Convert Large CSV to JSON

Allow your customers to upload large CSV / Excel files with up to 500,000 rows. You get ready to use JSON data in your web app, SaaS, database or API.

Large CSVs

Convert upto 500MB large CSV having 500,000 rows and 100 columns without breaking a sweat.

Fast and Easy

Simply specify the column mappings and data destination. The importer will transform CSV data into JSON and sent it over.

Robust & Fault Tolerant

The importer processes large CSVs files incrementally to ensure no browser locking or memory errors.

Large CSV to JSON Convertor

Use CSVbox drop-in widget to collect CSVs of any size from your customers and convert them into clean data that your systems can understand. Here is how it works.

Define CSV Schema

Define your data model and configure the validation rules with just a few clicks.

Configure data destination

Configure Webhook as your data destination and JSON as the data format. Add the importer JS snippet in your app and start accepting files.

Users Map Columns

With a simple file picker, the users select a spreadsheet that needs to be uploaded. They then match the file column headers to the predefined data model.

Validate Data

Before submitting the file, the users can fix validation issues right inside the upload widget. This ensures that the uploaded data is clean and ready to use.

Receive JSON

Users submit the spreadsheet and monitor the upload. You receive ready-to-use JSON data in your web app, API, or third-party service that you configure.


At the end of an import, csvbox will return a JSON object. It doesn't matter if your backend is Ruby, C#, Python, Node.js, PHP or anything else you could be using. We will give you clean data as JSON and a way to send it to your server. Your server will take it from there.

CSV to JSON Python

CSV to JSON Node.js

CSV to JSON Ruby



CSV to JSON Ruby

...or any major Javascript framework

CSV to JSON Javascript

CSV to JSON React

CSV to JSON Angular

The CSV to JSON Importer for SaaS

Way more than a file uploader - a complete import service.

Multiple File Types

Accept csv, xlsx and xls - the most common spreadsheet formats.

Column Matching

Let users match the columns of their files with the required data model schema.

Data Validation

Client side validation based on predefined sheet rules allows users to self clean data before upload.

Sleek UX

The simplistic widget UI makes a file upload painless and intuitive.

Progress Bar Uploads

Give your users confidence that their files are on the way to the right destination.

No Code Config

Configure the data model and validation options via dashboard with no change in installed code.


Push CSV data directly to your app via API. More destinations coming soon.

Import Links

Share special links to accept files without the need to embed the widget.

Custom Attributes

Attach custom fields such as user_id to the incoming data to identify the users.

Event Hooks

Setup webhook listeners to receive alerts about widget events such as import complete.

Data Security

End to end encryption for user data in transit as well as at rest.


GDPR ready with built-in product features for greater privacy and data control.

Ready to get started?

Contact us or sign up now.