Convert CSV to JSON
Quickly convert a CSV file to a JSON data structure. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Convert CSV to JSON
- 1. Paste your CSV. Drop the comma-separated rows into the input pane. An export from Excel, a database dump or a hand-typed table all work; the converter reads it as you type and shows the JSON on the right.
- 2. Tell it about the header. Enable First row is header to use the first line as property names, producing an array of objects. Leave it off and each row becomes a plain array of values instead.
- 3. Choose how values are typed. Turn on Parse numbers and booleans so 36 becomes a number and true becomes a boolean rather than strings. Pick your Indent (2 spaces, 4 spaces or Tabs) to match the codebase you are pasting into.
- 4. Copy the JSON. Hit the copy button on the output pane and drop the array into your fixture file, API mock or script. Edits to the CSV re-run the conversion instantly.
When to use Convert CSV to JSON
Convert CSV to JSON bridges the gap between spreadsheet exports and code. Analysts hand you data as CSV, but your frontend, tests and APIs all speak JSON. This tool turns rows into an array of objects keyed by the header, so you skip writing a one-off parsing script for every file.
- Seeding test fixtures. A product manager sends a CSV of sample accounts for QA. Convert it with the header option on, paste the object array into a fixtures.json file, and your jest suite can import it directly.
- Feeding a frontend prototype. You are mocking a dashboard before the API exists. Turn the spreadsheet the client shared into JSON, save it next to the component, and fetch it locally while the backend team catches up.
- Loading data into a NoSQL store. MongoDB and Firestore import tools want JSON documents, not rows. Convert the CSV with number parsing enabled so ages and prices arrive as real numbers instead of quoted strings.
- Inspecting a machine-learning dataset. A Kaggle-style CSV is hard to skim when columns drift apart. As JSON objects, every value sits next to its field name, which makes spot-checking a few records much faster.
Examples
Convert a spreadsheet with a header row
Input
name,age Ada,36 Grace,45
Output
[
{
"name": "Ada",
"age": 36
},
{
"name": "Grace",
"age": 45
}
]About the Convert CSV to JSON tool
Convert CSV to JSON does its work locally, right in the browser. Quickly convert a CSV file to a JSON data structure. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the CSV Tools collection on EditSafely, a set of 133 small, focused CSV utilities that share the same instant, private workspace.
You can shape the output with 3 settings, including First row is header, Parse numbers and booleans and Indent, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Convert CSV to JSON cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.