Flatten a JSON Object
Create a single-level object from nested JSON objects. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Flatten a JSON Object
- 1. Paste your nested JSON object. Paste a JSON object with properties nested several levels deep, the kind that is hard to scan or store in a system that only handles flat key-value pairs.
- 2. Set the path separator and array handling. Type the character to join nested key names with in Path separator, commonly a dot, and turn on Flatten arrays to give each array item its own numbered key instead of leaving arrays intact.
- 3. Pick the output indent and copy. Choose 2 spaces, 4 spaces or tabs for the Indent setting, then copy the flattened object where every key is now a single dotted path pointing straight at its value.
When to use Flatten a JSON Object
Flatten a JSON Object turns a deeply nested structure into a single-level object where each key is a dotted path to its value, like user.name instead of a separate user object. Reach for it when a system expects flat key-value pairs rather than nested JSON.
- Preparing data for a flat key-value store. You are writing nested config into a system like environment variables or a flat key-value database, and every setting needs to become a single dotted-path key.
- Building column headers for a spreadsheet export. You want to turn a nested JSON record into spreadsheet columns, and flattening it first gives you dotted-path column names like address.city instead of one unreadable nested cell.
- Comparing two nested objects field by field. You want to diff two versions of a deeply nested config and a flat list of dotted paths and values is much easier to compare line by line than nested braces.
- Feeding data into a form-generation library. Some form builders expect flat field names rather than nested objects, and flattening your JSON schema first produces the dotted keys those libraries want.
Examples
Flatten nested objects into key paths
Input
{"user": {"name": "Ada", "tags": ["a", "b"]}}Output
{
"user.name": "Ada",
"user.tags.0": "a",
"user.tags.1": "b"
}About the Flatten a JSON Object tool
Flatten a JSON Object does its work locally, right in the browser. Create a single-level object from nested JSON objects. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the JSON Tools collection on EditSafely, a set of 90 small, focused JSON utilities that share the same instant, private workspace.
You can shape the output with 3 settings, including Path separator, Flatten arrays and Indent, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Flatten a JSON Object cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.