JSON Formatter & Validator
Format, beautify, and validate your JSON data to ensure it's readable and error-free.
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Overview
The JSON Formatter & Validator is an essential tool for developers working with JSON (JavaScript Object Notation). It takes raw JSON data and pretty-prints it with consistent indentation, making it easy to read and understand complex structures. Additionally, it validates the JSON against syntax rules, immediately highlighting any errors.
Use Cases
Debugging API responses by making the JSON output human-readable.
Formatting JSON configuration files for clarity and maintainability.
Validating user-inputted JSON or JSON received from external sources.
Learning or teaching JSON structure by visualizing its formatted layout.
Ensuring JSON data is syntactically correct before sending it to an API or processing it in an application.
How It Works
Paste your JSON string into the input text area. Click the "Format & Validate" button. The tool attempts to parse the input using JSON.parse(). If the JSON is valid, it's then re-formatted using JSON.stringify(parsedData, null, 2) which adds 2-space indentation. The beautified JSON is displayed in the output area. If the input is not valid JSON, an error message indicating the issue (often with a line or character reference) is shown.
Tips for Better Usage
Always validate JSON from untrusted sources before processing it in your applications.
Formatted JSON is significantly easier to navigate, especially for deeply nested objects or long arrays.
The error messages from the validator can help pinpoint syntax issues like missing commas, incorrect quotes, or mismatched brackets.
For extremely large JSON files, browser performance might be a consideration as processing is client-side.