JSON tools that run in your browser

JSON is the interchange format of the web — API payloads, config files, log lines, database exports. These eight tools cover the everyday JSON jobs: pretty-print and validate a document with exact error positions, strip it down to its smallest form, diff two documents structurally, query with JSONPath, generate TypeScript interfaces, or convert it to YAML for a Kubernetes manifest, to CSV for a spreadsheet and to XML for legacy systems.

Every tool parses per RFC 8259 and runs entirely in your browser tab, so pasting a production API response or a customer data export here is safe: the document is never transmitted, logged or stored on a server.

All 8 JSON tools

JSON Formatter & ValidatorPretty-print, minify and validate JSON in your browser.JSON MinifierStrip whitespace from JSON and see the bytes saved.JSON ↔ YAML ConverterConvert JSON to YAML and back for configs and manifests.JSON ↔ CSV ConverterTurn arrays of objects into CSV rows and back again.JSON DiffCompare two JSON documents structurally, ignoring key order.JSON ↔ XML ConverterConvert JSON to XML and back, and pretty-print XML.JSON → TypeScriptGenerate TypeScript interfaces from a JSON sample.JSONPath TesterQuery JSON with JSONPath and inspect every match.

Jump straight to a job

Guides

How to pretty-print JSONPaste JSON into the formatter and press Format — 2-space indents, exact error positions — or use jq in the terminal. The file never leaves your tab.
How to fix “Unexpected token” in JSONUnexpected token means the parser hit illegal syntax: a trailing comma, single quotes, comments or an HTML error page. Find the exact line locally.
JSON vs YAML vs CSV: which format for which job?JSON for APIs and precision, YAML for human-edited configs, CSV for tabular exports — how data model, comments and types decide, with converters.

Looking for something else? Browse thefull tool directoryor readhow the local-only processing works.