JSON Formatter
Beautify · Minify · Tree view · Syntax validation
JSON Formatter
Ready
ABOUT
About JSON Formatter
JSONSort JSON Formatter beautifies, minifies, and validates JSON locally in your browser. Supports JSON5 comments, key sorting, and collapsible tree view—ideal for debugging API responses and config files.
Whether debugging REST APIs, reviewing config files, or preparing JSON examples for docs, formatting is the first step. JSONSort integrates validation, beautify, and tree browsing in one workspace—no switching between multiple sites.
DEEP DIVE
Learn More About JSON Formatter
JSON (JavaScript Object Notation) is the most common data exchange format for Web APIs and config files. Unformatted JSON often sits on one line, making it hard to read and debug. JSONSort Formatter supports 2/4/6-space indent, alphabetical key sorting, Unicode escape preservation, and more.
Unlike most online formatters, JSONSort runs entirely in your browser. Production API responses, config files with user info, and internal API payloads can be pasted safely—no data passes through third-party servers.
The JSON standard (RFC 8259) requires double-quoted strings, string object keys, and no comments. In practice you often encounter JSON5, UTF-8 files with BOM, or incomplete fragments from logs—this tool parses locally with helpful error hints so you catch issues before committing or writing to a database.
FEATURES
Core capabilities
Beautify & minify
One-click toggle between Pretty Print and Minify for code review and production transport.
JSON5 compatible
Supports non-standard JSON syntax: comments, trailing commas, single quotes—convenient for editing config files.
Tree view
Renders nested objects as a collapsible tree—faster than plain text for locating deep fields.
Syntax error location
Highlights error line numbers on parse failure—quickly find missing commas or mismatched brackets.
Drag & drop import
Drop .json / .json5 files, or paste raw text copied from log files.
One-click copy & export
Copy formatted results to clipboard or export as .json file.
Multiple indent levels
Switch freely between 2 / 4 / 6 spaces to match team ESLint / Prettier conventions.
Sort keys
Output keys in alphabetical order to reduce noisy Git diffs.
HOW TO USE
How to use
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1
Paste or drag a JSON file into the input area
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2
Choose beautify/minify mode and indent width
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3
View formatted results or tree structure; copy or export in one click
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4
Adjust indent, JSON5, sort, and other advanced options in the toolbar
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5
Copy results or continue with Diff, path query, and other tools
WORKFLOW
Typical workflow
End-to-end workflow from import to export, helping teams standardize JSON Formatter usage.
Get raw data
Copy JSON from Network panel, log files, or database exports into the input area, or drag a .json file.
Choose output mode
Debugging: beautify + tree view; storage/transport: minify; config files: enable JSON5 and sort keys.
Locate issues
On syntax errors, check highlighted line numbers; for structure exploration, expand target nodes in tree view.
Export & reuse
One-click copy to clipboard or download .json; continue with Diff, path extraction, and other tools.
USE CASES
Use cases
Frontend developers
Format fetch/axios API responses and use tree view to inspect nested fields.
Backend developers
Minify JSON logs for storage, or beautify config.json for Git diff review.
QA engineers
Validate whether API responses are valid JSON; quickly locate problem lines on Syntax Error.
Technical writing
Beautify JSON samples for embedding in API docs to improve readability.
SRE / DevOps
Format K8s Event and alert webhook JSON payloads to quickly locate anomalous fields.
Data Analyst
Expand compact JSON exported from BI tools and use path extraction to filter metrics.
TIPS
Tips
- Format before analyzing when debugging APIs—several times faster than reading one-line JSON.
- For large JSON over 1MB, use minify mode to reduce render pressure, or enable tree view and expand on demand.
- Config files with // comments must enable JSON5, otherwise standard JSON parsers will error.
- To compare two JSON documents, format then copy to the Smart Diff tool for Diff.
- Use Share Link when sharing debug data—collaborators can reproduce the same input instantly.
- Combine format + sort keys so Git diff shows only real business changes.
- After Copy response from Chrome DevTools Network panel, paste directly to format.
- If JSON comes from Python dict with single quotes, replace with double quotes or try JSON5 mode.
- Character count after formatting helps assess whether API response size needs gzip.
- Compare size before/after with minify mode before export to inform API performance decisions.
LOCAL VS ONLINE
Local vs online tools
JSONSort stays purely frontend—this comparison shows why local tools fit dev data better.
TROUBLESHOOTING
Common pitfalls & fixes
Issues you may hit in practice and how to handle them—save time on trial and error.
Unexpected token after paste
Tip:Check for mixed HTML, single quotes, or non-JSON text; try JSON5 or trim unrelated characters at start/end.
Chinese displays as \uXXXX
Tip:Disable Unicode escape option, or use Unicode → Chinese mode in the Escape tool to restore.
Large file causes page lag
Tip:Switch to minify mode first, or use Merge & Clean to remove unused fields before formatting.
Results differ from online tools
Tip:Confirm indent width and sort options match; JSONSort local parsing has no network variance.
FAQ
FAQ
Does it support JSON5?
Yes. Enable JSON5 mode to parse JSON with comments, trailing commas, and single-quoted strings.
Does key order change after formatting?
Original order is preserved by default. Enable Sort keys for alphabetical output—easier for comparison.
What's the difference between tree view and text view?
Text view outputs standard JSON strings; tree view shows structure as interactive nodes—better for exploring deep nesting.
Can minified JSON be restored?
Minify only removes whitespace—it does not change data. Switch back to beautify mode anytime for indented format.
Can it handle NDJSON (one JSON per line)?
Currently parses as a single JSON document. For NDJSON, split by line and format each entry separately.
Does formatting change number precision?
No. Re-serialization after parsing preserves integer and large number precision within JavaScript safe integer range.
Is data uploaded to a server?
No. All JSONSort tools run locally in your browser—your input is never sent to any backend.
Do I need to sign up or install anything?
No. Open the page and go—no account, no client download, PWA offline cache supported.
How large can files be?
Depends on browser memory; multi-MB data usually runs smoothly. Split very large files or use merge & clean first.