Is my code or data sent to a server?

No. Parsing, formatting and comparing all run in your browser, so you can paste API responses, configuration and logs with tokens or customer data in them without anything leaving the page.

What happens when the input is invalid?

You are told where the problem is rather than handed a guess: the JSON formatter gives the line and column of the first error, and the YAML validator names the line it could not read and shows the lines around it.

Why do some cards lead to another site?

The plain file conversions, such as CSV to JSON and JSON to YAML, are on Nouplo’s converter site. The cards say where they lead.

Yes, with no account and nothing to install.

Formatters and validators

The developer tools on Nouplo for reading, checking and reshaping code and data: formatters and minifiers, validators, diffs and testers, and conversions between JSON, XML, CSV, YAML, SQL and Markdown. Everything runs in your browser, so pasted data stays on your machine.

Format and minify
Validate, compare and test
Convert data

Format and minify

{} JSON Formatter Paste JSON, get it indented, minified or validated instantly. Your data stays on this page. ‹› XML formatter Indented to be read, or squeezed to one line to be sent. ⌗ SQL formatter A query you can read, from one you were handed. ‹› HTML formatter Indented so you can read it, or squeezed so you can ship it. ◒ CSS formatter One declaration to a line, or the whole file on one. • JavaScript minifier Smaller, and provably the same code.

Validate, compare and test

✓ YAML validator Does it parse — and does it mean what you think? ≠ JSON diff What actually changed, as a path. {} JSONPath evaluator The path, your document, and what it actually selects. • Regex Tester Type a pattern, paste some text, and see every match and capture group as you go.

Convert data

⇄ XML to JSON With the rules stated, so nothing surprises you. {} JSON to types A sample in, a type out. ⌗ CSV to SQL A pasted table, ready to run. ▦ Markdown table Paste a spreadsheet, get a table that lines up. ⇄ Converters CSV to JSON Turn spreadsheet exports into JSON for APIs, scripts and config files, without your data leaving the page. ⇄ Converters JSON to CSV Turn API responses and exports into a spreadsheet-ready CSV without your data leaving the page. ⇄ Converters JSON to YAML Paste JSON, get YAML. It runs in this page, not on a server. ⇄ Converters YAML to JSON Paste YAML, get JSON. Nothing is uploaded, and nothing is guessed at. ⇄ Converters Markdown to HTML Write in Markdown, paste the HTML anywhere. Rendered locally, so your draft stays on your device.

Frequently asked questions

Is my code or data sent to a server?: No. Parsing, formatting and comparing all run in your browser, so you can paste API responses, configuration and logs with tokens or customer data in them without anything leaving the page.
What happens when the input is invalid?: You are told where the problem is rather than handed a guess: the JSON formatter gives the line and column of the first error, and the YAML validator names the line it could not read and shows the lines around it.
Why do some cards lead to another site?: The plain file conversions, such as CSV to JSON and JSON to YAML, are on Nouplo’s converter site. The cards say where they lead.
Is it free?: Yes, with no account and nothing to install.