cURL & HAR to JMeter JMX Converter

Presets:HTTP QUERY (RFC 9838)POST Login + Bearer AuthMulti-Step Flow (CRUD)

Input: cURL Command(s) or HAR 1.2 JSONcurl -X QUERY "https://api.example.com/v1/catalog/search" \ -H "Content-Type: application/json" \ -H "Authorization: Bearer sample-jwt-token-xyz" \ -d '{ "filter": { "status": "in_stock", "price": { "lte": 150 } }, "sort": "price:asc", "limit": 20 }'Supports all HTTP methods (GET, POST, PUT, DELETE, PATCH, QUERY), headers, cookies, JSON bodies, and multi-step batch scripts.Virtual Users (Threads)

users

Target concurrency for Thread GroupRamp-Up Time

sec

Time to spawn all threadsDuration

sec

0 = run loop count only; > 0 enables schedulerLoop Count

loops

Set -1 for infinite executionTest Plan NameRoot Test Plan label in JMeter tree

Extract Host to ${BASE_URL} & HTTP DefaultsParameterize Bearer Tokens (${AUTH_TOKEN})Add HTTP 200/201/204 Response Code AssertionsInclude HTTP Cookie ManagerFilter Static Media / Fonts in HAR

HTTP Samplers-

Format Detected-

Target Hosts-

⚠️ Notice / Warnings:

Parsed Endpoints

Generated Apache JMeter JMX XML

JMeter 5.6.3 Valid

Download test-plan.jmxCopy JMX XMLReset

🤖 Add this conversion tool to your AI Agent (MCP)

Claude Code, Cursor, Windsurf, and other agents can call convert_curl_or_har_to_jmx directly over Model Context Protocol:

claude mcp add jmeter-docs https://docs.jmeter.ai/api/mcp --transport http

Client-side Browser Security: All on-page conversions run 100% locally in your browser. When using the hosted MCP endpoint (/api/mcp), ensure sensitive production passwords and API keys are redacted. See HTTP Request Sampler Manual and JMeter MCP Reference.

How the Converter Works

Creating JMeter test plans manually for dozens of API endpoints is slow and error-prone. This converter takes raw cURL commands (from Swagger, Postman, browser DevTools, or terminal history) and HAR 1.2 network captures, automatically structuring them into a production-grade Apache JMeter 5.6.3 .jmx test plan.

What Gets Automatically Generated?

1. HTTP Request Defaults (ConfigTestElement): Detects the dominant target domain across your requests and parameterizes it into ${BASE_URL}, making environment switching (Dev $\to$ Staging $\to$ Prod) effortless.
2. HTTP Header Manager (HeaderManager): Preserves required custom headers (Content-Type, Accept, X-Api-Key), while stripping transport-level noise (Content-Length) that JMeter calculates dynamically.
3. HTTP Cookie Manager (CookieManager): Auto-injected to manage session cookies and cross-request state across iterations.
4. Auth Parameterization: Automatically detects Authorization: Bearer <token> and parameterizes it as ${AUTH_TOKEN} in User Defined Variables.
5. Robust Timeouts: Connect timeout is preset to 5000ms and response timeout to 15000ms on every sampler to prevent thread pool lockup during load spikes.
6. Response Code Assertions: Generates baseline ResponseAssertion elements validating HTTP 200, 201, and 204 status codes.

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Full HTTP Method Support (Including QUERY RFC 9838)

The converter supports all standard and modern HTTP methods:

Method	JMeter Implementation	Use Case
GET	HTTPSamplerProxy (Query Params in Arguments or Path)	Fetching resources and reading data
POST	HTTPSamplerProxy (postBodyRaw="true" or Form fields)	Creating resources / authentication
QUERY	HTTPSamplerProxy (postBodyRaw="true", Method=QUERY)	Safe, idempotent complex queries with JSON payload bodies (Elasticsearch, GraphQL, modern REST)
PUT	HTTPSamplerProxy (postBodyRaw="true")	Full resource replacement
PATCH	HTTPSamplerProxy (postBodyRaw="true")	Partial resource modification
DELETE	HTTPSamplerProxy	Removing resources
HEAD / OPTIONS	HTTPSamplerProxy	Health checks and CORS preflight

Example: HTTP QUERY Method in cURL

curl -X QUERY "https://api.example.com/v1/catalog/search" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sample-jwt-token-xyz" \
  -d '{
    "filter": { "status": "in_stock", "price": { "lte": 150 } },
    "sort": "price:asc"
  }'

The converter translates this into a valid JMeter HTTP Sampler with the QUERY method and raw payload body configured without requiring custom plugins.

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Running the Generated JMX in CLI Mode

Once you download the .jmx file, run it in non-GUI mode from your terminal:

jmeter -n -t test-plan.jmx -l results.jtl -e -o ./report

You can override virtual users dynamically at runtime:

jmeter -n -t test-plan.jmx -Jthreads=100 -l results.jtl -e -o ./report

To run for a fixed duration, set Duration to a value greater than zero before downloading the plan. This enables JMeter’s scheduler and generates the required infinite-loop behavior; adding -Jduration to a plan converted with Duration 0 does not enable the scheduler.

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Use via AI Agent (MCP Tool)

You can call this converter directly inside Claude Code, Cursor, Windsurf, Qwen Code, and Copilot via our free Model Context Protocol server:

claude mcp add jmeter-docs https://docs.jmeter.ai/api/mcp --transport http --scope user

Prompt your AI agent:

“Convert this cURL command into a JMeter test plan with 50 threads and 10s rampup: curl -X QUERY https://api.example.com/v1/search -H 'Content-Type: application/json' -d '{\"query\":\"loadtest\"}'”

Your agent calls convert_curl_or_har_to_jmx and outputs schema-valid XML ready for execution.