Paste JSON or type. Real-time validation with error highlights. Tree view, format, minify. Edit values directly.
JSON is daily work for developers. Validate, format, explore nested structures easily.
Yes, continuous validation.
Yes, prettify compressed JSON.
Yes, handles large documents.
Yes, edit values directly in tree.
A JSON editor does four things a plain text editor can't: validates syntax as you type (catches missing commas, unmatched braces, invalid values), highlights errors with line numbers and red markers, auto-formats messy JSON into clean indented output, and supports tree view to collapse and expand nested structures. For small one-line JSON values, plain text works. For multi-kilobyte JSON files with deep nesting, a JSON editor saves hours of debugging.
Developers edit JSON constantly: debugging API responses, writing config files (package.json, tsconfig.json), creating mock data, transforming API output, configuring cloud services (AWS, Azure, GCP all use JSON), editing game saves, writing test fixtures. A JSON editor with validation prevents the "works locally, fails in production" problem caused by a trailing comma.
Standard JSON is strict: no comments, no trailing commas, double quotes only. JSON5 (and JSONC, JSON with comments) relaxes these for human-friendly editing — but most APIs require strict JSON. If you're editing config files for VS Code (which uses JSONC), comments are fine. If you're prepping data for an API, validate to strict JSON before sending. Our editor outputs strict JSON by default.
View, edit, format, and validate JSON data with the Toolzie JSON Editor. Switch between tree view and raw text view, collapse nested objects, and detect syntax errors instantly — ideal for developers working with APIs.
Yes — syntax errors are highlighted in real time with the line number and error description.
Yes — in tree view, click any object or array node to collapse or expand it.
Use your browser's built-in find (Ctrl+F) in text mode to search through the JSON content.
Yes — use the Minify button to remove all whitespace and produce compact JSON.