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Hazuu Tools

CSV to JSON Converter

Convert CSV data to JSON format — paste, configure, and copy instantly.

Input CSV
Output JSON
Converted JSON will appear here...
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About CSV to JSON Converter

CSV to JSON Converter takes comma-separated values and produces a structured JSON document your code can consume directly. When the header option is on, each row becomes a JSON object whose keys come from the first-row column names — ideal for feeding data into REST APIs, Node.js scripts, or front-end components that expect an array of records. When headers are off, every row becomes an array, giving you a compact two-dimensional structure for matrix operations or bulk imports.

Under the hood the tool uses PapaParse, the most widely used CSV parsing library in the JavaScript ecosystem. PapaParse handles the edge cases that trip up naive parsers: quoted fields that contain commas or newlines, RFC 4180 escaped double-quotes, and inconsistent trailing newlines. You can switch between comma, semicolon, tab, and pipe delimiters to match your exact file format, and choose 2- or 4-space JSON indentation to match your project style guide.

All conversion runs entirely inside your browser — no file upload, no server call, no account required. Sensitive spreadsheets, internal pricing tables, or customer export files never leave your machine. The tool is completely free with no usage limits.

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Key Features

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Header row to object keys

Enable the Header toggle and the first CSV row becomes property names in every JSON object, so downstream code can reference fields by name instead of by index.

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Array-of-arrays fallback

Disable headers to get a plain nested array — useful for numeric datasets, matrix operations, or systems that map columns by position rather than by name.

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Four delimiter options

Switch between comma, semicolon, tab, and pipe with a single click to match your file without editing the raw text first.

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RFC 4180 compliant parsing via PapaParse

Quoted fields containing commas, embedded newlines, and escaped double-quotes are all handled correctly according to the CSV standard.

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Configurable JSON indentation

Choose 2-space or 4-space indentation so the output matches your project style guide or lint rules before you paste it into version control.

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100% client-side and private

Conversion happens in your browser. No data is uploaded to a server, making it safe for confidential spreadsheets, internal reports, or any data you cannot share externally.

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How to Use

01

Paste CSV

Copy your CSV data and paste it into the left input pane.

02

Configure

Choose your delimiter and toggle the header option as needed.

03

Convert & Copy

Click Convert to generate JSON, then use the copy button to grab your result.

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Example

With the Header toggle on, the first row becomes object keys. Each subsequent row maps to one JSON object in the output array.

CSV input
name,age,city
Alice,30,New York
Bob,25,London
Carol,35,Sydney
JSON output
[
  {
    "name": "Alice",
    "age": "30",
    "city": "New York"
  },
  {
    "name": "Bob",
    "age": "25",
    "city": "London"
  },
  {
    "name": "Carol",
    "age": "35",
    "city": "Sydney"
  }
]
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Common Use Cases

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    Seeding a REST API or database

    Export a spreadsheet, convert it to a JSON array, and POST each object to your API endpoint or bulk-insert into a database without writing a custom ETL script.

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    Loading mock data into a front-end app

    Turn a product catalog, pricing table, or test dataset from CSV into a JSON array that a React or Vue component can import and render immediately.

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    Transforming data pipeline exports

    Analytics platforms and data warehouses often export query results as CSV. Convert them to JSON to feed downstream tools that only accept structured objects.

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    Preparing data for a configuration file

    Teams sometimes maintain reference data (country codes, tier lists, feature flags) in a spreadsheet. Convert to JSON and commit the result directly into your config directory.

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    Debugging a CSV export before integration

    Paste an export from an unknown system and inspect the parsed JSON to verify column names, data types, and edge-case values before wiring up your integration code.

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Frequently Asked Questions

What is CSV to JSON Converter? expand_more
CSV to JSON Converter is a free online tool that transforms tabular CSV data into structured JSON format. When headers are enabled, it produces an array of objects with named properties matching the first row. When headers are disabled, it returns an array of arrays where each inner array represents one row.
How does the header option work? expand_more
When the Header toggle is on (the default), the first row of your CSV is used as property names for each JSON object. For example, a row "name,age" produces objects like {"name": "Alice", "age": "30"}. When the toggle is off, all rows including the first are treated as data and the output is a nested array.
What delimiters are supported? expand_more
The tool supports four common delimiters: comma (,), semicolon (;), tab, and pipe (|). Select the one that matches your file using the delimiter selector in the toolbar. Tab-delimited files (TSV) are common exports from Excel and Google Sheets when you choose "Tab" as the separator.
Is my data secure? expand_more
Yes. All conversion is performed entirely in your browser using PapaParse. No data is ever sent to a server, so confidential spreadsheets, internal pricing tables, and customer exports remain completely private.
Can it handle quoted fields with commas inside them? expand_more
Yes. PapaParse correctly handles quoted fields that contain commas, embedded newlines, and escaped double-quotes, following the RFC 4180 CSV specification. For example, a field like "Smith, John" will parse as a single value, not two separate columns.
Why are all values strings in the JSON output? expand_more
CSV has no type system — every value is plain text. PapaParse returns values as strings to faithfully represent the source. If you need numeric or boolean types, apply a transformation step in your code after importing the JSON (for example, using parseInt or a schema validation library).
How is this different from the CSV Parser tool? expand_more
The CSV Parser tool renders your CSV as an interactive HTML table so you can visually inspect and explore the data. This CSV to JSON tool produces machine-readable JSON output intended for use in code, APIs, or config files. If you want to see your data in a grid, use the CSV Parser; if you need a JSON file to import into an application, use this tool.
How is this different from the JSON to CSV tool? expand_more
This tool converts in the CSV-to-JSON direction — tabular rows become structured objects. The JSON to CSV tool does the opposite: it takes an existing JSON array and flattens it into CSV rows suitable for importing into spreadsheets such as Excel or Google Sheets.