Configure schemas in your codebase and get back clean, typed records your app can use.
Start validating rows immediately in the browser, without waiting for full-file uploads or server-side preprocessing.
Time until first validated record reaches your API
Make the importer feel native to your app with theme tokens, custom copy, and CSS when you need exact control.
Define imports in code, review changes in PRs, and use the same helpers, permissions and context your app already relies on.
import { x } from '@expresscsv/react'; import { getEmailDomain } from '@/lib/users'; const usersImporter = x.row({+ email: x.string().email().refine((email) => {+ const domain = getEmailDomain(email);+ const allowed = workspace.allowedDomains.has(domain);+ return { valid: allowed, message: 'Domain not allowed for workspace' };+ }),+ role: x.select(['admin', 'member']), name: x.string(), });Optional AI automations can help match messy column names and clean values. You control when they’re enabled and what data is shared.
Define your schema once and get typed imported rows back in your app, with no duplicate type definitions.
const usersSchema = x.row({email: x.string().email(),role: x.select(['admin', 'member']),});open({onData: (chunk, next) => {chunk.records[0].},});Private by design
ExpressCSV validates files client-side, then hands validated records to your frontend. The raw data never touches our servers.
Use our ready-made prompt to wire up the SDK with your app in around 20 minutes.
We'd looked at other tools but ExpressCSV felt like the modern and code-first option. Up and running in ~20 minutes and replaced our custom importer, we've never looked back.
Nick Taylor
CTO, Weldmet
We deal with sensitive customer data, so the fact that imports run entirely in the browser and never hit ExpressCSV's servers was a huge deal for us. Security review was basically a non-event.
Gonzalo Correa
Engineer, Switch
Start small, upgrade when import volume grows.
For building and testing imports
For your first customer-facing import flow
For growing businesses
For high-volume import workflows
Give users a polished, browser-side import flow and get clean, typed records back in your app.