Free online JSON tools for developers
Format, validate, compare, and convert structured data in your browser. The tools below run locally in this page.
Popular JSON tools
Start with the common formatting, validation, and conversion tasks.
JSON Formatter
Format JSON with consistent indentation and catch syntax errors before copying it.
JSON Validator
Check JSON syntax and see the parser's line and column when input is invalid.
JSON Minifier
Remove insignificant JSON whitespace while preserving parsed values.
JSON Compare
Compare two JSON values and locate changed paths.
JSON to CSV
Convert an array of objects to CSV with explicit handling for nested values.
CSV to JSON
Parse quoted CSV records into JSON objects using the first row as headers.
Search all JSON tools
Format and validate
JSON Formatter
Format JSON with consistent indentation and catch syntax errors before copying it.
JSON Beautifier
Turn compact JSON into an indented, readable document.
JSON Pretty Print
Print JSON with clear spacing for review and debugging.
JSON Minifier
Remove insignificant JSON whitespace while preserving parsed values.
JSON Editor Online
Edit, format, validate, and inspect JSON in your browser.
JSON Validator
Check JSON syntax and see the parser's line and column when input is invalid.
JSON Formatter and Validator
Validate JSON and format it in one step.
JSON Parser
Parse JSON text and inspect its value and top-level structure.
JSON Checker
Check whether a text value is valid JSON.
JSON Fixer
Review conservative suggestions for common JSON syntax mistakes.
JSON File Reader
Open a local JSON file and inspect or format its contents in this browser.
Explore and compare
JSON Tree Viewer
Expand and collapse nested objects and arrays as a readable tree.
JSON Visualizer
Explore JSON hierarchy, types, and collection sizes.
JSON Schema Validator
Validate data against a clearly scoped JSON Schema subset (Draft 2020-12 core types and common constraints).
JSON Schema Generator
Infer a conservative schema from a JSON sample and review optional-field limitations.
JSON Compare
Compare two JSON values and locate changed paths.
JSON Diff
Review additions, removals, and changes between parsed JSON values.
JSON Comparison
Compare nested JSON data without relying on property order.
Strings and syntax
JSON Stringify
Convert a JSON value to a JSON string, with optional indentation.
JSON Escape
Escape text for safe inclusion as a JSON string value.
JSON Unescape
Decode a JSON-escaped string using the standard JSON parser.
JSON Comments Helper
Identify comment syntax and preview a conservative comment-removal suggestion.
JSON String to Object Parser
Parse a quoted JSON string and then parse the JSON text it contains.
Convert data
JSON to CSV
Convert an array of objects to CSV with explicit handling for nested values.
CSV to JSON
Parse quoted CSV records into JSON objects using the first row as headers.
JSON to YAML
Convert JSON to a readable YAML subset with safe scalar quoting.
XML to JSON
Convert an XML document to a JSON representation while preserving repeated elements.
JSON to TypeScript
Infer TypeScript types from JSON values; review assumptions about missing fields.
JSON Array to CSV
Convert a JSON array into CSV, including scalar arrays as a single value column.
Nested JSON to CSV
Flatten nested object paths and preserve nested arrays as JSON text for CSV export.
JSONL to JSON
Parse one JSON value per non-empty line and return a JSON array with line-specific errors.
JSON to JSONL
Write each top-level array item as one compact JSON line.
Create and learn
JSON Generator
Create a JSON object from a simple field list and review the generated types.
Dummy JSON Generator
Generate small, editable sample datasets for local testing.
JSON Example Explorer
Browse practical JSON examples and load one into the editor.
JSON Structure Explorer
Inspect object keys, array lengths, and value types in a JSON sample.
JSON-LD Validator and Previewer
Parse JSON-LD and inspect its context and common structured-data fields; this is not Google's Rich Results Test.
JSON guides
Practical guides for formatting, validation, conversion, and working with JSON data.
JSON Formatter Online: How to Format and Beautify JSON Correctly
Learn how a JSON formatter changes whitespace without changing data, how to read parser errors, and how to format large or nested documents safely.
JSON Validator Guide: How to Find and Fix Syntax Errors
A practical method for locating JSON syntax errors, understanding parser messages, and correcting malformed data without losing content.
How to Convert JSON to CSV Online
Convert arrays of JSON records into CSV, understand headers and quoting, and decide how nested values should be represented.
How to Convert Nested JSON to CSV Without Losing Important Data
Choose a flattening, JSON-cell, or row-expansion strategy for nested JSON, and understand where CSV conversion becomes lossy.
How to Convert CSV to JSON Correctly
Parse CSV records safely, use headers consistently, preserve quoted commas and newlines, and decide whether output values remain strings.
How to Work With Large JSON Files Safely
Plan for memory, parsing, validation, and inspection when handling large JSON documents, and choose streaming or chunking when a full parse is too costly.
Privacy and practical limits
Inputs are handled by JavaScript in your current browser page. They are not placed in a URL or sent to a conversion service. Avoid pasting secrets into any online tool. Some conversions, especially from nested JSON to CSV, require choices because CSV is a flat table format.
JSON Schema and JSON-LD pages explain which checks are supported and which standards features they do not cover. Review output before using it in production.