Example
ReferenceLoad a sample list and settings.
Input
alpha
beta
---
missing value
Input
0 characters · 0 lines
Output
Output will appear here.
Tool options
Examples
🔒 Processed locally in your browser
Chain with…
These tools accept list output. Run this tool to enable one-click hand-off.
List
About Add Errors to List
Add Errors to List is a List tool that takes list input and returns list output. It runs entirely in your browser, so your input never leaves your device.
- Input
- list input
- Output
- list output
- Where it runs
- In your browser
- Chainable
- Yes
- Options
- 3 configurable
- Examples
- 1 in the catalog
Benefits
- Processed locally in your browser
- Accepts pasted text
- Input can come straight from your clipboard
- Download the result as a file
- Chain the output directly into another tool
Step by step
How to use Add Errors to List
5 steps, all from the panel above — nothing leaves your browser.
Paste your input
Type or paste your list into the input panel above — it keeps a running character and line count as you type.
Set the options
Adjust the 3 tool options — Error prefix, Keep items without errors, Separator.
Run the tool
Run it — the work happens in your browser, so nothing is uploaded.
Collect the result
The result appears in the output panel as list output. From there you can download it as a file.
Chain it onward
The chain panel lists tools that accept this output; sending the result opens the next tool with its input already filled in.
Formats
Supported formats
What Add Errors to List accepts and what it hands back.
Accepts
Pasted list content; no file upload is involved.
Produces
Returned as list output; no specific file format is declared for it. From the output panel you can download it as a file.
Configuration
Error prefix
text · default ERROR:
Keep items without errors
boolean · default true
Separator
text · default —
Examples
Examples and use cases
1 catalog example for Add Errors to List. Runnable examples can be loaded from the examples panel above.
Related tools
Sort a List
Sort list items alphabetically, numerically, or by length, with duplicate and whitespace handling.
ListIn-browser
Reverse a List
Reverse the order of list items, one per line.
ListIn-browser
Find Unique List Items
Find items that appear exactly once in a list.
ListIn-browser
Find Duplicate List Items
Find items that appear more than once, optionally with counts.
ListIn-browser
Find the Length of a List
Count total, unique, and duplicate items in a list.
ListIn-browser
Randomize a List
Shuffle list items into a random order.
ListIn-browser
FAQ
Frequently asked questions
Answers for Add Errors to List, taken from the tool's own catalog definition.
Does Add Errors to List run in my browser or on a server?
It runs entirely in your browser — the work happens on your device.
What input does Add Errors to List accept?
list input.
What do I get back, and what can I do with it?
The result is list output. From the output panel you can download it as a file.
Can I chain Add Errors to List into another tool?
Yes. After a run, the chain panel lists tools that accept list output (12 compatible tools in the catalog right now) and hands the result across with one click.
Does Add Errors to List need any configuration?
Yes — the tool options panel above exposes 3 settings: Error prefix, Keep items without errors, Separator.
Do I need an account?
No. Accounts only add conveniences: favourites, recent-tool history and saved workflows.
What is included with Add Errors to List?
Processed locally in your browser; Accepts pasted text; Input can come straight from your clipboard; Download the result as a file; Chain the output directly into another tool.
Get started
Start using Add Errors to List
The tool is ready above — add your list and run it. It all happens in your browser, so nothing is uploaded.