Free JSON Formatter, Validator & Converter Online
Free online JSON tools for formatting, validating, converting, and debugging JSON. Format JSON, validate syntax, diff two documents, convert JSON to CSV, YAML, XML, TypeScript, and more. All tools run in your browser.
Built for developers, by a developer.
All tools run locally in your browser. Your data never leaves your device.
Common JSON Developer Workflow
Why this collection exists
Work with JSON faster using free browser-based tools for formatting, validating, diffing, converting, and debugging. Whether you are inspecting an API response, converting a JSON schema to typed interfaces, or transforming data between formats, every tool runs locally in your browser with no uploads required.
JSON Tools groups the full JSON workflow in one place — from raw input formatting to typed code generation and cross-format exports. Developers, data engineers, and API builders use this collection to avoid switching between terminals, IDE plugins, and scattered online utilities.
Best fit for
- Backend and frontend developers
- API builders and debuggers
- Data engineers and analysts
- TypeScript developers generating interfaces
- QA testers inspecting API payloads
- Students learning JSON and APIs
Featured tools in this collection
Start with the strongest tools in this workflow cluster.
JSON Formatter
Format, validate, and beautify JSON instantly — with clear error messages, Tree View, Diff mode, and Schema validation.
JSON Validator
Validate JSON syntax online. Shows valid/invalid status, error location (line and column), and structure stats including type, key count, and depth.
JSON Diff
Compare two JSON objects side by side. Highlights added, removed, and unchanged lines after normalising formatting.
JSON Path Tester
Test JSONPath expressions against your JSON.
JSON Tree Viewer
Visualize JSON data in an interactive tree structure.
JSON to TypeScript Interface
Convert any JSON object into TypeScript interfaces instantly — handles nested objects, arrays, union types, optional fields, and generics.
Common JSON Developer Workflow
A practical path from raw API response to typed code or structured data export.
Tools by Workflow
Browse tools grouped by what you need to get done.
Format, Validate & Fix
Start here when you have raw, minified, or broken JSON. Format for readability, validate for errors, auto-fix common mistakes, and remove unwanted fields.
JSON Formatter
Format, validate, and beautify JSON instantly — with clear error messages, Tree View, Diff mode, and Schema validation.
JSON Validator
Validate JSON syntax online. Shows valid/invalid status, error location (line and column), and structure stats including type, key count, and depth.
JSON Fixer
Fix broken or invalid JSON automatically. Repairs trailing commas, single quotes, bare keys, Python literals, and JavaScript comments.
JSON Cleaner
Clean JSON by removing null values, empty strings, empty arrays, and empty objects. Configurable per value type with a removal count stat.
JSON Diff
Compare two JSON objects side by side. Highlights added, removed, and unchanged lines after normalising formatting.
JSON Editor
Edit JSON in a textarea with an interactive tree view, formatting controls, key sorting, and instant validation. Copy or download the result.
JSON5 Validator
Validate JSON5 syntax online — supports single-line and multi-line comments, trailing commas, single-quoted strings, unquoted keys, and hexadecimal numbers.
Inspect & Navigate
Explore deeply nested JSON, test JSONPath expressions, sort keys, and navigate complex structures interactively without writing any code.
JSON Tree Viewer
Visualize JSON data in an interactive tree structure.
JSON Path Tester
Test JSONPath expressions against your JSON.
JSON Navigator
Browse JSON as a collapsible tree, select any node, and copy its JSONPath. Shows the type and size of each branch — ideal for exploring large API responses.
JSON Sorter
Sort JSON object keys alphabetically in ascending or descending order, with deep or shallow sorting and optional array sorting.
JSON Syntax Highlighting
Format JSON and generate escaped syntax-highlighted HTML with light or dark themes and optional line numbers.
JSON Cheat Sheet
A complete JSON reference — data types, syntax rules, nested structures, common patterns, and gotchas. Quick lookup for developers working with JSON APIs and configs.
Convert JSON to Code
Generate typed interfaces, data classes, and model definitions from JSON schemas and API response shapes for your target language.
JSON to TypeScript Interface
Convert any JSON object into TypeScript interfaces instantly — handles nested objects, arrays, union types, optional fields, and generics.
JSON to Python Converter
Generate Python classes from a JSON example. Choose @dataclass, pydantic BaseModel, TypedDict, or attrs style. Targets Python 3.10+ or 3.9 type syntax.
JSON to Java Converter
Generate Java POJO classes from a JSON example. Infers types, creates nested classes, handles arrays as List<T>, and optionally uses Lombok @Data or full getters/setters.
JSON to C# Converter
Generate C# classes from a JSON example. Infers types, creates nested classes, handles arrays as List<T>, and optionally emits [JsonPropertyName] attributes for System.Text.Json.
JSON to Go Struct Converter
Generate Go structs from a JSON example. Infers types, creates nested structs, handles arrays as slices, and emits json:"..." struct tags ready for encoding/json.
JSON to Dart Converter
Generate Dart classes from a JSON example. Includes nullable fields, fromJson factory constructors, and toJson methods for use with Flutter and Dart serialization.
JSON to JavaScript Converter
Convert JSON to a JavaScript object literal — bare expression, const variable, ES module, CommonJS export, or IIFE. Unquoted identifier keys when valid, single or double quoted strings.
JSON to PHP Array Converter
Convert JSON to a PHP array literal — short [ ] or long array( ) syntax, configurable indent, optional variable assignment, and proper string escaping.
JSON to Proto Converter
Generate a Protocol Buffers (proto3) schema from an example JSON object. Infers field types, creates nested messages, and handles arrays as repeated fields.
JSON to JSON Schema Generator
Generate a JSON Schema from a JSON example. Infers types and required fields, merges schemas across array items, and targets Draft-07 or Draft 2020-12.
Convert JSON to Data Formats
Transform JSON into spreadsheet, markup, and data interchange formats for sharing, storage, reporting, or pipeline processing.
JSON to CSV Converter
Convert a JSON array of objects to CSV. Flattens nested objects with dot-notation columns and handles arrays within values.
JSON to XML Converter
Convert JSON to XML online. Nested objects and arrays are mapped to XML elements with configurable root element name and optional XML declaration.
JSON to YAML
Convert JSON to YAML format instantly. Validates JSON before converting and produces clean, indented YAML output.
JSON to Excel Converter
Convert JSON arrays or objects into an Excel-compatible spreadsheet download or CSV file.
JSON to HTML Converter
Convert JSON to an HTML table, nested list, or cards. Auto-detects arrays of objects and renders a column-per-key table. Includes optional inline styles.
JSON to TOML Converter
Convert JSON to TOML 1.0 — table headers for nested objects, [[array of tables]] for arrays of objects, inline tables for short structures, and proper key quoting.
JSON to TSV Converter
Convert a JSON array of objects into Tab-Separated Values (TSV). Auto-detects columns across all rows, escapes tabs and newlines, and optionally flattens nested objects.
JSON to JSON Lines Converter
Convert a JSON array (or object) into JSON Lines (JSONL/ndjson) format — one JSON value per line, ready for streaming and log pipelines.
Import from Other Formats
Convert CSV, XML, YAML, HTML, and Excel into JSON for use in applications, APIs, and data pipelines.
CSV to JSON Converter
Convert CSV files to JSON arrays instantly — with header mapping, delimiter options, and type inference.
XML to JSON Converter
Parse and convert XML to clean JSON instantly — attributes, namespaces, and nested elements handled.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML — for config files, CI pipelines, and Kubernetes manifests.
HTML to JSON Converter
Convert HTML tables, lists, or DOM trees to JSON. Extracts structured data from HTML without writing a parser.
Excel to JSON Converter
Convert Excel, CSV, TSV, or pasted spreadsheet rows into JSON records with header-based keys.
TOML to JSON Converter
Convert TOML configuration files to JSON format. Supports tables, arrays, inline tables, multi-line strings, and all TOML data types.
Encode, Decode & Utilities
Stringify, parse, escape, URL-encode, and generate JSON for development and testing workflows.
JSON Stringify Online
Stringify JSON with full control over indentation, key sorting, Unicode escaping, and JS-call wrapping. Mirrors JSON.stringify with extra options. Copy the formatted result.
JSON Encode Online
Escape a string for use as a JSON value. Handles quotes, backslashes, control characters, and optionally Unicode and forward slashes. Copy the ready-to-paste JSON string.
JSON Decode Online
Decode a JSON-escaped string back to plain text. Unescapes quotes, backslashes, newlines, and Unicode \uXXXX sequences. Works with or without surrounding quotes.
JSON Escape / Unescape
Escape strings for use inside JSON values or unescape JSON-encoded strings back to readable text.
JSON URL Encode
URL-encode JSON for use in query strings or POST bodies. Supports encodeURIComponent, encodeURI, and form (x-www-form-urlencoded) modes. Optional minify-before-encode.
JSON URL Decode
URL-decode JSON from query strings or form bodies. Optionally treats + as space (form mode) and pretty-prints the resulting JSON.
JSON to Base64 Converter
Convert valid JSON into Base64 encoding with syntax validation and copy-ready output.
Base64 to JSON Converter
Convert Base64 strings into formatted JSON with validation and copy-ready output.
JSONify String
Encode any raw string into a JSON string literal — escaping double-quotes, backslashes, newlines, tabs, and all other special characters required by the JSON spec.
Unstringify JSON
Decode a JSON string literal back to its original JSON structure. Handles single and double-stringified JSON — including cases where a full JSON object has been wrapped as a string value.
JSON Multiline String
Escape multiline text into a valid JSON string value, or unescape a JSON string back to readable text. Handles newlines, tabs, quotes, and backslashes.
Random JSON Generator
Generate random JSON data with realistic user records. Choose the number of records and download or copy the output.
Browse the supporting categories
Jump into the broader categories that power this collection.
All tools in this collection
Browse the complete workflow cluster and jump into the tool you need next.
JSON Formatter
Format, validate, and beautify JSON instantly — with clear error messages, Tree View, Diff mode, and Schema validation.
JSON Validator
Validate JSON syntax online. Shows valid/invalid status, error location (line and column), and structure stats including type, key count, and depth.
JSON Diff
Compare two JSON objects side by side. Highlights added, removed, and unchanged lines after normalising formatting.
JSON Editor
Edit JSON in a textarea with an interactive tree view, formatting controls, key sorting, and instant validation. Copy or download the result.
JSON Path Tester
Test JSONPath expressions against your JSON.
JSON Tree Viewer
Visualize JSON data in an interactive tree structure.
JSON Fixer
Fix broken or invalid JSON automatically. Repairs trailing commas, single quotes, bare keys, Python literals, and JavaScript comments.
JSON Cleaner
Clean JSON by removing null values, empty strings, empty arrays, and empty objects. Configurable per value type with a removal count stat.
JSON Sorter
Sort JSON object keys alphabetically in ascending or descending order, with deep or shallow sorting and optional array sorting.
JSON Navigator
Browse JSON as a collapsible tree, select any node, and copy its JSONPath. Shows the type and size of each branch — ideal for exploring large API responses.
JSON5 Validator
Validate JSON5 syntax online — supports single-line and multi-line comments, trailing commas, single-quoted strings, unquoted keys, and hexadecimal numbers.
JSON Syntax Highlighting
Format JSON and generate escaped syntax-highlighted HTML with light or dark themes and optional line numbers.
JSON Escape / Unescape
Escape strings for use inside JSON values or unescape JSON-encoded strings back to readable text.
JSON Stringify Online
Stringify JSON with full control over indentation, key sorting, Unicode escaping, and JS-call wrapping. Mirrors JSON.stringify with extra options. Copy the formatted result.
JSON URL Encode
URL-encode JSON for use in query strings or POST bodies. Supports encodeURIComponent, encodeURI, and form (x-www-form-urlencoded) modes. Optional minify-before-encode.
JSON URL Decode
URL-decode JSON from query strings or form bodies. Optionally treats + as space (form mode) and pretty-prints the resulting JSON.
JSON Encode Online
Escape a string for use as a JSON value. Handles quotes, backslashes, control characters, and optionally Unicode and forward slashes. Copy the ready-to-paste JSON string.
JSON Decode Online
Decode a JSON-escaped string back to plain text. Unescapes quotes, backslashes, newlines, and Unicode \uXXXX sequences. Works with or without surrounding quotes.
JSON Multiline String
Escape multiline text into a valid JSON string value, or unescape a JSON string back to readable text. Handles newlines, tabs, quotes, and backslashes.
JSONify String
Encode any raw string into a JSON string literal — escaping double-quotes, backslashes, newlines, tabs, and all other special characters required by the JSON spec.
Unstringify JSON
Decode a JSON string literal back to its original JSON structure. Handles single and double-stringified JSON — including cases where a full JSON object has been wrapped as a string value.
JSON Parser Online
Parse JSON in your browser and explore the result as an interactive collapsible tree. Reports parse errors with line and column, plus a per-type element count and depth.
Random JSON Generator
Generate random JSON data with realistic user records. Choose the number of records and download or copy the output.
JSON Cheat Sheet
A complete JSON reference — data types, syntax rules, nested structures, common patterns, and gotchas. Quick lookup for developers working with JSON APIs and configs.
JSON to TypeScript Interface
Convert any JSON object into TypeScript interfaces instantly — handles nested objects, arrays, union types, optional fields, and generics.
JSON to Python Converter
Generate Python classes from a JSON example. Choose @dataclass, pydantic BaseModel, TypedDict, or attrs style. Targets Python 3.10+ or 3.9 type syntax.
JSON to Java Converter
Generate Java POJO classes from a JSON example. Infers types, creates nested classes, handles arrays as List<T>, and optionally uses Lombok @Data or full getters/setters.
JSON to C# Converter
Generate C# classes from a JSON example. Infers types, creates nested classes, handles arrays as List<T>, and optionally emits [JsonPropertyName] attributes for System.Text.Json.
JSON to Go Struct Converter
Generate Go structs from a JSON example. Infers types, creates nested structs, handles arrays as slices, and emits json:"..." struct tags ready for encoding/json.
JSON to Dart Converter
Generate Dart classes from a JSON example. Includes nullable fields, fromJson factory constructors, and toJson methods for use with Flutter and Dart serialization.
JSON to JavaScript Converter
Convert JSON to a JavaScript object literal — bare expression, const variable, ES module, CommonJS export, or IIFE. Unquoted identifier keys when valid, single or double quoted strings.
JSON to PHP Array Converter
Convert JSON to a PHP array literal — short [ ] or long array( ) syntax, configurable indent, optional variable assignment, and proper string escaping.
JSON to Proto Converter
Generate a Protocol Buffers (proto3) schema from an example JSON object. Infers field types, creates nested messages, and handles arrays as repeated fields.
JSON to JSON Schema Generator
Generate a JSON Schema from a JSON example. Infers types and required fields, merges schemas across array items, and targets Draft-07 or Draft 2020-12.
JSON to CSV Converter
Convert a JSON array of objects to CSV. Flattens nested objects with dot-notation columns and handles arrays within values.
JSON to XML Converter
Convert JSON to XML online. Nested objects and arrays are mapped to XML elements with configurable root element name and optional XML declaration.
JSON to YAML
Convert JSON to YAML format instantly. Validates JSON before converting and produces clean, indented YAML output.
JSON to Excel Converter
Convert JSON arrays or objects into an Excel-compatible spreadsheet download or CSV file.
JSON to HTML Converter
Convert JSON to an HTML table, nested list, or cards. Auto-detects arrays of objects and renders a column-per-key table. Includes optional inline styles.
JSON to TOML Converter
Convert JSON to TOML 1.0 — table headers for nested objects, [[array of tables]] for arrays of objects, inline tables for short structures, and proper key quoting.
JSON to TSV Converter
Convert a JSON array of objects into Tab-Separated Values (TSV). Auto-detects columns across all rows, escapes tabs and newlines, and optionally flattens nested objects.
JSON to JSON Lines Converter
Convert a JSON array (or object) into JSON Lines (JSONL/ndjson) format — one JSON value per line, ready for streaming and log pipelines.
JSON to String Converter
Convert a JSON object or value into a JSON-encoded string literal — escaping all inner quotes and special characters so it can be embedded as a string value inside another JSON document.
JSON to Text Converter
Extract all text values from a JSON document as plain text — one value per line. Optionally include keys, numbers, and booleans.
JSON to Base64 Converter
Convert valid JSON into Base64 encoding with syntax validation and copy-ready output.
JSON to One Line
Compress a formatted JSON object into a single line by removing all whitespace and line breaks. Shows byte savings.
CSV to JSON Converter
Convert CSV files to JSON arrays instantly — with header mapping, delimiter options, and type inference.
XML to JSON Converter
Parse and convert XML to clean JSON instantly — attributes, namespaces, and nested elements handled.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML — for config files, CI pipelines, and Kubernetes manifests.
HTML to JSON Converter
Convert HTML tables, lists, or DOM trees to JSON. Extracts structured data from HTML without writing a parser.
Excel to JSON Converter
Convert Excel, CSV, TSV, or pasted spreadsheet rows into JSON records with header-based keys.
TOML to JSON Converter
Convert TOML configuration files to JSON format. Supports tables, arrays, inline tables, multi-line strings, and all TOML data types.
Base64 to JSON Converter
Convert Base64 strings into formatted JSON with validation and copy-ready output.
Collection FAQ
Extra context around when to use this toolkit and where to start.
What is a JSON formatter?
A JSON formatter takes raw or minified JSON and adds indentation, line breaks, and consistent spacing to make it human-readable. It is the first step when inspecting an API response, debugging a configuration file, or reviewing data from any JSON source.
How do I validate JSON online?
Paste your JSON into JSON Validator and it immediately flags syntax errors including missing commas, unquoted keys, trailing commas, and bracket mismatches. JSON5 Validator supports the JSON5 extension which allows comments and trailing commas.
What is the difference between JSON Formatter and JSON Editor?
JSON Formatter is a read and inspect tool — it formats and validates JSON for review. JSON Editor lets you modify the structure interactively by adding, removing, or editing keys and values. Use Formatter to read, Editor to change.
How do I convert JSON to TypeScript interfaces?
Use JSON to TypeScript Converter. Paste a JSON object or array and it generates typed TypeScript interfaces matching the exact structure, including nested objects and arrays. Useful when building type-safe API client code from a response schema.
What is JSONPath and how do I test it?
JSONPath is a query syntax for extracting values from JSON, similar to XPath for XML. JSON Path Tester lets you paste any JSON document and run JSONPath expressions to see matching results instantly. Useful when writing queries for APIs or data pipelines.
How do I compare two JSON objects?
JSON Diff shows the structural difference between two JSON documents side by side, highlighting added, removed, and changed keys. Use it to spot what changed between two API responses, config files, or data snapshots.
Are these JSON tools safe to use with API data?
Yes. All JSON tools on WebToolsPlanet run entirely in your browser — your data is never sent to a server. Avoid pasting production tokens, credentials, private keys, or customer PII into any online tool.
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