JSON Flattener & Unflattener

Flatten nested JSON into typed JSON Pointer entries and rebuild it.

Tool options · presets, sharing & more

Presets & sharing: options only, never files, text or passwords. Undo/redo: editable form values, not file selection or generated results.

How to Use JSON Flattener & Unflattener

Paste the input into the labeled fields.

Choose the schema, format, paths, or other settings for this operation.

Run the tool and inspect the output and validation messages.

Copy the result or download the generated file.

What This Tool Does

Flatten nested JSON into typed JSON Pointer entries and rebuild it. Uses RFC-style JSON Pointer paths and typed containers. Unflatten expects the complete array produced by Flatten.

Common Use Cases

Validating test fixtures, configuration files, and API payloads.

Preparing code or data for a project while keeping inputs local.

Privacy & Processing

This tool processes files and input in this browser tab. Its processing code does not upload them to a server. Loading this page and fetching uncached app files uses an internet connection. Optional usage analytics requires your consent and excludes input, filenames, passwords and generated content. Form undo history and result transfers stay in session memory. Explicitly saved presets contain approved settings only.

Offline use is not verified for this tool. Keep an internet connection available to load its page, code and any additional dependencies.

Frequently Asked Questions

What should I check before using the result?

Uses RFC-style JSON Pointer paths and typed containers. Unflatten expects the complete array produced by Flatten.

Are my files or inputs uploaded?

No. This tool processes selected files and entered data locally in your browser. Only the page and its supporting code are downloaded.

Does this tool work offline?

Offline use is not verified for this tool. Keep an internet connection available to load its page, code and any additional dependencies.