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/jsonrpc

well-formed JSON-RPC 2.0 response — jsonrpc version present, id matching the implied request, result present without error.

chaos chaos.catastrophic.io

GET /jsonrpc

Returns JSON-RPC 2.0 responses with spec-level violations. Default omits the required `jsonrpc` version field. Use ?mode= to isolate other violations: mismatched response id, both result and error present, or a reserved-but-unassigned error code.

modes: version-missing id-mismatch result-and-error error-code-invalid

full chaos docs →

control not.catastrophic.io

GET /jsonrpc

well-formed JSON-RPC 2.0 response — jsonrpc version present, id matching the implied request, result present without error.

full control docs →

Build against not.catastrophic.io/jsonrpc, then flip the hostname to chaos.catastrophic.io to exercise the chaos.