Can I reorder keys or change value types?

Yes. Each node has move up / move down buttons to reorder keys or array items within the same level. The type selector converts a value's type and carries over the value where it makes sense (e.g. the string "123" to the number 123, or an object to an array).

What happens if I paste invalid JSON?

If the input cannot be parsed as JSON, an error message is shown and nothing is loaded into the tree. Fix the JSON and load it again. Loading empty input starts you off with an empty object {} you can build from.

No. Parsing, editing, and formatting all run entirely in your browser. The JSON you paste is never uploaded or stored on a server.

Yes, it is completely free. No sign-up and no installation required.

JSON tree editor

Q: What can this JSON editor do?

Paste JSON and it renders as an editable tree (a hierarchy of keys and values) that you edit directly in the browser. You can add, edit, remove, and reorder keys, switch a value's type (string, number, boolean, null, object, array), and edit nested objects and arrays. Edits are validated live and the result can be copied or downloaded as a formatted JSON string.

JSON tools

Paste JSON and edit it in a tree / key-value view — add, edit, remove, and reorder keys. Everything runs in your browser; your data is never uploaded.

What is this JSON editor?

A free, browser-based JSON editor with a tree / key-value view. Paste any JSON and edit it visually: add, edit, remove, and reorder keys; switch a value's type (string, number, boolean, null, object, array); and drill into nested objects and arrays. Edits are validated live and reflected into a formatted JSON string you can copy or download. Everything runs locally in your browser, so your data is never uploaded.

How to use it

Paste your JSON on the left and click “Load into editor”.
Edit the tree on the right: rename keys, change values, or switch a node's type.
Use “Add key” / “Add item” to insert, the trash icon to remove, and the up/down arrows to reorder.
Copy or download the live JSON output once it looks right.

Common use cases

Tweaking a config, fixture, or API response by hand without fighting raw syntax.
Reordering or renaming keys and re-typing values while keeping valid JSON.
Building a small JSON document from scratch in a structured, visual way.

Related tools

JSON formatter / beautifier — pretty-print or minify a JSON string.
JSON validator & diff — validate JSON and compare two documents.

FAQ

Operated by

Tools by Timothe AI is a suite of free tools built and operated by unbounded pioneering inc, the company behind Timothe AI.

Ryosuke SuzukiFounder & CEO

Founder & CEO of Unbounded Pioneering Inc., the company behind Timothe AI, and an expert in machine learning and AI product development. He began his career in machine learning research at a university laboratory, then designed and built large-scale products as a software engineer at PLAID, Rakuten, and Recruit, while also driving new business development. Now specializing in generative AI and AI products, he works across both engineering and business development, and is a named inventor on multiple granted patents in web technology.

Named inventor on granted patents JP6887648 & JP7480958 · Patent pending on Timothe AI technology

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