What does the JSON Formatter & Validator do?

The JSON Formatter & Validator on PowerSEOTools.online formats and beautifies JSON, validates the syntax, highlights errors, and shows syntax highlighting so you can debug APIs and configuration files more easily.

How do I format JSON with this tool?

Paste or type your JSON into the editor and click Format & Validate. The tool will parse the JSON, show a pretty-printed version with syntax highlighting, and display either a success message or detailed error information.

Does this JSON formatter show errors with line and column?

Yes. When JSON parsing fails, the tool tries to extract the error position and estimate the line and column number so you can quickly see where the problem is in your JSON string.

Is the JSON Formatter & Validator free?

Yes. The JSON Formatter & Validator is completely free to use with no login required and no usage limits, subject to fair use of the site.

Is my JSON data sent to a server?

No. All formatting, validation and syntax highlighting happens directly in your browser using JavaScript. Your JSON never leaves your device, making it safe for sensitive API responses and configuration files.

JSON Formatter & Validator

Format, validate and beautify JSON data with syntax highlighting, error detection, minification and structural stats. Perfect for API responses, config files and debugging complex JSON payloads.

JSON input

Formatted JSON output

Pretty-printed JSON with syntax highlighting

// Formatted JSON will appear here.

JSON Structure

Root type —

Total keys 0

Total values 0

Arrays 0

Max depth 0

Size & Formatting

Characters (input) 0

Characters (formatted) 0

Lines (formatted) 0

Approx. size (UTF-8) 0 B

Validation Result

Status Not validated

Error message —

Error position —

Error line:column —

Free Online JSON Formatter & Validator

The JSON Formatter & Validator from PowerSEOTools.online helps developers, analysts and technical SEOs quickly clean up and debug JSON. Whether you are working with REST APIs, structured data, log files or configuration files, readable JSON saves time and reduces errors.

Key Features

Beautify JSON: Pretty-print any valid JSON with consistent indentation.
Validate syntax: Instant feedback when JSON is invalid, including error messages and position.
Error line & column: Approximate line and column numbers help you jump straight to the issue.
Syntax highlighting: Keys, strings, numbers, booleans and null values are color-coded.
Minify JSON: Remove all unnecessary whitespace to produce compact JSON for production and network transfer.
Structural stats: See total keys, arrays, values and maximum depth to understand complexity.
Copy & download: Copy formatted JSON to your clipboard or download it as a .json file.
Privacy-friendly: Everything runs in your browser – nothing is sent to a server.

How to Use the JSON Formatter

Paste your JSON into the input box.
Click Format & Validate or press Ctrl+Enter.
If the JSON is valid, you’ll see a formatted version on the right with syntax highlighting.
If there is an error, the tool will show the message, character position, and an estimated line and column.
Use Minify to compress valid JSON into a single line.
Click Copy to copy the formatted JSON or Download to save it as a file.

Typical Use Cases

Debugging REST API responses during development.
Cleaning up JSON config files before committing to version control.
Inspecting structured data such as Schema.org markup and Open Graph tags.
Exploring large nested JSON objects from analytics platforms, logs or exports.

Combine this JSON Formatter with other Developer & Encoding Tools on PowerSEOTools.online for a complete browser-based toolkit – no extensions or IDE plugins required.