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Pretty-print minified JSON with 2-space indentation and syntax highlighting. Use when readable JSON is needed; for minifying use json-minifier, for full validate+format workflow use json-formatter. Input: JSON text ≤10MB. Returns formatted JSON or line-numbered error. 100% client-side.
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Beautifies JSON with 5 syntax themes for the output, configurable indentation, key sorting, bracket padding, and quote style (double vs single). Handles trailing commas gracefully, supports JS object literal and JSONP output formats, and includes a side-by-side diff view between original and beautified JSON.
Raw minified JSON from APIs or config files is unreadable, and different projects use different formatting conventions. This tool not only pretty-prints JSON but also transforms it between formats (JS object, JSONP) and themes it for readability.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
API developers inspecting JSON responses, configuration file maintainers, and teams enforcing consistent JSON formatting across projects.
Paste raw JSON into the input area or upload a .json file
Select a theme from 5 options (e.g., light, dark, monokai, github, solarized)
Set indent size (2, 4 spaces or tabs), toggle bracket padding, and choose quote style (double or single)
Enable sort keys to alphabetically order all JSON keys
Select output format: JSON, JS Object Literal, or JSONP (with callback name input)
Toggle trailing commas on or off; use side-by-side view to compare original vs output
Input: '{"z":1,"a":2}' with sort keys and 2-space indent. Output: '{\n "a": 2,\n "z": 1\n}'Input: '{name:"test"}' with JS Object Literal mode. Output: '{name: "test"}' (unquoted keys if valid identifiers).What are the 5 themes?
Light, Dark, Monokai, GitHub, and Solarized (both light and dark variants).
Does it validate JSON before formatting?
Yes, invalid JSON is flagged with a parse error message.
Can I convert JSON to YAML?
No, this tool focuses on JSON and JS object formats.
What is JSONP output?
It wraps the JSON in a callback function: callbackName({"key":"value"})
Authoritative specifications, standards, and in-depth reading for JSON Beautifier.
Free online JSON formatter and validator with syntax highlighting and error line numbers. Use as default for beautify+validate+minify in one place; for two-file comparison use json-diff, for schema generation use json-schema-generator. Input: JSON ≤10MB. Returns formatted JSON or line-numbered error. 100% private.
Compress JSON by stripping whitespace for smallest payload. Use when preparing production payloads; for readable output use json-formatter or json-beautifier. Input: JSON text ≤10MB. Returns minified JSON or line-numbered error. 100% client-side.
Compare two JSON documents and highlight added, removed, and changed keys with line-level diff. Use when comparing API responses or configs; for single-document formatting use json-formatter, for validation errors use json-validator. Input: two JSON texts ≤10MB. Returns highlighted diff. 100% client-side.
Validate JSON syntax and report errors with line numbers without reformatting. Use when only correctness matters; for auto-fix and formatting use json-formatter. Input: JSON text ≤10MB. Returns valid/invalid + error location. 100% client-side.
Escape or unescape JSON strings. Use when embedding JSON; for formatting use json-formatter. Input: JSON ≤10MB. Returns escaped string. 100% client-side, files never leave browser.
Minify JS for production or beautify minified JS for debugging. Use for JS only; for JSON use json-formatter, for CSS use css-formatter. Input: JS text ≤10MB. Returns minified or beautified JS or syntax error. 100% client-side.
Format and validate HTML with indentation and error reporting. Use as default HTML tool; for minifying production HTML use html-minifier, for converting HTML to Markdown use html-to-markdown. Input: HTML ≤10MB. Returns formatted HTML or validation errors. 100% client-side.
Format or minify CSS with indentation control. Use as default CSS tool handling both directions; css-minifier URL is a noindex alias. Input: CSS ≤10MB. Returns formatted or minified CSS. 100% client-side.