Build JSON-RPC 2.0 request envelopes with method, params, and IDs. Talk to Ethereum nodes and RPC APIs correctly — local building, free, no signup.
Content reviewed October 2026 · About Toolzum
Build HTTP requests with method, URL, headers, and body — then generate matching curl commands. Prototype endpoints without leaving the tab — local, free, no signup.
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Converts JSON files to XML format — APIs, configuration files, and data exchange between web services to enterprise systems, SOAP APIs, document formatting, and legacy integration pipelines.
jsonrpc:'2.0', method string, params (array or object), and id — in that shape exactly. The builder assembles the envelope; you supply method and params.
Both valid: arrays for positional, objects for named. Ethereum (eth_call) uses positional arrays; check your server's docs.
Arrays of envelope objects with unique IDs resolve in any order — match responses by id, not position. Build batches for node efficiency.
No — building runs locally in your browser. Nothing leaves your device.
API Request Builder
Build HTTP requests with method, URL, headers, and body — then generate matching curl commands. Prototype endpoints without leaving the tab — local, free, no signup.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.