JSON Editor
Edit JSON with live syntax highlighting and real-time error detection. Lightweight, instant, no install required.
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Frequently asked questions
What makes a good JSON editor?
A good JSON editor combines editable input with immediate feedback: syntax highlighting so you can read structure at a glance, real-time error detection with precise line numbers, line count display, and formatting shortcuts. This tool provides all of those without requiring any install or account.
How does syntax highlighting work?
This editor loads highlight.js from a CDN and runs it in your browser to colorize your JSON as you type. String values appear in green, numbers in blue, booleans in amber, and structural tokens (braces, brackets) in gray — making it easy to spot mismatches.
How do I fix JSON errors quickly?
The status bar shows the exact line and column of your cursor, and the error gutter marks the problematic line with a red indicator. Click "Validate" to see the full error message, or "Format" to auto-fix indentation once the syntax is corrected.
What is the difference between editing JSON and editing YAML?
JSON uses strict syntax (double quotes, no trailing commas, no comments) and is the standard for APIs. YAML is more human-friendly (no quotes, supports comments, indentation- based) and is common in config files (Docker Compose, Kubernetes). Use our JSON to YAML converter to switch between formats.
Is this JSON editor safe to use with private data?
Yes. Everything runs in your browser tab. The only external request is to load highlight.js from a public CDN — your JSON content itself is never sent anywhere.