Code Formatters & Converters - Prettier, Markdown, CSV Online

Format JSON, XML, YAML, CSV — and convert between them

Pretty‑print messy JSON responses, validate XML payloads, format YAML configurations, beautify SQL queries, and convert between data formats — all in one tool that runs entirely in your browser. From a one‑line API response to a thousand‑line configuration, this is the fastest way to make data readable.

Every developer wastes time daily wrestling with minified or malformed data. Whether you're inspecting a webhook payload, debugging a config file, preparing a CSV import, or transforming JSON into YAML for a Kubernetes manifest, a fast in‑browser formatter is essential infrastructure.

Because it works locally, you can paste real production data — customer records, API tokens, internal payloads — without worrying about data leaks. The tool also flags syntax errors with line numbers so you can fix malformed input before sending it onwards.

Why use Formatters & Converters?

Format and validate

Pretty‑print structured data and catch syntax errors instantly.

Convert between formats

JSON ↔ YAML ↔ XML ↔ CSV with a single click.

100% private

Production payloads, secrets and customer data never leave your browser.

Built for big payloads

Handles megabyte‑scale documents without freezing.

How to use Formatters & Converters

1
Paste your data
Drop JSON, XML, YAML, CSV or SQL into the input editor.
2
Pick an operation
Choose to format, validate, minify, or convert into another format.
3
Inspect the output
See clean, indented results with line numbers and syntax highlighting.
4
Copy or download
Grab the formatted result for use in code, configs, or documentation.

Common use cases

Pretty‑print API responses

Make minified production responses readable for debugging and documentation.

Validate config files

Check YAML or JSON configs for syntax errors before deploying.

Migrate between formats

Convert legacy XML to JSON, or transform a JSON config into YAML for a new platform.

Prepare CSV imports

Format and clean CSV data before importing into spreadsheets or databases.

Features at a glance

JSON, XML, YAML, CSV, SQL formatting
Format ↔ minify
Cross‑format conversion
Inline syntax error reporting
Line numbers and indentation control
Drag‑and‑drop file support
Dark mode editor
100% client‑side privacy

Frequently asked questions

How do I format JavaScript code online?

Paste your JavaScript code into our Prettier formatter tab and click Format. The code is reformatted with consistent spacing, line breaks, and indentation.

Can I convert CSV to JSON online for free?

Yes. Our CSV to JSON tab accepts CSV with headers and converts it to a properly structured JSON array. Preview and copy the result instantly.

What languages does the online code formatter support?

Our Prettier-powered formatter supports JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and more languages with standard formatting rules.

Is there a Markdown editor with live preview?

Yes. Our Markdown tab includes a split-pane editor with live HTML preview as you type, plus toolbar shortcuts for common formatting.

Your privacy matters

Formatters & Converters runs entirely in your web browser. Your files, text, and data are never uploaded to any server, never stored, and never seen by us or any third party. This client-side architecture means you can safely process confidential business documents, personal records, and proprietary data without privacy concerns.

Formatters & Converters