Free YAML Formatter, Validator & YAML to JSON Converter Online
Free YAML tools to beautify, validate, parse, and convert YAML to JSON, CSV, XML, Excel, and code. Includes a YAML cheat sheet and TOML converter.
Built for developers, by a developer.
All tools run locally in your browser. Your data never leaves your device.
In This Collection
YAML Beautifier
YAML Validator
YAML to JSON Converter
JSON to YAML
YAML to CSV Converter
Why this collection exists
Work with YAML configuration files and data in your browser. Beautify, validate, and parse YAML, convert it to JSON or CSV, generate code from YAML data, and reference the cheat sheet when you forget the syntax.
YAML is the standard format for Kubernetes configs, Docker Compose files, GitHub Actions, and most modern CI/CD pipelines. These tools let you edit and transform YAML without installing anything locally.
Best fit for
- DevOps engineers working with Kubernetes and Docker
- Backend developers configuring CI/CD pipelines
- Data engineers converting YAML data files
- Frontend developers using YAML for site configuration
Featured tools in this collection
Start with the strongest tools in this workflow cluster.
YAML Beautifier
Format and prettify YAML with configurable indentation and optional key sorting. Validates YAML syntax instantly.
YAML Validator
Validate YAML syntax online. Shows valid/invalid status with exact error line and column, plus structure stats for valid documents.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML — for config files, CI pipelines, and Kubernetes manifests.
JSON to YAML
Convert JSON to YAML format instantly. Validates JSON before converting and produces clean, indented YAML output.
YAML to CSV Converter
Convert a YAML array of objects to CSV. Flattens nested keys with dot notation, picks delimiter (comma, semicolon, tab), controls quoting and header row.
YAML Parser Online
Parse and validate YAML online. Shows a collapsible tree view, format statistics (objects, arrays, strings, depth), and formatted YAML output. Highlights parse errors with messages.
Tools by Workflow
Browse tools grouped by what you need to get done.
Format & Validate
Beautify, validate, parse, and pretty-print YAML documents.
YAML Beautifier
Format and prettify YAML with configurable indentation and optional key sorting. Validates YAML syntax instantly.
YAML Validator
Validate YAML syntax online. Shows valid/invalid status with exact error line and column, plus structure stats for valid documents.
YAML Parser Online
Parse and validate YAML online. Shows a collapsible tree view, format statistics (objects, arrays, strings, depth), and formatted YAML output. Highlights parse errors with messages.
YAML Pretty Print
Format and pretty-print YAML with clean indentation, optional key sorting, and configurable line width. Validates syntax and normalizes whitespace instantly.
YAML Converter
Convert YAML to JSON, XML, CSV, or TOML from a single tool. Paste YAML once and switch between output formats instantly.
YAML Cheat Sheet
A complete YAML reference — scalars, sequences, mappings, multi-line strings, anchors, aliases, and gotchas. Quick lookup for developers working with YAML configs.
Convert YAML
Convert YAML to JSON, CSV, XML, Excel, and Base64.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML — for config files, CI pipelines, and Kubernetes manifests.
YAML to CSV Converter
Convert a YAML array of objects to CSV. Flattens nested keys with dot notation, picks delimiter (comma, semicolon, tab), controls quoting and header row.
YAML to XML Converter
Convert YAML to XML online. Supports nested objects, arrays, and custom root element names with optional XML declaration.
YAML to Excel Converter
Convert YAML to an Excel spreadsheet. Flattens YAML arrays of objects into rows with header columns. Download as .xls or export as CSV.
YAML to Base64
Validate YAML and encode it to Base64 with optional URL-safe output, stats, copy, and download.
Convert to YAML
Convert JSON, XML, CSV, and other formats to YAML.
JSON to YAML
Convert JSON to YAML format instantly. Validates JSON before converting and produces clean, indented YAML output.
XML to YAML Converter
Convert XML to YAML. Parses XML with the browser DOMParser, maps element names to YAML keys, handles attributes (@prefix), and serializes repeating siblings as YAML sequences.
YAML to Code
Generate C#, Java, Python, Go, TypeScript, and Dart classes from YAML data.
YAML to C# Converter
Generate C# classes from a YAML example. Supports PascalCase property names, JSON property attributes, nullable types, namespaces, and List<T> for arrays.
YAML to Python Converter
Generate Python classes from a YAML example. Pick @dataclass, pydantic, TypedDict, or attrs style. Targets Python 3.10+ or 3.9 type syntax.
YAML to Go Struct Converter
Generate Go structs from a YAML example. Infers types, creates nested structs, handles arrays as slices, and emits json:"..." tags ready for encoding/json or yaml.v3.
YAML to JavaScript Converter
Convert YAML to a JavaScript object literal — choose const, ES module export, CommonJS, IIFE, or bare expression style. Parses YAML to JSON internally, then generates idiomatic JS.
YAML to TypeScript Converter
Generate TypeScript interfaces from a YAML example. Parses YAML to JSON internally, then emits typed interfaces with nested types and array element inference.
YAML to Dart Converter
Generate Dart classes from a YAML example. Supports nullable types, final fields, fromJson/toJson factories, and nested class generation for mappings.
YAML to Objective-C Converter
Generate Objective-C model classes from a YAML example. Produces @interface / @implementation with NSString, NSNumber, NSArray, and nested class properties.
YAML to JSON Schema Converter
Generate a JSON Schema from a YAML document. Infers types, object properties, arrays, and nested schemas. Supports JSON Schema Draft 07 and 2020-12.
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.
YAML Beautifier
Format and prettify YAML with configurable indentation and optional key sorting. Validates YAML syntax instantly.
YAML Validator
Validate YAML syntax online. Shows valid/invalid status with exact error line and column, plus structure stats for valid documents.
YAML Parser Online
Parse and validate YAML online. Shows a collapsible tree view, format statistics (objects, arrays, strings, depth), and formatted YAML output. Highlights parse errors with messages.
YAML Pretty Print
Format and pretty-print YAML with clean indentation, optional key sorting, and configurable line width. Validates syntax and normalizes whitespace instantly.
YAML Converter
Convert YAML to JSON, XML, CSV, or TOML from a single tool. Paste YAML once and switch between output formats instantly.
YAML Cheat Sheet
A complete YAML reference — scalars, sequences, mappings, multi-line strings, anchors, aliases, and gotchas. Quick lookup for developers working with YAML configs.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML — for config files, CI pipelines, and Kubernetes manifests.
YAML to CSV Converter
Convert a YAML array of objects to CSV. Flattens nested keys with dot notation, picks delimiter (comma, semicolon, tab), controls quoting and header row.
YAML to XML Converter
Convert YAML to XML online. Supports nested objects, arrays, and custom root element names with optional XML declaration.
YAML to Excel Converter
Convert YAML to an Excel spreadsheet. Flattens YAML arrays of objects into rows with header columns. Download as .xls or export as CSV.
YAML to Base64
Validate YAML and encode it to Base64 with optional URL-safe output, stats, copy, and download.
YAML to C# Converter
Generate C# classes from a YAML example. Supports PascalCase property names, JSON property attributes, nullable types, namespaces, and List<T> for arrays.
YAML to Python Converter
Generate Python classes from a YAML example. Pick @dataclass, pydantic, TypedDict, or attrs style. Targets Python 3.10+ or 3.9 type syntax.
YAML to Go Struct Converter
Generate Go structs from a YAML example. Infers types, creates nested structs, handles arrays as slices, and emits json:"..." tags ready for encoding/json or yaml.v3.
YAML to JavaScript Converter
Convert YAML to a JavaScript object literal — choose const, ES module export, CommonJS, IIFE, or bare expression style. Parses YAML to JSON internally, then generates idiomatic JS.
YAML to TypeScript Converter
Generate TypeScript interfaces from a YAML example. Parses YAML to JSON internally, then emits typed interfaces with nested types and array element inference.
YAML to Dart Converter
Generate Dart classes from a YAML example. Supports nullable types, final fields, fromJson/toJson factories, and nested class generation for mappings.
YAML to Objective-C Converter
Generate Objective-C model classes from a YAML example. Produces @interface / @implementation with NSString, NSNumber, NSArray, and nested class properties.
YAML to JSON Schema Converter
Generate a JSON Schema from a YAML document. Infers types, object properties, arrays, and nested schemas. Supports JSON Schema Draft 07 and 2020-12.
JSON to YAML
Convert JSON to YAML format instantly. Validates JSON before converting and produces clean, indented YAML output.
XML to YAML Converter
Convert XML to YAML. Parses XML with the browser DOMParser, maps element names to YAML keys, handles attributes (@prefix), and serializes repeating siblings as YAML sequences.
Collection FAQ
Extra context around when to use this toolkit and where to start.
How do I format YAML online?
Use YAML Beautifier. Paste any YAML document and it re-indents and normalises the structure with consistent two-space indentation. It also flags syntax errors so you can fix them before using the file.
How do I convert YAML to JSON?
Use YAML to JSON Converter. Paste your YAML and it produces an equivalent JSON object. This is useful when an API or tool requires JSON but your config is in YAML format, or when you want to inspect YAML data in a JSON editor.
How do I validate a YAML file online?
Use YAML Validator. Paste your YAML and it checks for indentation errors, duplicate keys, invalid characters, and structural issues. It highlights the exact line where each error occurs.
What is the difference between YAML and JSON?
YAML is a superset of JSON designed for human readability — it uses indentation instead of braces and supports comments. JSON is a strict subset with no comments, suited for machine-to-machine communication. YAML is common for config files (Kubernetes, GitHub Actions, Docker Compose). JSON is common for APIs and data exchange.
How do I convert JSON back to YAML?
Use JSON to YAML Converter. Paste any valid JSON object and it outputs equivalent YAML with proper indentation. Keys, nested objects, and arrays are all preserved.
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