Validate, build and simulate OCPP 1.6J and 2.0.1 messages — no servers, no accounts, no uploads. Everything runs in your browser.
[2, "boot-001", "BootNotification", "chargePointVendor": "VendorX", "chargePointModel": "Model-22", "firmwareVersion": "1.4.3" ]
Paste any OCPP frame and get instant validation — frame structure, payload schema, field types, enum values.
Generate valid OCPP messages with a guided form. Select an action, fill required fields, get a copy-ready JSON frame.
Connect to your CSMS over WebSocket and run real OCPP flows — boot, authorize, start and stop transactions.
Most deployed JSON-over-WebSocket version. Complete tool suite available today.
Latest stable — TransactionEvent, Variables, richer idToken. Validator and Builder live.
Newest release — bidirectional charging, ISO 15118-20 support. Reference pages first.
One page per action — schema, required fields, valid example frames, common errors, and one-click jumps into the Validator or Builder.
Frames never leave your browser. No uploads, no accounts, no logs.
Everything runs locally. Paste and validate in under 20 ms.
Validation uses the official JSON Schemas — not hand-rolled heuristics.
No sign-ups, no subscriptions, no rate limits. Use it as much as you need.
No install. No account. Paste, press validate, move on.