WebUtilsLab Data Tools

Free Local-First Data Tools

Convert, validate, compare, and reshape structured data without sending pasted input to a server. Built for API debugging, data imports, config cleanup, QA checks, and developer handoffs.

Data tools

Data

CSV to JSON Converter

Paste or import CSV, preview rows, infer values, and copy JSON Array or JSON Lines output locally.

Row preview and type inference
JSON Array or JSON Lines

Open CSV to JSON

Data

JSON Formatter / Validator

Format, validate, minify, sort, and inspect JSON locally with copy-ready output and parser errors.

Format, validate, and minify
Sort keys and inspect JSON type

Open JSON Formatter

Data

JSON Diff / Compare Tool

Compare two JSON values locally and review added, removed, changed, and unchanged fields by path.

Recursive JSON diff table
Copy-ready structured summary

Open JSON Diff

Data

JSON to CSV Converter

Convert JSON arrays or objects to CSV locally with nested flattening, delimiter options, copy, and download.

Flatten nested JSON fields
Copy or download CSV output

Open JSON to CSV

Data

YAML to JSON Converter

Convert YAML config files and snippets to formatted or minified JSON locally in your browser.

YAML to formatted or minified JSON
Multi-document YAML support

Open YAML to JSON

Data

JSON to YAML Converter

Convert JSON into readable YAML locally with indentation, key sorting, and copy-ready output.

Strict JSON to readable YAML
Indentation and key sorting options

Open JSON to YAML

Data

XML Formatter / Validator

Format, validate, minify, and inspect XML locally with parser errors and copy-ready output.

Format, validate, and minify XML
Root element and path summary

Open XML Formatter

Recommended data workflow

Best starting tool: JSON Formatter / Validator — Use it first when you already have JSON from an API response, fixture, log, or config file.

Common workflow path: CSV to JSON JSON Formatter JSON Diff JSON to CSV

Common problem solved: Clean messy structured data, validate the shape, compare changes, then hand off copy-ready output to an API client, spreadsheet, test fixture, or config file.

Start with CSV to JSON or YAML to JSON when you receive source data from a file or config.
Clean and inspect the result with JSON Formatter, then compare versions with JSON Diff.
Send the normalized output to JSON to CSV, JSON to YAML, or XML Formatter when another system needs a different shape.

Related categories

Move between related WebUtilsLab tool categories when a task crosses formats, encoding, scheduling, or implementation checks.

Encoding Developer Utilities Time

When to use these Data tools

API response cleanup

Format or compare JSON payloads before pasting them into tests, tickets, API clients, fixtures, or documentation.

Spreadsheet handoff

Move CSV exports into JSON, JSON Lines, or flattened CSV when a teammate or system needs a different data shape.

Config conversion

Convert YAML, JSON, and XML snippets while preserving enough structure to review values before copying output.

Data tools FAQ

Do these data tools upload my files?

No. Pasted text and imported files are processed in the browser page. WebUtilsLab does not save the content you convert.

Which data tool should I start with?

Start with the format you already have: CSV to JSON for spreadsheets, JSON Formatter for API responses, YAML to JSON for config, and XML Formatter for feeds or markup.

Can I use these tools for sensitive API payloads?

The tools are local-first and do not intentionally upload your input. For highly sensitive production secrets, still prefer your own audited local environment.