About the JSON Formatter & Validator
A browser-based tool for formatting, validating, minifying, and exploring JSON — built for developers.
What it is
The JSON Formatter & Validator gives you instant feedback the moment you paste JSON into the editor. It validates your input in real time, formats it into clean, properly indented code, and highlights syntax errors with line numbers so you know exactly where to look.
Everything runs entirely in your browser. Your JSON is never sent to a server or stored anywhere — close the tab and it's gone. This makes it safe to use with API responses, config files, and any data you wouldn't want to paste into an unknown web service.
Key features
Format & Beautify
Converts minified or poorly indented JSON into clean, readable code with consistent 2-space indentation.
Minify
Strips all whitespace to produce a compact single-line JSON string — useful before sending data over a network or storing in a config.
Validate with Error Lines
Parses your JSON on every keystroke and shows clear error messages with the line number where the problem occurs.
Collapsible Tree View
Renders your JSON as an interactive tree with expandable and collapsible nodes — ideal for navigating deeply nested structures.
Who it's for
Backend developers
Quickly inspect and validate API responses, request payloads, and database query results without opening a dedicated IDE.
Frontend engineers
Debug JSON from REST APIs or GraphQL responses on the fly — copy from DevTools, paste here, and see it formatted instantly.
DevOps & platform teams
Validate config files, CI/CD pipeline definitions, and infrastructure-as-code manifests before committing or deploying.
Data engineers
Explore and clean JSON data exports before importing into databases, spreadsheets, or data pipelines.
Completely free
No account, no rate limit, no premium tier. Paste a five-line config or a 5,000-line API response — both work instantly. If you find it useful, sharing it with a colleague who needs a quick JSON check is all we ask.