What is Field Mapping?
Field Mapping is The process of connecting data fields between two systems so information syncs to the right place.
Definition
Field mapping defines how data moves between systems. When you integrate HubSpot with Salesforce, you need to specify that HubSpot's 'Company Name' maps to Salesforce's 'Account Name', HubSpot's 'Job Title' maps to Salesforce's 'Title', and so on. Simple mappings are one-to-one, but real-world scenarios include many-to-one (multiple source fields into a single target), transformations (converting date formats or picklist values), and conditional logic (map differently based on record type).
Why It Matters
Bad field mapping is the #1 cause of integration failures. Data ends up in wrong fields, overwriting good values with bad ones. The worst cases are silent failures where data maps to the wrong field without errors, so nobody notices until a sales rep calls a prospect and references completely wrong information. Getting field mapping right during initial setup saves hundreds of hours of cleanup later.
Example
A company integrating Clay with Salesforce discovers that Clay's 'company_headcount' field returns ranges like '51-200' while Salesforce's 'Employees' field expects a number. They add a transformation rule that maps '51-200' to 125 (midpoint), '201-500' to 350, and so on, preventing the sync from breaking on data type mismatches.
Tools for Field Mapping
Find the Right Field Mapping Tool
Not sure which tool fits your needs? Check out our curated recommendations: