V2JSON — V2X message decoder & encoder

Paste a hexadecimal V2X UPER stream and receive structured JSON — then edit the JSON and encode it back to UPER, with a byte-for-byte round-trip check. Supports CAM (Cooperative Awareness), DENM (Decentralized Environmental Notification), CPM (Collective Perception), VAM, MAPEM, SPATEM, SREM, SSEM, IVIM and RTCMEM messages as defined by ETSI EN 302 637-2, EN 302 637-3, TS 103 900, TS 103 831, TS 103 324, TS 103 300-3 and TS 103 301.

The interactive codec loads with JavaScript. The same functionality is available via the public REST API — /api/v1/decode, /api/v1/encode and /api/v1/verify — documentation at /docs.