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JSON editor

Edit, validate and explore JSON in a tree or code view.

About this tool

Edit JSON visually in a tree or switch to raw code when you need precision. Validation catches syntax errors before you copy the result back into your app or API client.

Why use it

  • Tree view makes nested objects easy to expand and edit.
  • Code mode for bulk paste and search-replace workflows.
  • Minify with one click for production payloads.

Common use cases

  • Fix a broken config file from a deployment error log.
  • Explore an API response before mapping fields in code.
  • Tidy JSON before committing to documentation.

Tips

  • Load pasted JSON first, then switch modes — the editor keeps the same data.
  • Use tree view to spot missing keys; use code view for fast renames.
How to use
  1. Paste JSON and load.
  2. Edit in tree or code mode.
  3. Copy or minify the result.
FAQ
Is my JSON sent to a server?
No. The editor runs entirely in your browser; your data stays on your device.
What is the difference from the JSON formatter?
The formatter pretty-prints or minifies text. The editor lets you change values in a tree or code view.
Can I edit nested objects?
Yes. Tree mode expands objects and arrays so you can edit fields individually.
Does it validate JSON?
Invalid JSON shows an error when you load or export; fix syntax before copying.
Can I switch between tree and code?
Yes. Use the mode menu in the editor toolbar after loading valid JSON.
Is there a size limit?
Very large documents may slow the browser, but nothing is uploaded to Frespy.

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