API & Developer Testing Tools
Build, test, and debug HTTP/API requests - request builders, cURL tools, JSON/OpenAPI utilities, and reference lookups.
17 tools in this category
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Build, Inspect and Debug API Requests
Working with an API usually means switching between documentation, a terminal and your code. These tools cover the steps in between, and they run in your browser, so tokens and payloads you paste are not sent to us.
To put a request together, the API Request Builder turns a form into a cURL command and JavaScript fetch() code, while the HTTP Request Builder shows the raw HTTP message itself. The cURL Generator builds commands from options, and the cURL to Code Converter translates a copied cURL command into code for your language.
Working With Responses and Specs
- Tidy a response with the JSON Formatter, then extract values with the JSONPath Tester or JSON Pointer Tester.
- Check an API description with the OpenAPI / Swagger Validator and convert it between JSON and YAML.
- Prototype a frontend with the API Mock Response Generator.
When a call fails, the HTTP Status Code Lookup explains what the response code means.