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Format JSON online with pretty print (indent 0–8, default 2), one-click minify, syntax validation, and optional recursive key sorting. Side-by-side input and output, parser error messages, and character/line stats — all in your browser.
Also try the Regex Generator, API Key Generator, and more in Utility tools.
Last updated: May 19, 2026 · Published: 2026-04-09 · Updated: 2026-05-19
Output stats
Characters: 113
Lines: 6
A JSON formatter helps developers read and ship structured data. You paste raw or minified JSON, parse it safely, then re-serialize with spacing for humans or without spacing for compact APIs. Muxgen adds validate-only mode and optional key sorting for cleaner git diffs.
Everything runs client-side with JSON.parse and JSON.stringify — no upload to Muxgen servers and no account required.
Three steps to clean, valid JSON.
Use the Input JSON textarea — sample data loads by default; replace with API responses or config files.
Indent spaces 0–8 (default 2); optionally enable Sort object keys before format or minify.
Click Format JSON, Minify JSON, or Validate — then Copy Output from the read-only panel.
Every control in the live JSON formatter component.
Used only by Format JSON — controls pretty-print spacing via JSON.stringify third argument.
Checkbox — recursive alphabetical key order on objects before serialize; default off.
Editable monospace field, 16 rows; placeholder shows minimal object example.
Read-only result panel, 16 rows, zinc background — updated by Format, Minify, or Validate success.
Three actions sharing JSON.parse — errors surface parser message in rose banner.
Copy writes output textarea to clipboard; Clear empties input, output, and errors.
Characters and Lines counts derived from current output string after each successful action.
When to use each button on the toolbar.
Pretty-print with chosen indent and optional sorted keys — best for reading API responses and config files.
Single-line JSON.stringify output — shrinks payload size; respects sort keys when enabled.
Syntax check only — does not re-indent; on success output mirrors input text and error clears.
Stable key order for git diffs — e.g. active, category, features, name instead of insertion order.
Compact multi-line without leading spaces per level — middle ground before full minify.
Native JSON.parse exceptions shown verbatim — fix commas, quotes, or trailing tokens in input.
After formatting webhook JSON, test field extraction patterns in the Regex Generator. Seed mock records with the GUID Generator before pretty-printing arrays of objects.
Turn formatted JSON arrays into HTML for docs with the HTML Table Generator.
Aligned with the live JSON formatter component.
Adjustable 0–8 space indent with default 2 for readable nested structures.
Strip whitespace for production payloads and log shipping.
Dedicated Validate button without forced reformatting of valid input.
Optional alphabetical object keys at every depth for diff-friendly output.
Input and output textareas on large screens for before/after comparison.
No sign-up; JSON stays in the browser during editing.
Where JSON formatting saves debugging time.
Paste fetch() responses, Format JSON, scan nested fields with indentation.
Beautify package.json fragments or deployment config before code review.
Validate incoming body, then minify for replay tools or ticket attachments.
Extract `{...}` from logs, validate, pretty-print to find the failing key.
Format with indent 2 and copy Output into README or OpenAPI examples.
Sort keys before committing test JSON so CI diffs stay stable.
Actions, options, and related Muxgen utilities.
Format optimizes human reading; minify optimizes bytes on the wire.
Validate checks syntax without changing spacing unless input was already pretty.
Requires valid JSON to parse — regex tool handles partial or non-JSON text.
Reorders properties — disable when semantic key order matters in hand-written files.
Formatter serializes trees; HTML Table Generator builds tables from flat rows.
Quick paste-and-copy UI — no install; jq better for shell pipelines.
Terms used in the formatter UI.
JavaScript Object Notation — text format for objects, arrays, strings, numbers, booleans, and null.
Indented, line-broken output from JSON.stringify with spacing argument.
JSON.stringify without whitespace — minimal character count.
Browser API that throws on invalid syntax — powers all three actions.
localeCompare on property names — does not sort array elements.
Error message from failed parse — shown in rose status banner.
Keep payloads readable, valid, and safe to ship.
Run Validate on config JSON after manual edits to catch trailing commas early.
Match team standard (often 2) so formatted output matches Prettier or editor defaults.
Keep pretty JSON in git; minify when sending over network if size matters.
Confirm Sort object keys does not confuse readers who expect custom key order.
Client-side only — still clear sensitive JSON before screen sharing.
Use character count to estimate bandwidth savings before shipping APIs.
Habits that pair with Format, Minify, and Validate.
Click Format JSON on the loaded Muxgen sample to see indent and banner behavior.
When input is unknown, Validate first — then Format once error banner is green.
Paste generated UUIDs into id fields, then format the whole object.
Drop five-field cron strings into JSON settings, format for review.
Line count jumps on format — drops to 1 on minify for quick sanity check.
Use Clear when switching projects so prior API responses do not linger.
Format vs minify vs validate, indent, sort keys, stats, privacy, and sample JSON.
Explore more tools in the directory.
Test patterns against JSON substrings or log lines before formatting.
Mock API keys for Authorization headers in JSON request examples.
UUID v4 values to paste into JSON fixture id fields.
Bulk unique IDs for seeding JSON array test data.
Schedule strings for JSON config files that store cron fields.
Turn tabular JSON arrays into HTML tables for docs after formatting.