Developer JSON Utility
JSON Flattener & Unflattener
Flatten deeply nested JSON into delimiter-based keys, unflatten flat JSON back into nested objects, validate malformed input, and inspect structure metrics with PHP-backed processing.
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Source JSON
Live Preview
Processed JSON
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JSON Flattening Guide
Transform nested JSON into practical flat structures
Use this JSON Flattener and Unflattener when APIs, databases, spreadsheets, logs, or ETL pipelines need predictable key paths instead of deeply nested data.
What is JSON Flattening?
JSON flattening converts nested objects and arrays into a single-level object where each key represents the original path, such as user.profile.name.
What is JSON Unflattening?
JSON unflattening reverses flat key paths into the original nested object or array structure using the selected separator.
Benefits of Flattening JSON
Flattened JSON is easier to compare, index, search, map into tables, and pass through systems that prefer simple key-value records.
Common Use Cases
Developers use flattened JSON for API development, database storage, data analysis, ETL workflows, logging, configuration review, and spreadsheet exports.
API Development
Flatten API responses to inspect nested payloads quickly, compare response changes, or map data fields into client applications.
Database Storage
Store nested data in column-oriented systems or searchable indexes by turning nested paths into consistent flat keys.
Data Analysis
Flatten JSON before moving records into BI tools, CSV files, notebooks, or spreadsheet models for easier filtering and grouping.
ETL Workflows
Normalize incoming JSON during extraction and transformation steps before loading it into warehouses, queues, or reporting systems.
Frequently Asked Questions
JSON Flattener FAQ
What is a JSON Flattener?
A JSON Flattener converts nested objects and arrays into a flat object with path-based keys.
How does JSON Unflattening work?
Unflattening splits each flat key by the selected separator and rebuilds the nested object structure on the server.
Can nested arrays be flattened?
Yes. Enable Flatten arrays to include array indexes in the output keys, such as users.0.name.
Is my JSON stored?
No. The tool processes JSON through WordPress AJAX and does not store submitted content.
How large can JSON files be?
The production safety limit is 1 MB per request to protect server memory and keep live processing fast.
Is the tool secure?
Yes. Requests use WordPress nonce verification, input size checks, sanitization, JSON validation, and escaped output.
What separators are supported?
Dot, underscore, slash, hyphen, and custom separators up to 16 characters are supported.