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Build, inspect, and debug HTTP, OpenAPI, URLs, user agents, headers, robots rules, and network data.
11 tools
Paste an OpenAPI/Swagger JSON spec to visualize your API endpoints.
Decode raw User-Agent strings to identify browser, engine, OS, CPU, and device details.
Searchable reference for all HTTP status codes with descriptions.
Calculate network, broadcast, host ranges, and masks from IPv4 CIDR blocks.
Parse URLs into components and interactively edit query parameters.
Build HTTP requests visually and generate cURL, JavaScript fetch, or Python code.
Convert cURL commands to JavaScript, Python, Go, PHP, or Rust code.
Parse and test robots.txt rules against URLs to check crawler access.
Compare HTTP headers side by side and highlight differences.
Paste an OpenAPI spec and generate mock responses for each endpoint.
Inspect browser HAR exports locally and redact headers, cookies, query strings, bodies, and response content before sharing.