JSON: The Complete Guide for Developers
Everything you need to know about JSON - syntax, data types, and best practices.
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JSON Formatter & Validator
Data FormatsBeautify, minify, and validate JSON data
Learn More About JSON Formatter & Validator
3 articles to help you understand and use this tool effectively
Working with JSON in JavaScript: Parse, Stringify & More
Parse, stringify, and manipulate JSON data effectively in JavaScript applications.
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Validating JSON with JSON Schema: A Practical Guide
How to define and validate JSON data structures using JSON Schema.
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JSON Formatter & Validator FAQ
Common questions about using the JSON Formatter & Validator tool
To format JSON: 1) Paste your JSON in the input field, 2) Click 'Format' or it formats automatically, 3) The beautified JSON appears with proper indentation, 4) Copy the formatted result. The tool validates syntax and highlights any errors.
Paste your JSON into the tool - it automatically validates syntax. Invalid JSON shows an error message with the line number and description of the problem. Common issues include missing quotes, trailing commas, and unescaped special characters.
JSON.parse() converts a JSON string into a JavaScript object. JSON.stringify() converts a JavaScript object into a JSON string. Use parse() when receiving JSON data, stringify() when sending data or storing objects as text.
Common JSON errors: 1) Single quotes instead of double quotes, 2) Trailing commas after last item, 3) Unquoted property names, 4) Comments (not allowed in JSON), 5) Undefined or function values, 6) Unescaped control characters in strings.
To minify JSON: 1) Paste your JSON in the input, 2) Select 'Minify' mode, 3) Copy the compacted result. Minification removes all whitespace and newlines, reducing file size for production use while keeping the data identical.
JSON supports six data types: strings (double-quoted), numbers (integer or floating-point), booleans (true/false), null, arrays (ordered lists), and objects (key-value pairs). It does NOT support undefined, functions, dates, or special number values like NaN/Infinity.
JSON has no native date type. Common approaches: 1) ISO 8601 strings ('2024-01-15T00:00:00Z'), 2) Unix timestamps (1705276800), 3) Custom string formats. Use a reviver function with JSON.parse() to convert date strings back to Date objects.
No, standard JSON does not support comments. If you need comments, consider: 1) Using JSONC (JSON with Comments) for config files, 2) Adding a '_comment' field, 3) Using YAML instead. Most JSON parsers will error on comments.
JSON Schema is a vocabulary for validating JSON documents. It defines the structure, data types, and constraints of your JSON data. Use it for API validation, form generation, and documentation. Libraries like Ajv (JavaScript) implement validation.
Use JSON.stringify() with spacing: JSON.stringify(obj, null, 2) for 2-space indentation. The second argument is a replacer function (null for none), the third is the indentation (number of spaces or string like '\t' for tabs).