ToolsViewer's JSON Formatter & Converter is a free json formatter, JSON validator, editor, viewer, sorter, and multi-format converter: pretty-print or minify JSON, stringify / parse escaped strings, compare two documents, browse a tree outline, flatten paths, convert to XML / CSV / TSV / YAML, import from a URL, and download the result — in your browser, with no signup.
Use it when an API response looks like one line, when JSON.parse fails, or when you need a quick path from a Python dict to JSON or from JSON to TypeScript, C#, Java, XML, or CSV. For HTML markup use HTML Viewer Pro; for patterns use RegEx Visualizer.
Paste or import data, then format, validate, or convert.
Drop in JSON, a Python dict, a JS object literal, JSON Lines, CSV, XML, or a query string. Use Import URL for public http(s) endpoints that allow CORS.
Pretty-print with your indent, compress whitespace, or validate and jump to line/column errors. Check the size calculator for pretty vs minified bytes.
Export JSON → XML, CSV, TSV, YAML, or an escaped string; open Compare for a structural diff; use Tree for an outline; or Flatten paths. Then copy or download the file.
Debug APIs, convert formats, and tidy payloads without an IDE.
Pretty-print messy API responses, catch syntax errors with line/column hints, and minify when you need a one-line payload.
Turn Python dicts, CSV, XML, or JSONL into JSON — or export to XML, CSV, TSV, YAML, and language helpers. Compare two documents with a structural diff.
Formatting, validation, and conversion run in your browser. Import from URL fetches directly from your device to that host. See the Privacy Policy.
Pretty-print and minify, validate with line/column errors, stringify / parse escaped strings, sort keys, compare documents, browse a tree outline, flatten paths, convert to XML / CSV / TSV / YAML, import from URL, and download the result. Students, developers, and data folks get a private JSON workspace — without installing an IDE or signing up.
Prefer a walkthrough? Open the JSON Formatter guide or browse the JSON Formatter blog — including JSON formatter online, validate JSON online, convert JSON to XML, and Python dict to JSON. Related apps live on the Tools Viewer homepage.
A JSON formatter pretty-prints JSON with indentation and clear structure so you can read and debug it. ToolsViewer’s JSON Formatter & Converter also validates syntax, minifies, converts from other formats, and lets you download the result — all in your browser.
Yes. JSON Formatter & Converter on Tools Viewer is free with no signup. Format, validate, convert, import from URL, and download in your browser.
Yes. Paste a Python dict or list (True/False/None and single quotes supported as a best-effort conversion), choose Python as the input format or leave Auto-detect on, then convert to JSON, TypeScript, C#, Java, XML, CSV, and more.
Yes. Invalid JSON shows a clear error message with line and column when the browser reports a position, so you can fix trailing commas, quotes, and other syntax issues quickly.
Yes. Use Minify to remove unnecessary whitespace. The size panel compares pretty-printed vs minified byte sizes so you can see how much space you save.
Yes. Use Import URL to fetch a public http(s) JSON (or text) resource in your browser. The remote host must allow CORS; private or blocked APIs will fail in the browser for security reasons.
Yes. After formatting or converting, use Download to save a file locally (JSON or the selected output format such as .csv, .xml, .ts, or .cs).
Formatting, validation, and conversion run in your browser. Import from URL fetches the remote resource directly from your browser to that URL — Tools Viewer does not proxy or store that content on our servers.
Yes. Convert mode exports JSON to XML, CSV, TSV, YAML, an escaped JSON string, plain text, plus TypeScript, C#, Java, Lua, JS, and Python helpers. Generators are best-effort for common structures.
Yes. Open Compare mode, paste JSON A on the left and JSON B on the right, then run Compare for a structural path-level diff (added, removed, and changed values).
Yes. Use Stringify for an escaped JSON string, or Convert → JSON string. Parse string unwraps a quoted escaped payload back into structured JSON.
Yes. Open the Tree tab on the results panel to browse a collapsible outline of objects and arrays alongside the editor.
Yes. Paste JSON Lines and convert them into a JSON array, then format, minify, or export to another format.
Yes. The size panel shows characters, UTF-8 bytes, pretty vs minified size, key count, depth, and null counts for the current document.
No. Open JSON Formatter & Converter in any modern browser, paste or import your data, and work privately on your device.
