CSV to JSON Converter

Convert CSV data to JSON instantly in your browser. Auto-detects delimiters, headers, numbers and booleans.

CSV to JSON Converter — Instant Data Transformation Right in Your Browser Stop uploading your spreadsheet exports to random websites just to reshape them. CSV to JSON Converter is a lightweight Chrome extension that turns any CSV data into clean, pretty-printed JSON in under a second — no server, no signup. This csv to json converter works locally, no data leaves your browser — safe even for sensitive datasets. HOW IT WORKS Paste your CSV into the input box and the csv to json conversion happens instantly as you type. The parser fully understands real-world CSV: quoted fields, commas and line breaks inside quotes, escaped double quotes, and both Windows (CRLF) and Unix (LF) line endings. The result appears as pretty-printed JSON with two-space indentation, ready to drop into your code, API request, config file, or documentation. Click Copy JSON to send it to your clipboard or Download .json to save it as a file. KEY FEATURES Instant conversion — the csv to json transformation runs live on every keystroke, fully offline, with no network requests and no latency. Automatic delimiter detection — the extension recognises comma, semicolon, and tab separated data on its own, so European Excel exports with semicolons convert just as easily as classic comma files. A manual selector is there when you want full control over the csv to json output. Header row handling — keep "First row is header" enabled and the csv to json converter produces an array of JSON objects with keys taken from your column names. Disable it and you get a plain array of arrays instead. Smart type detection — with "Detect numbers & booleans" enabled, the value 42 becomes a real JSON number, true and false become booleans, and empty cells become null. Turn it off and every value stays a string, exactly as it appeared in the source. Pretty-printed output — the generated JSON uses consistent two-space indentation, so it is immediately readable and diff-friendly in code review. One-click copy — send the whole csv to json result to your clipboard without selecting text manually. Download as file — save the output as a .json file straight from the popup, no external converter or desktop tool required. Live status line — see exactly how many rows and columns were parsed, or a clear, human-readable error message pointing at the problem row when the input is malformed. Zero permissions — the csv to json converter requests no access to your browsing data, open tabs, history, or any website you visit. WHO IS IT FOR Developers who receive CSV exports from clients and need csv to json test fixtures, seed data, or request payloads in seconds. Data analysts moving spreadsheet extracts into tools and dashboards that only accept JSON. Backend engineers converting lookup tables into configuration files. QA engineers generating structured mock data from tabular sources. Students learning APIs who need realistic JSON from a simple spreadsheet. Anyone who edits data in Excel or Google Sheets but ships it as JSON will use this csv to json converter daily. PRIVACY FIRST CSV to JSON Converter requests zero browser permissions. It cannot inject scripts into web pages, cannot read your browsing history, cannot access your open tabs, and cannot see anything you do outside the extension popup. Every csv to json operation runs inside the popup window using pure JavaScript — the extension works locally, no data leaves your browser, ever. There is no analytics code, no advertisement libraries, and no third-party SDKs. Your data is yours alone. SUPPORTED CSV The parser follows RFC 4180 conventions and handles the messy files real systems produce: fields wrapped in double quotes, commas and semicolons inside quoted values, multi-line cells containing line breaks, escaped quotes written as two double quotes, ragged input detection with precise error reporting, and delimiter variants used by Excel, Google Sheets, LibreOffice, PostgreSQL COPY, and MySQL exports. Whether your file uses commas, semicolons, or tabs, the csv to json engine detects it and converts correctly. GETTING STARTED Pin the CSV to JSON Converter icon to your Chrome toolbar. Click it, paste your CSV, and watch the csv to json output appear instantly. Adjust the options if needed, then copy or download the result. The whole flow takes under five seconds. Install the csv to json converter now and turn every spreadsheet export into clean, structured JSON without leaving your current tab.