Re: Generate request payload from JSON schema or OpenAPI spec

Another way of doing this is via Swagger-codegen, which has a JMeter output template - an example of generating a JMeter file from a Swagger definition is available here: https://wilsonmar.github.io/swagger-codegen/ Effectively the JMeter script is generated from a mustache template, so it will

Re: Generate request payload from JSON schema or OpenAPI spec

The only way of automatically creating a JMeter test from API definition is using SoapUI as interim step. So given you have SoapUI you should be able to import Swagger / OpenAPI definition into SoapUI project:

Re: Generate request payload from JSON schema or OpenAPI spec

The only way of automatically creating a JMeter test from API definition is using SoapUI as interim step. So given you have SoapUI you should be able to import Swagger / OpenAPI definition into SoapUI project: