Zlvox Tools

JSON Slayer

Flatten deeply nested JSON into clean key-value pairs. Validate, minify, prettify, search keys, and export to CSV or TSV. PHP server-side engine -- your browser does nothing.

Recursive Flatten Validate + Fix Minify / Prettify Key Search CSV / TSV Export History PHP Server-Side
5MB+JSON support
0Client CPU used
FreeAlways
Options
Editor
Input 0 chars
Raw JSON 0 chars
Flattened Output 0 keys
Processing on server... 0%
Input size
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Keys flattened
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Max depth
--
Server time
--
Output size
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Validate & Format
Prettified
Minified
Recent Sessions
No flatten history yet. Run a flatten operation to see it here.
What it does
PHP Server-Side Engine
All JSON processing runs on the server. Your browser's CPU is not used at all -- only the result comes back. Handles 5MB+ payloads without breaking a sweat.
Recursive Flattening
Converts any depth of nesting into flat dot-notation key-value pairs. Supports objects, indexed arrays, mixed structures, and empty nodes -- all handled correctly.
Validate + Format
Validate any JSON instantly. Prettify messy one-liners or minify formatted JSON for production. Error messages tell you exactly what line went wrong.
Key Search & Filter
After flattening, search and filter output keys in real-time. Find exactly the nested path you need without scrolling through thousands of lines.
Multi-Format Export
Export flattened data as Flat JSON, CSV (Excel-ready, with proper quote-escaping), or TSV. Download or copy directly from the toolbar.
Zero Storage
Your JSON is processed and immediately discarded. No database writes, no log files, no session storage of your data. Safe for sensitive API payloads and private data.
Common questions

Everything you need to know

What is JSON flattening and why do I need it?

JSON flattening converts deeply nested objects into single-level key-value pairs. When you have complex API responses, databases and spreadsheets cannot process them directly. After flattening, keys like user.profile.name are created that any system can use.

Data EngineeringETL PipelinesAPI Integration
How large a JSON can this handle?

Server-side processing means your browser CPU is never used. The tool easily handles 5MB+ JSON files. For large output, the first 1,000 lines are previewed in the editor -- the full data is always available via Download or Copy.

5MB+ supportedZero client load
Is my JSON data saved on the server?

No. Data comes to the server only for processing and the result is returned immediately. It is not saved in any database or log. After processing PHP discards it from memory. Safe for sensitive API responses and private data.

Zero storagePrivacy safe
Which separator should I use?

. Dot -- best for JavaScript, Elasticsearch, MongoDB. / Slash -- ideal for REST API paths, Firebase. _ Underscore -- perfect for SQL column names and Python variables. -> Arrow -- PHP associative arrays and readable debugging.

What is the difference between CSV and TSV output?

CSV uses commas and is compatible with Excel and Google Sheets -- values containing commas are automatically quote-escaped. TSV uses tab characters, which is more reliable for database imports when your values themselves contain commas.

Excel readyDB import