How is this different from List Separator Changer?

List Separator Changer has two preset separator selectors (input and output, each newline/comma/custom). This tool has one separator for splitting the input, and a free-text glue field for joining, so the glue can be anything, like " | " or " -> ", not just one of the three preset kinds.

Can the glue be empty?

Yes, an empty glue string concatenates all items with nothing between them, the same result as List Separator Remover.

Can the glue contain multiple characters, like " and "?

Yes, the glue is any text you type, so "a", "b", "c" with glue " and " produces "a and b and c".

Does this trim whitespace from items before joining?

No, items are joined exactly as split, without trimming, so any whitespace already inside an item is preserved in the output.

List Item Joiner - Join List Items with a Custom Glue String

Overview

Introduction

Joining a list's items with something other than a comma or newline, like an arrow, a pipe, or a custom word, usually means either hand-editing the text or reaching for a script.

This tool does exactly what Array.prototype.join() does in code: split a list, then glue the pieces back together with any string you choose.

What Is List Item Joiner?

A bulk text tool that splits input on a chosen separator, then joins the resulting items into one string using an arbitrary glue string.

It mirrors JavaScript's Array.prototype.join() method directly, giving you the same free-form glue behavior without writing any code.

How List Item Joiner Works

The input is split into items using the selected separator (newline, comma, or a custom delimiter).

The items are then joined into a single string with `Array.prototype.join(glue)`, inserting your chosen glue string between every pair of adjacent items.

When To Use List Item Joiner

Use it whenever you need list items combined with a delimiter that isn't one of the three preset separator kinds, like " | " or " -> ".

It's a fast way to turn a pasted list into a single sentence-like string, e.g. joining with ", and " for a natural-language listing.

Often used alongside List Separator Changer, List Separator Remover and List to Rows Converter.

Features

Advantages

Accepts any free-text glue string, not limited to the three preset separator kinds used elsewhere in this category.
Directly mirrors the well-known `Array.prototype.join()` behavior developers already expect.
Works on newline-, comma-, or custom-delimited input before joining.

Limitations

Doesn't reparse or reformat items, it takes them exactly as split; trim or clean them first if needed.
A single glue string is applied uniformly between every item; it can't insert a different glue for the last item (like "a, b, and c") automatically.

Examples

Joining with a pipe

Input

a
b
c

Output

a | b | c

Separator is newline; the three items are joined with the glue string " | ".

Joining with an arrow

Input

step1,step2,step3

Output

step1 -> step2 -> step3

Separator is comma; the split items are joined with the glue string " -> " instead of the default comma spacing.

Best Practices & Notes

Best Practices

Use List Separator Changer instead if the glue you want is actually just a different preset separator (newline, comma, or custom) rather than an arbitrary string.
Include surrounding spaces in the glue field itself (e.g. " | " not "|") if you want spacing around the delimiter in the output.

Developer Notes

Splits with the shared `splitListItems` helper, then calls the resulting array's native `.join(glue)` directly rather than the shared `joinListItems` helper, since the glue is arbitrary free text rather than one of the three preset `ListSeparator` kinds.

List Item Joiner Use Cases

Building a breadcrumb-style string like "Home > Products > Shoes" from a list of path segments
Turning a list into a natural-language sentence with glue like ", " or " and "
Joining code identifiers with "::" or "." to build a qualified name

Common Mistakes

Forgetting to include spaces in the glue field when spacing around the delimiter is wanted in the output.
Using this tool when List Separator Changer's preset comma/newline/custom rejoin would be simpler for a standard delimiter swap.

Tips

Leave the glue field empty to concatenate items with nothing between them.
Pair with List to Rows Converter if you also want the joined groups wrapped onto multiple lines.

List Item Joiner