Local-first data preflight
Catch broken imports while the file is still on your machine.
DataDoctor turns CSV, JSON and schema failures into a readable browser-side preflight report before Shopify, HubSpot, WooCommerce, QuickBooks, a database or an API sees the file.
No upload required
No saved snippets
No account needed
Sample input
customers.csvemail,name,plan,created_at,amount ada@example.com,Ada Lovelace,pro,2026-01-02,199 grace@example.com,Grace Hopper,enterprise,2026-01-03,499 ada@example.com,Ada Lovelace,pro,2026-01-02,199 bad-email,Missing Email,free,not-a-date,10 ,No Email,free,2026-01-05,0
Import readiness report
Needs review
3
Critical
2
Warnings
8
Passed
- Duplicate customer row detected for ada@example.com
- Row 5 has invalid email format
- created_at contains an invalid date value
Next action
Fix the duplicate and invalid rows first, export a reviewed file, then run the same preflight again before the importer sees it.
25
Browser tools
JSON, CSV, schema and platform preflight tools.
9
Repair guides
Human-readable checklists for imports and payload fixes.
0
Uploaded snippets
The free tools keep pasted data in the current browser session.
4
Workflow lanes
Choose by JSON, CSV, schema or destination platform.
How the workflow runs
Pick the failure mode first. The correct first check saves cleanup work later.
CSV imports fail for different reasons than API payloads or schema contracts. DataDoctor is strongest when the first tool matches the actual blocker instead of the file extension alone.
Step 1
Choose the failure mode
Start from parser errors, duplicate keys, required fields or platform-specific import warnings.
Step 2
Run a browser preflight
Paste data, load a sample or upload a local file. The tool turns raw failures into a readable report.
Step 3
Repair and re-check
Export the reviewed output, fix the real blocker and re-run the same preflight before the destination system sees it.
Choose your lane
Start from the job you need to finish.
CSV import readiness
Validate structure, profile missing values, dedupe rows and prepare a clean reviewed export before upload.
Open laneJSON payload repair
Repair malformed JSON, inspect nested payloads, format output and convert clean records downstream.
Open laneSchema contract checks
Generate starter schemas, validate data against explicit contracts and turn raw validation errors into fix steps.
Open lanePlatform import checkers
Run Shopify, WooCommerce, HubSpot, Mailchimp, Google Contacts or QuickBooks-specific preflight checks first.
Open laneRepresentative outcomes
Reports stay specific to the downstream risk.
Generic validation is not enough when the destination has real business rules. Product imports, contact lists and API payloads each need a different first-pass report and a different next action.
Example report
Shopify product CSV
Duplicate handles, invalid variant prices and missing option values surface before product import.
Best fit: Good when you need product-specific blocking rules first.
Example report
HubSpot contacts CSV
Email identity, invalid values and duplicate contacts stay visible before the CRM creates bad records.
Best fit: Good when the destination depends on email as contact identity.
Example report
JSON API payload
Syntax failures, repair candidates and schema next steps show up in one pass before the API rejects the body.
Best fit: Good when a payload is pasted from logs, docs or generated output.
Local-first promise
The free workflow stays useful because it does not turn public tools into a data store.
CSV parsing, JSON validation, schema checks and report generation happen in the current browser session.
The free tools avoid saved snippets, public share links and account-gated uploads.
Import-specific tools stay honest about the limit: local preflight first, destination acceptance second.