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Convert CSV data into a JSON array of objects, with smart number and boolean detection.
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CSV to JSON converts comma-separated data into a clean JSON array of objects, the format most APIs, apps, and scripts actually want to consume. The first row becomes the keys, and each subsequent row becomes a typed object.
The quality of a CSV converter lives in its parser, and this one uses a proper RFC 4180 approach: quoted fields may contain commas and newlines, and doubled quotes inside a field are read as a literal quote. That's exactly where naive split-on-comma tools fall apart, producing broken or misaligned output, this handles those cases correctly.
It also types your data. Numeric cells become JSON numbers and true/false become booleans, so you get properly-typed JSON rather than strings everywhere. The one thing to watch is that identifier-like values (ZIP codes, phone numbers, leading-zero IDs) are detected as numbers, so protect those upstream if you need them kept as text.
Everything runs in your browser, so your CSV, often containing private records, is never uploaded. Pair it with the JSON to CSV tool to convert in the other direction, and the other ToolsMonk developer utilities for the rest of your data work.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Developer Tools |
Paste your CSV (the first row should be the column headers)
Click Process
Each row becomes a JSON object keyed by the headers, with numbers and booleans typed
Copy the JSON array for your code or API
Converts CSV into a clean JSON array of objects
Proper RFC 4180 parsing, handles quoted fields, escaped quotes, and commas/newlines inside values
Auto-detects numbers and booleans so the JSON is typed, not all strings
Uses the first row as keys for each object
Runs entirely in your browser, your data is never uploaded
Free, with no signup and no rate limit
Turning a spreadsheet export into JSON for an API or app
Converting CSV data into a format your code can consume directly
Seeding test data or fixtures from a CSV file
Inspecting CSV as structured JSON during development
Ensure the first row contains your column headers, they become the JSON keys
If an ID or ZIP code should stay text, remember it'll be auto-detected as a number; quote-protect it upstream if needed
Use the JSON to CSV tool to convert back the other way
Common questions about this tool, its workflow, and what to expect before you use it.
IETF
Defines quoting, escaped quotes and line breaks inside CSV fields.
IETF
Defines valid JSON, which is what the validator checks your input against.
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