X12 834 N301 (Address Information): Format, Values, and Testing Notes
This field is free-form text, which means it's also the field most likely to contain something your parser wasn't expecting.
N301 is the primary street address line for whichever member the preceding NM1 segment identified. It's a required field whenever N3 appears in the loop, and unlike coded fields elsewhere in an 834, it's free-form text — so its content varies member to member rather than being drawn from a fixed list.
What this field needs to handle
Example
A synthetic N3 where N301=719 MAPLE AVE carries the street number and name for a member's mailing address.
Where this trips people up
Because N301 is free text rather than a coded value, generated test data tends to default to tidy, textbook-formatted addresses — always "NUMBER STREET NAME," always under twenty characters. Production files include PO boxes, rural route addresses, unusually long apartment complex names, and international-style formatting from members who moved abroad, all sitting in this same field. A parser or downstream mailing system tuned only to the tidy case can truncate long values or mishandle a PO box that doesn't fit the pattern it expects. Vary the length, format, and content of N301 in your test data instead of generating from one template.