Standardize US Phone Numbers: Multiple Formats & Validation
Validates and standardizes US phone numbers from various inputs, handles extensions, and outputs in E.164, national, and other formats for seamless data cleaning.
This n8n workflow automates the standardization of US phone numbers, accepting inputs in common formats like (555) 123-4567, 555.123.4567, +15551234567, or with extensions like 5551234567x890. It strips non-numeric characters, validates the core 10-digit number (with optional +1 or 1 prefix), and generates multiple standardized outputs if valid.
The workflow first parses the input to separate the main number and any extension. Validation ensures US compliance: correct length after stripping and proper country code handling. Invalid numbers are flagged, preventing downstream errors in automations.
Outputs include: Number Only (5551234567), E.164 (+15551234567), National ((555) 123-4567), Full National (1 (555) 123-4567), International (00-1-555-123-4567), plus extension as number or string. This ensures consistency across systems.
Benefits include time-saving data cleaning, reduced errors in SMS/CRM integrations, and reliable form validation. Use cases: CRM standardization, pre-SMS formatting, HR data entry validation, and e-commerce customer profiles.
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How to import this workflow into n8n
- 1Purchase or download the workflow to get the n8n workflow JSON file.
- 2In your n8n instance, open Workflows and choose "Import from File" (or paste the JSON with Ctrl+V on the canvas).
- 3Open each node marked with a credential warning and connect your own accounts and API keys.
- 4Run the workflow once manually to verify the data flow, then toggle it to Active.
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