Redis Enhanced

Overview

The node "Redis Enhanced" provides a comprehensive interface to interact with a Redis database, supporting a wide range of operations such as appending data to strings, setting and getting keys, managing hashes, lists, sets, sorted sets, and executing Lua scripts. The "Append" operation specifically appends a given value to the end of an existing string stored at a specified key in Redis.

This node is beneficial in scenarios where you need to manipulate Redis data directly within an n8n workflow, for example:

• Appending logs or incremental data to a Redis string key.
• Building up messages or accumulating values over time without overwriting existing data.
• Integrating Redis-based caching or state management into automation workflows.

Practical example: You have a Redis key storing a log string, and each time an event occurs, you append a new log entry to this string using the Append operation.

Properties

Note: For the Append operation, only "Key" and "Value" are required and used.

Output

The output JSON object for the Append operation contains:

• key: The Redis key to which the value was appended.
• newLength: The new length of the string after the append operation.

Example output:

{
  "key": "myKey",
  "newLength": 42
}

This indicates that the value was successfully appended and the resulting string length is 42 characters.

The node does not output binary data for this operation.

Dependencies

• Requires a Redis server accessible via credentials configured in n8n.
• Needs an API key credential or connection details for Redis authentication.
• Uses the Redis client library internally to perform commands.
• No additional external services are required beyond Redis itself.

Troubleshooting

• Common issues:

  • Connection failures due to incorrect Redis credentials or network issues.
  • Attempting to append to a key holding non-string data types may cause errors.
  • Providing invalid or empty keys or values will result in errors.

• Error messages:

  • "Invalid JSON in value": Occurs if JSON parsing is attempted on malformed input (relevant for hash operations).
  • Redis command errors: May occur if the key type is incompatible with the append operation.

• Resolutions:

  • Verify Redis credentials and connectivity.
  • Ensure the key exists and holds a string or is empty before appending.
  • Provide valid string values for appending.
  • Use the "continue on fail" option to handle errors gracefully in workflows.

Links and References

• Redis APPEND Command Documentation
• Redis Official Website
• n8n Documentation