Free Tool

Free Online YAML to JSON Converter

Convert your YAML configuration files and data into clean JSON format instantly. Paste any YAML and get formatted JSON output. Supports anchors, aliases, nested structures, and multiple document streams. No uploads, no servers, 100% private.

Instant ConversionAnchor & Alias SupportNested Structure SupportCopy & Download

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YAML to JSONValid

YAML Input

JSON Output

2"server":{

3"host":"0.0.0.0",

4"port":8080,

5"ssl":true,

6"cors":{

7 "enabled":true,

8 "origins":[

9 "https://example.com",

10 "https://app.example.com"

11 ]

12}

13},

14"database":{

15"host":"localhost",

16"port":5432,

17"name":"myapp",

18"credentials":{

19 "username":"admin",

20 "password":"secret123"

21},

22"pool":{

23 "min":2,

24 "max":10

25}

26},

27"features":[

28{

29 "name":"User Authentication",

30 "enabled":true,

31 "config":{

32 "jwt_secret":"your-secret-key",

33 "token_expiry":3600

34 }

35},

36{

37 "name":"Rate Limiting",

38 "enabled":true,

39 "config":{

40 "requests_per_minute":100,

41 "burst_size":20

42 }

43}

44],

45"logging":{

46"level":"debug",

47"format":"json",

48"outputs":[

49 {

50 "type":"console"

51 },

52 {

53 "type":"file",

54 "path":"/var/log/app.log"

55 }

56]

57}

58}

Chars: 682Lines: 58

How to Use

How to Use the YAML to JSON Converter

Paste Your YAML

Copy your YAML data from any source — configuration files, Docker Compose, Kubernetes manifests, or API specs. Paste it into the input editor.

Auto-Convert Instantly

The tool automatically converts your YAML to JSON in real-time. Nested objects, arrays, anchors, and aliases are all handled seamlessly.

Copy or Download

Copy the formatted JSON to your clipboard or download it as a .json file. Ready to use in your applications, APIs, or data pipelines.

Features

Powerful YAML to JSON Conversion Features

Everything you need to convert YAML to JSON — all in one free tool.

⚡

Instant Conversion

See your YAML converted to JSON in real-time as you type or paste. No buttons to click — just paste and go.

🔗

Anchor & Alias Support

YAML anchors (&) and aliases (*) are fully resolved. Reused nodes are expanded correctly in the JSON output.

📂

Nested Structure Support

Deeply nested YAML objects and arrays are converted to equivalent JSON structures. Complex documents are preserved accurately.

📄

Multiple Document Streams

YAML files with multiple documents separated by `---` are handled and each document is converted independently.

🎨

Syntax Highlighting

Color-coded JSON output with keys, strings, numbers, and booleans highlighted for easy reading and verification.

📋

Copy to Clipboard

Copy the formatted JSON output to your clipboard with a single click. Ready to paste into your code or documentation.

💾

Download as File

Download your converted JSON as a .json file. Perfect for saving for use in applications and data pipelines.

🔒

100% Client-Side

All processing happens in your browser. Your data never leaves your device — no uploads, no servers, no privacy concerns.

Why This Tool

Why Use Our YAML to JSON Converter

The simplest, fastest way to convert YAML to JSON online. No sign-up, no limits, no data leaving your browser.

100% Free

No hidden fees, no premium plans, no usage limits. Convert as much YAML as you need, as often as you want.

Privacy First

Your data never leaves your browser. Everything is processed locally — no server uploads, no data logging.

Anchor Resolution

YAML anchors and aliases are fully resolved, preserving complex shared references in your configuration files.

Developer-Friendly

Clean, formatted JSON output with syntax highlighting. Perfect for working with Docker Compose, Kubernetes, CI/CD configs, and API specs.

Key Highlights

No sign-up or registration required
Processes everything in your browser — zero server uploads
Supports YAML anchors (&) and aliases (*)
Handles nested objects, arrays, and multiple documents
Based on the popular js-yaml library
Works on any device — desktop, tablet, or mobile

FAQ

Frequently asked questions

What is a YAML to JSON converter?

A YAML to JSON converter transforms YAML (YAML Ain't Markup Language) data into JSON (JavaScript Object Notation) format. YAML is commonly used for configuration files (Docker Compose, Kubernetes, CI/CD pipelines) while JSON is the standard for web APIs and JavaScript applications.

Is this YAML to JSON converter really free?

Yes, completely free. There are no hidden charges, no usage limits, and no premium features locked behind a paywall. Use it as much as you need, whenever you need it.

Is my data secure?

Absolutely. All conversion happens entirely in your browser using JavaScript. Your data is never sent to any server, stored, or logged. This means sensitive configuration data stays completely private.

Does it support YAML anchors and aliases?

Yes! YAML anchors (&) and aliases (*) are fully supported. When you define an anchor like `&defaults` and reference it with `*defaults`, the converter resolves the reference and expands it in the JSON output.

Can it handle multiple YAML documents?

Yes. If your YAML file contains multiple documents separated by `---`, the converter will handle each document independently. If there are multiple documents, they will be returned as an array.

What YAML features are supported?

The converter supports all standard YAML 1.2 features including: nested objects and arrays, inline JSON-style syntax, multi-line strings (literal and folded blocks), anchors and aliases, tags, boolean and numeric types, null values, and comments.

Can it handle large YAML files?

Our tool can handle YAML data up to approximately 10MB in size. For larger files, your browser may experience performance issues since everything is processed client-side. For typical use cases like config files and API specs, performance is instantaneous.

Do I need to install anything?

No installation required. The YAML to JSON converter works entirely in your web browser. Just open the page and start converting. No downloads, no plugins, no setup.

Can I use this on my phone?

Yes, the tool is fully responsive and works on all devices — desktops, tablets, and smartphones. The interface adapts to your screen size for comfortable use anywhere.