Developer tools, no upload

Format, validate and compare structured data

Fast, private tools for JSON, XML, YAML, CSV and SQL. Format, validate, explore and diff structured data in your browser. Nothing is uploaded and nothing is stored.

● Every tool runs in your browser. Nothing you paste leaves your machine.

JSON FormatterPretty-print and validate JSON with precise error positions.JSON ValidatorCheck JSON validity with a plain-English explanation of the error.JSON ViewerBrowse JSON as a collapsible tree with copyable paths.JSON DiffCompare two documents by structure and get a path-level report.XML FormatterPretty-print and validate XML, with real parse errors.SQL FormatterReformat dense SQL into readable, clause-aligned queries.YAML to JSONConvert between YAML and JSON in either direction.CSV to JSONConvert CSV to JSON and back, with correct quote handling.JSON EscapeTurn raw text into a JSON string literal, and back.

Why another set of formatters

The established tools in this category work, but most of them have been gradually buried under advertising. It is normal to find twenty to forty ad slots wrapped around a textarea, with the tool itself pushed below the fold and the page taking most of a second to become usable.

Format Bench is built the other way round. Each page is a single request with its CSS and JavaScript inlined, there are no web fonts and no framework, and there are exactly two ad slots, both placed below the tool. The tool is the first thing on the page and it is interactive immediately.

Everything runs in your browser

No document you paste is uploaded, because there is no server-side processing at all. Every tool here is JavaScript running on your own machine, which you can verify by opening your browser's network panel and watching that nothing is sent.

This is a practical point rather than a philosophical one. Production API responses routinely contain customer records, access tokens and other material covered by a data processing agreement, and pasting that into a hosted formatter is a disclosure. Doing the work locally removes the question.

Accuracy

Parsing uses your browser's own JSON implementation, so a document that validates here will parse identically in Node and in the browser. Where a tool makes a judgement call, such as how arrays are compared or how ambiguous CSV types are inferred, the behaviour is documented on that tool's page and exposed as an option rather than hidden.