What is CSV to JSON?

CSV to JSON is a browser-based tool for converting CSV data into JSON. It lets you inspect spreadsheet exports and database dumps as structured JSON, which is useful when reviewing data before sending it to an API or reusing it in an application.

It supports comma, tab, and custom delimiters, and you can switch between formatted and compact JSON output. Everything runs in the browser, so you can review the data locally while converting it.

How to Use CSV to JSON

1. Paste your CSV data into the input area on the left.
2. Choose the delimiter. If needed, enter a custom delimiter.
3. Turn JSON formatting on or off.
4. Review the converted result in the panel on the right, then copy it if needed.

The output updates in real time as you change the input or settings. If the CSV is malformed, the tool switches to an error state instead of showing JSON.

Main Settings

Delimiter

This setting controls which character is used to split columns in the CSV. For standard CSV files, a comma is usually enough. If you are working with tab-separated data or files that use a custom separator such as a semicolon, change the delimiter before converting.

Custom delimiters are useful when the pasted data does not split into columns correctly. If the output looks wrong, checking the delimiter is usually the first thing to try.

Format JSON

This setting switches between readable formatted JSON and compact one-line JSON.

• On: Adds indentation and line breaks so the output is easier to inspect
• Off: Returns compact JSON that is easier to copy and paste as-is

Use formatted output when you want to inspect the structure, and compact output when you just need the JSON string quickly.

CSV Format Example

id,name,age
1,John Doe,25
2,Jane Smith,30
3,Robert Johnson,28

JSON Result Example

[
  {
    "id": "1",
    "name": "John Doe",
    "age": "25"
  },
  {
    "id": "2",
    "name": "Jane Smith",
    "age": "30"
  },
  {
    "id": "3",
    "name": "Robert Johnson",
    "age": "28"
  }
]

In this tool, every CSV value is converted to a string in JSON. For example, 25 is output as "25", not as a numeric value.

Use Cases

• Checking spreadsheet exports or CSV dumps as JSON arrays
• Reviewing column names and values before sending data to an API
• Inspecting tab-separated or custom-delimited text as structured data
• Creating quick JSON sample data during development

Things to Keep in Mind

• The first row is treated as the header row and becomes the JSON keys
• Values are not automatically converted to numbers or booleans
• Broken quotes or mismatched columns can cause the conversion to fail
• Empty lines are skipped during parsing

If the CSV is invalid, the tool will show an error instead of JSON. Common causes include misaligned columns, unclosed quotes, or using a different delimiter than expected.

Technical Information

This tool runs entirely in the browser. The CSV data you paste is not sent to a server, which makes it convenient when you want to inspect or convert data locally.