known services to validate csv file
I recently came across Google Refine (now OpenRefine) - it's not a service for validating CSV files, it's a tool you download locally, but it does provide a lot of tools for working with data and detecting anomalies.
As mentioned in a reply, "CSV" has become an ill-defined term, principally because people don't follow the One True Way when using delimiter separated data
http://www.catb.org/~esr/writings/taoup/html/ch05s02.html
EDIT/UPDATE (2016-08-09):
CSV Currently Becoming a Well-Defined Term by the W3C CSV Working Group
The National Archives developed a CSV Schema Language and CSV Validator, software written in Java. It's open source.
The Open Data Institute is developing a CSV validation service that will allow users to check the structure of their data as well as validate it against a simple schema.
The service is still very much in alpha but can be found here:
http://csvlint.io/
The code for the application and the underlying library are both open source:
https://github.com/theodi/csvlint
https://github.com/theodi/csvlint.rb
The README in the library provides a summary of the errors and warnings that can be generated. The following types of error can be reported:
:wrong_content_type-- content type is not text/csv:ragged_rows-- row has a different number of columns (than the first row in the file):blank_rows-- completely empty row, e.g. blank line or a line where all column values are empty:invalid_encoding-- encoding error when parsing row, e.g. because of invalid characters:not_found-- HTTP 404 error when retrieving the data:quoting-- problem with quoting, e.g. missing or stray quote, unclosed quoted field:whitespace-- a quoted column has leading or trailing whitespace
The following types of warning can be reported:
:no_encoding-- the Content-Type header returned in the HTTP request does not have a charset parameter:encoding-- the character set is not UTF-8:no_content_type-- file is being served without a Content-Type header:excel-- no Content-Type header and the file extension is .xls:check_options-- CSV file appears to contain only a single column:inconsistent_values-- inconsistent values in the same column. Reported if <90% of values seem to have same data type (either numeric or alphanumeric including punctuation)