CSV to JSON Converter

Convert between CSV and JSON formats

Options:

About CSV & JSON

CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most common data interchange formats. Converting between them is a frequent task in data processing and API development.

What is CSV to JSON Converter?

The CSV to JSON converter is a free online tool that transforms data between the two most common interchange formats: CSV (Comma-Separated Values) and JSON (JavaScript Object Notation). Conversion works in both directions, so you can turn spreadsheet-style CSV into structured JSON for an API, or flatten JSON back into CSV for a spreadsheet. By default the first row of your CSV becomes the keys of each JSON object, but you can switch to a headerless mode that emits a plain array of arrays instead. A flexible delimiter selector covers comma, semicolon, tab, and pipe, plus a custom-character option for unusual files. On the output side you can choose a pretty-printed array, a minified single line, NDJSON (one record per line), or a JSON object keyed by any column you name. Optional toggles infer types so numbers, booleans, and null become real JSON values, trim whitespace, and skip blank rows. Everything runs in your browser, with no signup.

How to use CSV to JSON Converter?

Converting between CSV and JSON takes only a moment:

  1. 1 Paste your data into the appropriate pane: CSV on one side or JSON on the other. Sample data is provided so you can see the expected shape.
  2. 2 Set your options. Choose the delimiter that matches your CSV (comma, semicolon, tab, pipe, or a custom character), pick how the header row is handled, and select the output format.
  3. 3 Tune the toggles. Turn type inference on to parse numbers, booleans, and null automatically, enable whitespace trimming, and skip empty rows so blank lines do not become empty records.
  4. 4 Click the conversion button to transform CSV to JSON or JSON to CSV. JSON input may be a standard array, an array of arrays, or NDJSON.
  5. 5 Copy the formatted output from the result pane with one click, ready to drop into your code, API request, or spreadsheet.

Why use this tool?

Data rarely arrives in the exact format you need. Spreadsheets and exports tend to be CSV, while web APIs and JavaScript applications expect JSON, so converting between them is a frequent chore. Doing it by hand is tedious and error-prone, especially with quoting, delimiters, and mixed types. This tool automates the conversion both ways in an instant. It uses your CSV headers as JSON keys, or drops them for an array of arrays, and respects whatever delimiter your file uses. Type inference turns numeric and boolean columns into proper JSON values, while whitespace trimming and empty-row skipping clean up messy exports. The output menu switches between a pretty array, a minified string, streamable NDJSON for data pipelines, and a lookup object keyed by an ID column. Because it runs entirely in your browser, your data is never uploaded, keeping it private and fast. It is free and needs no account.

Examples

Preparing data for an API

Convert an exported CSV of users into a JSON array of objects with type inference on, so ages and prices arrive as real numbers ready for an API request.

Exporting JSON to a spreadsheet

Turn a JSON response from an API into CSV so you can open it in a spreadsheet, sort it, and build charts.

Handling European CSV files

Choose the semicolon or pipe delimiter to correctly parse a CSV exported from software that uses ; or | between fields.

Streaming records as NDJSON

Pick the NDJSON output format to emit one JSON object per line, the shape expected by log processors and bulk-import APIs.

Building a lookup table

Use the keyed-object format and name an ID column to produce a JSON object where each record is indexed by its key.

Frequently Asked Questions

Is the CSV to JSON converter free to use?

Yes. The tool is completely free with no signup, no limits, and no account required.

Does it convert in both directions?

Yes. The conversion is bidirectional. JSON input can be a standard array of objects, an array of arrays, or NDJSON.

Can numbers and booleans be parsed instead of strings?

Yes. Turn on type inference and the converter parses numbers, true, false, and null into real JSON values. Leave it off to keep every field as a string.

What output formats are available?

A pretty-printed JSON array, a minified single line, NDJSON (JSON Lines) with one record per line, or a JSON object keyed by a column you name.

How are CSV headers handled?

By default the first row becomes the keys for each JSON object. You can switch to a no-header mode that outputs a plain array of arrays instead.

Can I use a delimiter other than a comma?

Yes. You can choose a comma, semicolon, tab, or pipe, or type any custom single character as the delimiter to match the format of your source CSV file.

Is my data uploaded anywhere?

No. All conversion happens in your browser, so your data is never sent to or stored on a server, keeping it private.

Related Tools

Explore more free tools you might find useful