Runs entirely in your browser — no uploads, no saved snippets, no public links.

Paste a file, inspect the issues, export reviewed output.

Data repair guides

DataDoctor Guides

Practical tutorials for real data repair tasks: invalid JSON, CSV import failures, duplicate records, schema validation, platform CSV requirements and local-first privacy.

Guide categories

JSON repair and API payloads1

CSV cleanup and quality2

Schema validation1

Platform import readiness4

Local-first privacy1

How to use these guides

Start with the guide that matches the file failure, then open the matching tool from the guide footer.
Use JSON guides for parser, repair and schema issues before sending payloads to APIs.
Use CSV and import guides before editing rows manually or uploading to a platform.
Use privacy guidance before pasting sensitive customer, product or transaction data into any tool.

All guides

Step-by-step repair and import checklists

JSON repair and API payloads

How to Fix Invalid JSON

A practical checklist for finding and repairing invalid JSON before sending it to an API or importing it into a system.

CSV cleanup and quality

Why CSV Import Fails

The most common CSV import failures and how to fix them before uploading the file.

CSV cleanup and quality

How to Remove Duplicate Emails from CSV

Find duplicate email rows, export duplicates and download a clean CSV file.

Schema validation

JSON Schema Validation Explained

A simple explanation of JSON Schema validation for APIs, imports and data pipelines.

Platform import readiness

Shopify Product CSV Pre-Import Checklist

A checklist for validating Shopify product CSV files before import.

Platform import readiness

HubSpot Contact CSV Import Checklist

A practical checklist for checking HubSpot contact CSV files before import.

Platform import readiness

QuickBooks Transaction CSV Import Checklist

Check Date, Description and Amount columns before importing bank transaction CSV files into QuickBooks.

Platform import readiness

WooCommerce Product CSV Import Checklist

Validate WooCommerce product CSV fields, SKUs, prices and image URLs before import.

Local-first privacy

Why Local-First Data Tools Matter

Why private browser-side validation is safer for JSON, CSV and import files.