CounterString icon

CounterString

by eviltesterapps · Developer Tools
Manifest V3 Free
View in Chrome Web Store Data as of 16 Oct 2026

CounterString and text generation for Exploratory Testing

Users
127
+13 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#77K
#64K among extensions
Version
0.4.1
updated 20 Jan 2026

Users

monthly, 3 years
30130229Aug 2023Apr 2025Oct 2026
Latest, 16 Oct 2026: 127 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
001Aug 2023Apr 2025Oct 2026
Latest, 16 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About CounterString

A CounterString is a string of text e.g. `*3*5*7*9*12*15*` where: - the string is a specific length e.g. 15 - the last character in the string is an * - the numbers before each * are the position of the * This can act as Test Data for helping test the length allowed in forms and other data fields. If the value is truncated then you can tell from the numbers and the '*' how long the string is e.g. `*3*5*7*9*12*15` is 14 characters long because the '*' after 15 is missing. CounterStrings are commonly used in exploratory testing. This extension is a simple CounterString generator, which: - displays a dialog asking for the number of characters, - then generates a CounterString of that length - generated data can be copied directly to the clipboard (default) - the CounterString is logged to the dev console to allow later copy and pasting, - the extension can insert the CounterString into the value of the field that was selected when the right click context menu was displayed, the extension can also 'type' the values. - this supports supports testing online forms. - if a field has a maxlength, then this is used as the default for CounterString generation NOTE: human copy and paste data triggers the browsers default input validation and behaviour. Generate and Type can bypass some validation rules, making this suitable for edge case testing. Additional Features: - generate and type random data generated from Regex - generate and type ranges of characters - generate and type repeated text, characters or regex generated data - explore boundary chop ranges - useful for hunting down boundary length conditions Instructions for use: - right click on an input field - choose Generate CounterString - enter value of CounterString - CounterString will be logged to the console (use dev tools to see it) - CounterString will be inserted as the value of the WebElement you clicked on You can also choose to 'type' CounterStrings - this will issue keydown and keyup events to type the string character by character. Note: - works with forms on the actual page - this extension does not work with forms embedded in frames This is open source and source can be found at GitHub: - https://github.com/eviltester/counterstringjs

Growth

WindowUsersChangeRatingsRating
7 days+7+5.8%00.00
30 days+13+11.4%00.00
6 months+6+5.0%00.00
1 year+23+22.1%00.00

Chrome Web Store search rankings

Where CounterString appears when people search the store, with the 30 day change
Search phrasePosition30 days
string#23+4

Version history

6 versions recorded
0.4.120 Jan 2026
0.4.04 Jan 2026
0.3.11 Jan 2026
0.331 Dec 2025
0.222 Dec 2025
0.121 Mar 2019

Details

Category
Developer Tools
First seen
21 Mar 2019
Size
49 KB
Languages
en-GB
Pricing
Free
Privacy policy
eviltester.com
Extension ID
keklpkmokeicakpclclkdmclhgkklmbd

Permissions and risk

Minimal riskimpact 0, likelihood 2
Permissions
contextMenusactiveTabscripting

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