Convert YAML to JSON Online - Free, Local & Instant
Instant YAML (.yaml) to JSON (.json) converter. 100% client-side processing in your browser RAM — zero file uploads, full privacy, drag & drop or paste raw text.
Technical Comparison: YAML vs JSON
Data & Dev Config| Specification | YAML (Source) | JSON (Target) |
|---|---|---|
| Full Specification | YAML Ain't Markup Language | JavaScript Object Notation |
| File Extension & MIME | .yaml (application/x-yaml) | .json (application/json) |
| Data Typing Model | Rich dynamic typing (scalars, sequences, mappings) | Strict (strings, numbers, booleans, arrays, objects, null) |
| Structure & Hierarchy | Indentation-based nested hierarchy | Deeply nested trees & arrays |
| Comments Support | Supported (# inline and block comments) | Not supported in RFC 8259 (supported via relaxed parser) |
| Primary Ecosystem | Kubernetes manifests, Docker Compose, GitHub Actions, Ansible | REST APIs, web apps, NoSQL document stores, modern configs |
YAML to JSON — Before & After Example
- id: 1
name: Alice Johnson
email: alice@example.com
role: admin
active: true
score: 98.5
address:
city: Berlin
country: DE
- id: 2
name: Bob Smith
email: bob@example.com
role: editor
active: false
score: 87
address:
city: Austin
country: US
- id: 3
name: Chiara Rossi
email: chiara@example.com
role: viewer
active: true
score: 91.25
address:
city: Milan
country: IT
[
{
"id": 1,
"name": "Alice Johnson",
"email": "alice@example.com",
"role": "admin",
"active": true,
"score": 98.5,
"address": {
"city": "Berlin",
"country": "DE"
}
},
{
"id": 2,
"name": "Bob Smith",
"email": "bob@example.com",
"role": "editor",
"active": false,
"score": 87,
"address": {
"city": "Austin",
"country": "US"
}
},
{
"id": 3,
"name": "Chiara Rossi",
"email": "chiara@example.com",
"role": "viewer",
"active": true,
"score": 91.25,
"address": {
"city": "Milan",
"country": "IT"
}
}
]
Frequently Asked Questions: YAML to JSON
How do I convert YAML to JSON online without uploading sensitive files? ▾
Paste your YAML data or drag and drop a .yaml file into the converter above. ZeroUpload parses YAML and serializes JSON 100% inside your browser RAM using local JavaScript—no bytes are ever sent to an external server.
How are nested objects or tabular columns mapped between YAML and JSON? ▾
When converting hierarchical structures (Indentation-based nested hierarchy) and tabular or config formats (Deeply nested trees & arrays), our engine automatically flattens or unflattens dot-separated keys (such as address.city) and preserves numbers, booleans, arrays, and null values.
Is this YAML to JSON converter free for commercial and production config files? ▾
Yes. The tool is completely free, requires no account or API key, and works offline once loaded. Because execution happens in local memory, it is safe for proprietary YAML, database exports, and production secrets.
Can I convert JSON back to YAML? ▾
Yes! Click the "Swap (JSON → YAML)" button at the top of the workspace or use the reverse converter link at the bottom of this page for bidirectional conversion.