CSV to JSON Converter
Convert CSV to JSON instantly with our free online tool.
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How to Convert CSV to JSON
Paste your CSV data with headers in the first row. Click Convert and each row becomes a JSON object with header names as keys.
What is CSV?
CSV is a simple text format for tabular data. Each line represents a row, with values separated by commas. It's the standard export format for spreadsheets and databases.
What is JSON?
JSON is a structured data format ideal for APIs and programming. Converting CSV to JSON makes spreadsheet data easy to use in web applications.
Common Use Cases
Convert CSV to JSON when importing spreadsheet data into web apps, processing exported database data, or preparing data for REST APIs.
Convert CSV to JSON in Code
When the conversion needs to run in a script or pipeline:
Python (pandas)
import pandas as pd
pd.read_csv("data.csv").to_json("data.json", orient="records", indent=2)Python (stdlib)
import csv, json
with open("data.csv") as f:
print(json.dumps(list(csv.DictReader(f)), indent=2))Node.js
const [header, ...lines] = require("fs").readFileSync("data.csv", "utf8").trim().split("\n");
const keys = header.split(",");
const json = lines.map(l => Object.fromEntries(l.split(",").map((v, i) => [keys[i], v])));Frequently Asked Questions
Does the first row need to be headers?
Yes, by default the first row is treated as column headers which become the JSON object keys.
What delimiter formats are supported?
The converter auto-detects common delimiters including comma, semicolon, and tab characters.
How are empty values handled?
Empty values are converted to empty strings in the JSON output. You can optionally treat them as null.
Can I convert TSV (tab-separated) files?
Yes, the converter automatically detects tab-separated values and processes them correctly.