offchain_localStorageSet - JSON-RPC Method

Description

Stores a value in the node's offchain worker local storage. This RPC is primarily for debugging custom offchain logic and is typically restricted to validator operators running trusted infrastructure.

Parameters

Parameter	Type	Required	Description
kind	string	Yes	Storage kind ("PERSISTENT" or "LOCAL")
key	string	Yes	Hex-encoded key
value	string	Yes	Hex-encoded SCALE-encoded value

Request Example

{
  "jsonrpc": "2.0",
  "method": "offchain_localStorageSet",
  "params": [
    "PERSISTENT",
    "0x6d795f6f6666636861696e5f6b6579",
    "0x01020304"
  ],
  "id": 1
}

Response Example

{
  "jsonrpc": "2.0",
  "result": null,
  "id": 1
}

The call returns null on success. Read back the value using offchain_localStorageGet.

Notes

• Only use this RPC on trusted nodes; writing arbitrary offchain values can influence custom logic executed by the node.
• Storage writes are not persisted across nodes—each node maintains its own offchain database.
• Combine with offchain worker metrics to validate job execution during staging deployments.