JSON / CSV Toolkit
Format, validate, minify JSON — convert between JSON and CSV — or diff two JSON objects. 100% browser-side.
How to Use This Toolkit
- Choose a mode — JSON Formatter, CSV → JSON, JSON → CSV, or JSON Diff.
- Paste your data — paste raw JSON or CSV into the input area.
- Process — the tool validates, converts, or compares your data instantly.
- Review stats — the JSON Formatter shows a structure analysis with a type breakdown chart.
- Copy or download — use the Copy or Download buttons to export results.
What Each Tab Does
JSON Formatter
Pretty-print, validate, or minify JSON. Shows root type, max nesting depth, and value type distribution.
CSV → JSON
Parse comma-separated data with headers into a JSON array of objects. Shows row and column counts.
JSON → CSV
Convert a flat JSON array of objects into CSV format with proper escaping.
JSON Diff
Compare two JSON objects side by side. Shows added, removed, and changed keys with color coding.
Why Use This Tool
- Quick debugging — validate and format messy JSON from APIs or logs.
- Data conversion — convert between CSV (spreadsheets) and JSON (APIs) without writing code.
- Structure analysis — understand JSON complexity with depth analysis and type breakdown charts.
- Change detection — diff two API responses or config files to spot differences.
- Privacy — everything runs in your browser. No data is sent to any server.
Frequently Asked Questions
Is my data sent to a server?▾
No. All processing happens in your browser using JavaScript. Nothing is uploaded.
What CSV format does it support?▾
Standard comma-separated values with a header row. Quoted fields and escaped quotes (double-quotes inside quotes) are supported.
Can it handle nested JSON?▾
The JSON Formatter handles any valid JSON including deeply nested objects. The structure analysis shows max nesting depth. The JSON → CSV converter works best with flat arrays — nested values are serialized as strings.
How does JSON Diff work?▾
It does a deep key-by-key comparison of two JSON objects. Added keys show in green (+), removed keys in red (-), and changed values in amber (~). Nested objects are compared recursively.
Is there a size limit?▾
No hard limit. Very large files (10MB+) may slow your browser. For large datasets, use jq (command line) or a spreadsheet application.
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