Scope

This skill is for Domo Custom Connector IDE projects — not Domo App Platform custom app/card builds. Custom connectors run server-side after being published via the Connector Dev Studio.

File Structure

• authentication.js — Validates credentials and authenticates with the external API
• dataProcessing.js — Fetches and processes data from the external API
• README.md — Documents available reports and parameters

Key Patterns

Authentication

• Sanitize credential inputs (regex validate API keys/tokens) before use
• Set required headers, then make a lightweight test request to verify credentials
• Call auth.authenticationSuccess() or auth.authenticationFailed('reason') — never leave authentication ambiguous

Data Processing

• Check httprequest.getStatusCode() before parsing the response body
• Use datagrid.magicParseJSON(jsonArray) for JSON array responses — avoids manual column mapping
• Handle pagination in a do...while loop; use the next-page link or cursor from the response as the loop condition
• Use metadata.report to branch between report types; use metadata.account.* for credentials

Error Handling

• Catch HTTP errors by status code; try to parse the error body for a human-readable message
• Fall back to the raw response substring if the error body isn't parseable JSON
• Re-throw errors so the connector runtime surfaces them correctly

Rules

1. Input sanitization — Always sanitize inputs (API keys, user params) to prevent injection attacks
2. Consistent columns — Every row must have the same columns; use null for missing values
3. Domo library — Use Domo-provided methods (httprequest, datagrid, auth, metadata); see reference docs
4. Clear error messages — auth.authenticationFailed() messages should tell the user what to fix

Code Examples

If you need full boilerplate for authentication, data processing, or error handling patterns, read references/examples.md.

Checklist

• authentication.js validates input format and tests credentials
• authentication.js calls auth.authenticationSuccess() or auth.authenticationFailed() appropriately
• dataProcessing.js handles pagination correctly
• dataProcessing.js checks HTTP status codes before parsing JSON
• dataProcessing.js uses datagrid.magicParseJSON() for JSON arrays
• All inputs are sanitized
• Error messages are clear and actionable
• README.md documents all reports/parameters
• All rows have consistent column counts