Form Field Name Edge Cases (CSV)
Fifteen awkward field names with the urlencoded key each produces: brackets, array notation, spaces, plus signs, ampersands, equals signs and three non-ASCII scripts including an astral emoji.
field_name,shape,urlencoded_key,note
email,plain,email,the ordinary case
user.email,dotted,user.email,a dot is an ordinary character in a form name
user[email],bracket,user%5Bemail%5D,brackets are percent-encoded on the wire
tags[],array,tags%5B%5D,repeated to build a list
items[0][sku],indexed,items%5B0%5D%5Bsku%5D,an explicit index inside brackets
a b,space,a+b,a space becomes a plus in urlencoded bodies
a+b,plus,a%2Bb,a literal plus must be percent-encoded
a&b,ampersand,a%26b,an ampersand would otherwise end the pair
a=b,equals,a%3Db,an equals sign would otherwise start the value
_leading_underscore,underscore,_leading_underscore,legal and common
123numeric,numeric prefix,123numeric,"legal in HTML, awkward in some frameworks"
имя,non-ascii,%D0%B8%D0%BC%D1%8F,"UTF-8 bytes, percent-encoded"
名前,non-ascii,%E5%90%8D%E5%89%8D,three bytes per character
emoji_🧪,non-ascii,emoji_%F0%9F%A7%AA,four bytes for the astral character
isindex,reserved-ish,isindex,"historically special, ordinary today"
Specifications
- Rows
- 15
- Columns
- 4
- Header
- true
- Encoding
- UTF-8
What is a .csv file?
CSV (Comma-Separated Values) is a plain-text tabular format where rows are lines and fields are separated by commas, with quoting rules for values that contain delimiters, quotes, or newlines. It has no formal type system and depends on encoding and dialect conventions. It is the most portable format for tabular data exchange.
How to use this file
Use an example CSV to test parsers against quoting and embedded-delimiter edge cases, header handling, encoding detection, and import pipelines into databases or spreadsheets.
How to use this file for testing
“Form Field Name Edge Cases (CSV)” is a deterministic Novus Examples fixture for Form parsing, Form testing, CSV parsing. PDF AcroForms with documented fields and live HTML forms for testing form parsers and fillers.
Documented properties for this file: 15 rows · 4 columns · UTF-8. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This form is fictional SAMPLE content for tooling tests (autofill, scrapers, PDF fillers). It is not an official government, bank, or clinic form. Open the HTML offline or fill the PDF in any viewer; the demo submit path never stores data.
Code examples
import pandas as pd
df = pd.read_csv("form-field-name-edge-cases.csv")
print(df.head())
print(df.dtypes)Related files
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Generated by generation/forms_p7.py. Free for any use, no attribution required — license.