CSV to JSON Converter

Turn spreadsheet exports into clean JSON arrays — paste text or drop a file. Free in your browser — no sign-up, no watermarks.

Drop your CSV files here

or click to browse — Select multiple files for batch conversion

csvtsv

⚡ Instant — conversion starts the moment you add files. No sign-up, no watermarks. Why FileHugger

🔍 How your file is processed
Runs
In your browser on this page
Engine
In-browser JavaScript converters with no external libraries (XML parsing uses the browser's built-in DOMParser)
Max input
512 MB per file (or paste text directly)
Your file
Processed in this browser tab — the file is not uploaded. Converted results are kept in this browser's local storage for up to two hours so their matching download page can show them; expired results are removed on the next site visit. Nothing is stored on our servers.
Good to know
Format limits apply: nested JSON values are embedded as JSON text inside a single CSV cell (not expanded into columns), and CSV values are always imported as text — no number or boolean detection is attempted.

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Or paste your CSV content directly:

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How to convert CSV to JSON

  1. Click Choose files (or drag & drop) and select one or more CSV files. You can also paste the input text directly into the box below the uploader.
  2. Review the options (delimiter is auto-detected for CSV) — usually the defaults are exactly right.
  3. Press Convert to JSON. Each file is converted with a live progress indicator.
  4. Open the download page to save your files individually or grab everything as a single ZIP.

Why convert CSV to JSON?

APIs and JavaScript apps want JSON, spreadsheets give you CSV. This converter parses your CSV properly (quoted fields, embedded commas, semicolon and tab delimiters) and emits an array of objects keyed by the header row. Paste a snippet or drop a huge export — conversion starts instantly.

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What this tool preserves — and what it changes

✓ Preserved

  • Every row and cell — the first row becomes the JSON keys
  • Quoted fields with embedded commas, quotes and line breaks are parsed correctly

↺ Changed

  • All values arrive as strings: no number, boolean or date guessing — typing decisions belong to the code that consumes the JSON
  • Output is pretty-printed for humans; minify it downstream if bytes matter

Known limits & edge cases

  • Delimiter can be chosen explicitly (comma/semicolon/tab/pipe) when the default guess is wrong
  • Paste a three-line sample first for unusual dialects — the converter refuses malformed rows rather than guessing

Engine: In-browser JavaScript converters with no external libraries (XML parsing uses the browser's built-in DOMParser). These statements describe the engine as shipped on 2026-10-02 — behaviour changes are recorded in the changelog.

About the formats

What is a CSV file?

CSV is the simplest table format: one row per line, values separated by commas (or semicolons/tabs). Every spreadsheet app, database and analytics tool can import and export CSV, which makes it the lingua franca of tabular data. Its weakness is structure — no data types and no nesting — which is exactly what converting to JSON or XML adds.

What is a JSON file?

JSON is the standard data format of the modern web. APIs, config files and databases exchange structured data as JSON because it is human-readable, supports nesting, and maps directly to objects in every programming language. Converting between JSON and CSV, XML or YAML is everyday work for developers, analysts and anyone wiring two systems together.

CSV vs JSON at a glance

CSVJSON
TypeTabular dataStructured data
CompressionTextText
Typical useSpreadsheets, exports, data importsAPIs, configuration, data exchange

From spreadsheet rows to API-shaped data

CSV is where data lives in offices; JSON is what applications eat. This converter reads your CSV — delimiter auto-detected, so semicolon-separated European exports and tab-delimited dumps work without ceremony — and produces JSON with the header row as keys: each row becomes an object like {"name": "...", "email": "..."}, pretty-printed and ready for an API client, a seed script or a config import.

The header row is the contract: its exact spellings become your JSON keys, so a minute renaming columns in the spreadsheet (lowercase, no spaces) saves a mapping layer in code. Values arrive as strings — types like numbers and booleans are your code’s decision, since 00420 as a phone number and 420 as a quantity look identical in a CSV cell.

Frequently asked questions

Is this CSV to JSON converter free?

Yes — completely free, with no sign-up, no watermarks and no daily quota. Processing happens in this browser, so the practical limit is the memory available on your device.

Can I convert multiple CSV files at once?

Yes. Select or drop as many files as you like — each one is converted in sequence with its own progress status, and you can download the results individually or all together as a ZIP archive.

How are delimiters and quoted fields handled?

The parser auto-detects comma, semicolon, tab or pipe delimiters and fully supports RFC 4180 quoting — embedded commas, quotes and even line breaks inside quoted fields are parsed correctly. You can also force a specific delimiter in the options.

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