String to Array Converter

Split any delimited string into a JSON or JavaScript array with trim, dedupe, and formatting options. Free, browser-based, and built for everyday development tasks.

Browser-basedFree foreverNo signup required3 min read

Quick Answer

The String to Array Converter splits delimited text into an array — by comma, newline, space, tab, semicolon, or a custom delimiter — with trim, empty-removal, and dedupe options, output as JSON, a JS literal, lines, or quoted CSV.

About String to Array Converter

Turning a blob of delimited text into a clean array is a constant micro-task: a comma-separated ID list from a spreadsheet that needs to become a JSON array for an API call, a column of values that should be a JavaScript literal, tags typed with inconsistent spacing that need deduplicating. This converter handles the split, cleanup, and output formatting in one pass, showing the item count so you can sanity-check the result before copying.

Why use this tool?

  • API payloads — convert spreadsheet columns or CSV fragments into JSON arrays for request bodies
  • Code literals — produce ready-to-paste JavaScript array syntax from any delimited list
  • SQL IN clauses — output quoted CSV for WHERE id IN (...) queries
  • List cleanup — trim whitespace, drop blanks, and deduplicate in a single conversion
  • Format switching — go from one-per-line to comma-separated (or back) without a regex

How it works

  1. 1Paste your delimited text into the input
  2. 2Choose the delimiter to split on — or "Custom" for anything else (like | or ::)
  3. 3Toggle trim, remove-empty, and dedupe options to clean the items
  4. 4Pick the output format and click Convert — the item count and formatted array appear instantly

Common mistakes to avoid

  • Values containing the delimiter — splitting "Smith, John" on commas produces two items; if your values can contain commas, use a different delimiter or a real CSV parser
  • Forgetting to trim — " b" and "b" are different strings; without trimming, dedupe and downstream comparisons silently miss matches
  • Quote style mismatch — JSON requires double quotes while most JS style guides prefer single; pick the output format matching the destination instead of find-replacing quotes afterwards
  • Windows line endings — pasted text may contain \r\n; this tool splits on both, but hand-rolled split("\n") code leaves trailing \r characters on every item

Pro tip

The quoted-CSV output drops straight into SQL: WHERE email IN (<paste>). For the reverse direction — array back to plain text — convert with "One per line" and you have spreadsheet-ready data.

Frequently Asked Questions

What is the String to Array Converter?
The String to Array Converter splits any delimited text — comma-separated values, lines, spaces, tabs, or a custom delimiter — into an array, output as JSON, a JavaScript array literal, one item per line, or quoted CSV.
How do I use the String to Array Converter?
Paste your text, choose the delimiter to split on and the output format, toggle trim/empty/duplicate options as needed, and click Convert. The item count and formatted array appear with a copy button.
Is my data private?
Yes. Splitting and formatting run entirely in your browser. Nothing is ever sent to a server.
What do the trim, empty, and duplicate options do?
"Trim items" strips whitespace around each item (so "a, b , c" gives clean values). "Remove empty" drops zero-length items caused by double delimiters or trailing separators. "Remove duplicates" keeps only the first occurrence of each value — handy for building unique lists.
Which output format should I pick?
JSON array for API payloads and config files; JS array (single quotes) for pasting into JavaScript/TypeScript source; one-per-line for spreadsheets and further text processing; quoted CSV for SQL IN (...) clauses and CSV imports where values may contain commas.

Related Workflows

String to Array Converter for Data CleaningString to Array Converter for Data MigrationString to Array Converter for Data AnalysisString to Array Converter for Api TestingString to Array Converter for Documentation

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Compare

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Tool Trust & Transparency

Ecosystem Trust Center

Processed in

Your browser

Input never sent to any server

Input stored

No

No logs, no accounts required

Common use cases

  • Format, validate, or transform code and data without leaving your browser
  • Debug encoding, decoding, or conversion issues quickly
  • Generate test data or convert between formats in development workflows

Limitations

  • Operates entirely in your browser — large inputs may slow older devices
  • Output is a best-effort conversion; always validate critical results independently

Last verified: 2026 · Free, no account required · Validate critical output independently

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