CSV to JSON Converter

CSV to JSON Converter — fast, private, and built for messy real‑world data

Spreadsheets and exports usually land in CSV, while your API, app, or script wants JSON. This converter removes the tedious part of that handoff. Paste your CSV into the editor or click Upload CSV to add a file, and you’ll get an instant JSON preview on the right. It’s ideal for developers preparing fixtures, analysts shaping data for a dashboard, or anyone who needs a reliable CSV to JSON pipeline without installing heavy software.

The tool is designed for real‑world files, not perfect demos. It can auto‑detect your delimiter or you can set it yourself (comma, tab, semicolon, or pipe). If your file uses the first line as headers, keep First row is header enabled to produce named keys. Prefer plain arrays? Disable the header toggle and you’ll get a neat, position‑based structure.

A frequent pain point in conversion is type fidelity. CSV is all text, but your app likely expects numbers and booleans to be actual types. Turn on Infer data types and values like 42 and true become native JSON numbers and booleans instead of strings. If you’re moving data into a system that insists on strings everywhere, you can simply switch that option off to preserve everything verbatim.

Output shape matters, so you can choose what best fits your downstream workflow. Use Array of Objects for most API‑style payloads (each row becomes an object keyed by header names). If you’re optimizing for a tiny footprint or don’t need headers, Array of Arrays yields a compact structure. For lookups, try Object of Objects, which uses the first column as keys—great for config maps or quick in‑memory indexing (just make sure that first column is unique).

When you’re done, decide how you want to ship the result. Keep it readable with standard indentation, or toggle Minify for a compact output that’s ideal for production or inline embedding. Use the copy button to grab the result instantly, or click download to save a .json file.

Your data stays on your device. This page performs all parsing and conversion in your browser—no uploads, no external processing, and no tracking. That makes it a safe choice for prototypes, internal datasets, or anything sensitive. If you ever need the reverse direction, jump to JSON to CSV. To validate and pretty‑print output—or to inspect a payload you received—use the JSON Formatter. If your CSV came from a messy source, the Text Cleaner can fix stray whitespace and unexpected symbols before you convert. For quick pattern edits, Find & Replace is handy as well.

Key features

• Paste or upload CSV; instant JSON preview
• Auto-detect or choose delimiter (comma, tab, semicolon, pipe)
• Header row toggle and inferred data types
• Three output shapes: Array of Objects, Array of Arrays, Object of Objects
• Minify option for compact JSON
• One-click copy and .json download
• 100% client-side; no data uploads

Practical tips

• If the preview looks off, set the delimiter explicitly.
• Disable “First row is header” when your CSV doesn’t include headers.
• Use “Object of Objects” only when the first column contains unique IDs.
• Turn off Infer data types if you need everything preserved as strings.

Frequently asked questions

Whether you’re seeding a database, building an integration test, or moving a spreadsheet into an app, this CSV to JSON converter keeps the process quick, predictable, and private—all without leaving your browser.