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Convert CSV data into a JSON array of objects, with smart number and boolean detection.
CSV to JSON is a free browser-based tool that helps you convert csv data into a json array of objects, with smart number and boolean detection. It is part of ToolsMonk's developer tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as turning a spreadsheet export into json for an api or app, converting csv data into a format your code can consume directly, and seeding test data or fixtures from a csv file. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
CSV to JSON is also a strong fit for people searching for csv to json, convert csv to json, and csv json converter, because it combines a simple interface with instant results and privacy-friendly processing.
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
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
CSV to JSON is a powerful free online tool available on ToolsMonk that helps you convert csv data into a json array of objects, with smart number and boolean detection. Whether you're a professional, student, or casual user, our csv to json provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Developer Tools collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
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.
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.
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