How to format a long list into a JSON Array?

Question

Sneha Gupta · Answer 1

Sneha Gupta • March 27, 2026

I use the Online Text Joiner for this exact task. It has a special "Prefix" and "Suffix" feature that handles the quotes for you. You just have to paste your list and click one button.

1

Delete

Sneha Gupta • March 27, 2026

The tool has a "Trim" feature for those extra spaces. Here is exactly how you should set it up:
1. Input: Paste your city names (one per line).
2. Join with: Select Comma ( , ).
3. Add Prefix: Type " (double quote).
4. Add Suffix: Type " (double quote).
5. Switches: Make sure Trim spaces from items is ON.
After clicking Join Text, your output will look like this:
"Mumbai","Delhi","Bangalore","Pune"
You just need to add the square brackets [ and ] at the very start and end.

1

Delete

Vikram · Answer 2

I used this tool for my Instagram marketing list today. I had a huge list of 500 usernames and many of them were repeated because I copied them from different posts.
There is a toggle called Remove duplicate items. I turn that ON, the tool will automatically check your whole list and keep only one copy of each name.
Here is a quick example of how it cleans the data:
Input:
@user1
@user2
@user1
@user3
Settings: Remove duplicates ON, Separator: Space.
Output:
@user1 @user2 @user3

How to format a long list into a JSON Array?

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How to format a long list into a JSON Array?