JSON Flatten / Unflatten Online
Convert complex, nested trees of JSON data into simple, single-level dictionaries or unflatten flat path-keys back to original hierarchical structures fully locally in your browser.
When Is Flattening JSON Useful?
In modern computing, data is often exchanged in nested JSON structures, but analytical databases, spreadsheets (like Google Sheets or Microsoft Excel), and CSV parsers prefer simple flat rectangular rows. Flattening converts hierarchical properties like "user.contacts.email" into simple string keys at the root, making nested structures immediately importable in tabular applications.
Choosing Delimiter Sepators
The delimiter separates distinct levels in the object tree. Standard developers use dot notation (.), which is typical in programming properties (e.g., JavaScript object paths). Databases and environments (such as Kubernetes environment variables) frequently prefer slashes (/) or underscores (_) to align with path routes and system definitions.
Frequently Asked Questions
What is Safe Mode for Arrays?
By default, flattening inspects array indices (e.g. tags.0). In Safe Mode, array structures are treated as values and preserved intact, flattening only object properties surrounding them.
Can I unflatten arbitrary keys?
Yes, any object where keys are split by the selected delimiter (such as dot or slash) can be unflattened. The algorithm will re-assemble nested dictionary nodes and array lists dynamically.
Related JSON Suit Utilities
Learning Resources & Tutorials
Master the intricacies of parsing and schemas for JSON Flatten / Unflatten.
Suggested Learning
Intro to JSON Schema Specification
Designing Safe API Payloads using JSON Linter
Debugging JSON syntax issues instantly
Integration Examples
Typical developer setting schema.
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"port": { "type": "integer", "default": 3000 }
}
}Developer Workflow
How JSON Flatten / Unflatten fits inside the development and debugging lifecycle.
Validate & Lint
Verify syntactic validity
Active StageFormat & Pretty
Indentation & visualization
Search & Query
Query with JSONPath/Search
Validate Schema
Check business logic compliance