropic servers. Rostyman never stores your API key in plaintext.

Maximum Privacy

Ollama (Local)

Llama 3.2, Mistral, Qwen2.5, and any Ollama model

Run AI entirely on your machine. Zero network requests. Perfect for air-gapped environments or maximum privacy.

Completely private. Nothing leaves your machine. Requires Ollama installed locally.

Transparent AI pricing

Free

10 built-in requests/day

BYO Key

Unlimited

Add your own OpenAI or Anthropic API key in settings. You pay the provider directly at their rates — Rostyman takes nothing.

Ollama (Local)

Unlimited, free

Install Ollama, pull any model, point Rostyman at localhost:11434. Zero cost, zero network, fully private.

Privacy guarantee

Rostyman never sends your request data or collection contents to our servers — ever.

AI requests go directly from your machine to your chosen provider (OpenAI / Anthropic / Ollama).

With Ollama, everything runs locally — not even the AI provider sees your data.

Your API keys are stored encrypted in your local SQLite database.

We only collect anonymous install metrics (version, DAU) — never request or response content.

Start using AI-assisted API testing today

10 free requests per day included — no API key needed to start.

Download Free