JSON Syntax Highlighter
Highlight JSON with color-coded keys, strings, numbers, booleans and null values. Free online JSON syntax highlighter —
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How to Use JSON Syntax Highlighter
- Paste your JSON: Paste any JSON — minified or formatted — into the input box.
- Click Highlight: Press the Highlight JSON button. The tool beautifies and color-codes keys, strings, numbers and booleans.
- Copy plain JSON: Use the Copy button to grab the clean, valid JSON text without any HTML color codes.
About JSON Syntax Highlighter
JSON Syntax Highlighter beautifies your JSON and color-codes every element so you can scan data at a glance.
- Color Coding: Keys in purple, strings in green, numbers in yellow, booleans in blue and null values in gray.
- Auto-Beautify: Minified input is formatted with indentation before highlighting.
- Monospace Rendering: Clean code-style output for maximum readability.
Great for reviewing large API responses, teaching JSON syntax and spotting data issues quickly.
Frequently Asked Questions
What does JSON syntax highlighting do?
It beautifies your JSON and color-codes every element: purple keys, green strings, yellow numbers, blue booleans and gray null values — so you can scan data faster.
Can I copy the highlighted output?
Yes. Click the Copy button — the plain, valid JSON text is copied to your clipboard, not the HTML colors.
Is this free and private?
100% free and private. Highlighting happens entirely in your browser, so your data never touches a server.