Filter Connector

Overview

The Filter connector filters keys from the payload using whitelist or blacklist modes.

Connector Type: MeddleFilter

Whitelist Mode

Pass only specified keys:

{
  "type": "MeddleFilter",
  "config": {
    "mode": "Whitelist",
    "keys": ["temperature", "pressure"]
  }
}

Input:

{
  "temperature": 25.5,
  "pressure": 101.3,
  "humidity": 60,
  "debug_info": "..."
}

Output:

{
  "temperature": 25.5,
  "pressure": 101.3
}

Blacklist Mode

Remove specified keys:

{
  "type": "MeddleFilter",
  "config": {
    "mode": "Blacklist",
    "keys": ["debug_info", "internal_id"]
  }
}

Input:

{
  "temperature": 25.5,
  "pressure": 101.3,
  "debug_info": "...",
  "internal_id": 123
}

Output:

{
  "temperature": 25.5,
  "pressure": 101.3
}

Use Cases

1. Remove sensitive data before sending to external systems
2. Reduce payload size for bandwidth optimization
3. Extract specific fields for targeted processing

Best Practices

• Place Filter connectors early in workflows to reduce data volume
• Use Whitelist for security-sensitive data flows
• Use Blacklist for removing debug/internal fields

Related Connectors

• Reshape - Transform field names and values
• Conveyor - Pass data unchanged