YAML to JSON Converter Online — Free & Private

Paste Docker Compose, Helm values, or Ansible-flavoured YAML and get strict JSON for APIs and CI gates. Single-document only; anchors resolve — BigInt/Date values are rejected for JSON parity.

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YAML → JSON — ops manifests to API payloads
Explains Compose/Kubernetes snippets becoming strict JSON without uploads.

Developer notes

• Anchors merge per js-yaml — ensure resolved graph stays JSON-safe. • Multi-document files error by design — split upstream. • Large files may block the main thread; prefer chunks >512 KiB offline.

When teams pick this route

• CI gates needing JSON Schema validation after hand-written YAML. • Frontend tooling accepting only JSON.parse-friendly configs. • Migrating Helm values into REST patch bodies.

About these options

CSV exports: choose a delimiter (Auto follows locale — semicolon on /fr), RFC-minimal vs always-quoted fields, line endings, and whether to emit a header row. CSV imports: delimiter is auto-detected from the first line (comma, semicolon, tab, or pipe) — toggle whether row 1 holds column names. JSON output (XML, YAML, or CSV sources): indentation (including compact one-line) and optional recursive key sort. JSON → XML: toggle pretty-printing and indent width. YAML output: indent width, readable vs tighter layout, and deterministic string quoting (there is no source YAML file to “preserve”). XML comments are not represented in the intermediate JSON tree.

Worked examples

Tiny service map

Sample input

apiVersion: apps/v1 kind: Deployment metadata: name: checkout-api labels: app: checkout spec: replicas: 3 selector: matchLabels: app: checkout template: metadata: labels: app: checkout spec: containers: - name: api image: registry.example/checkout:2.4.1 ports: - containerPort: 8080

Sample output

{ "apiVersion": "apps/v1", "kind": "Deployment", "metadata": { "name": "checkout-api", "labels": { "app": "checkout" } }, "spec": { "replicas": 3, "selector": { "matchLabels": { "app": "checkout" } }, "template": { "metadata": { "labels": { "app": "checkout" } }, "spec": { "containers": [ { "name": "api", "image": "registry.example/checkout:2.4.1", "ports": [ { "containerPort": 8080 } ] } ] } } } }

List of endpoints

Sample input

service: name: billing-gateway port: 8443 tls: enabled: true minVersion: "1.2" endpoints: - /health - /metrics - /ready

Sample output

{ "service": { "name": "billing-gateway", "port": 8443, "tls": { "enabled": true, "minVersion": "1.2" }, "endpoints": [ "/health", "/metrics", "/ready" ] } }

Navigate related converters

After import, validate with the JSON validator, prettify using the JSON formatter, or browse structure in the JSON tree viewer. Compare YAML → JSON round-trips or export CSV via JSON → CSV.

YAML → JSON FAQ

Single-doc constraint

Multiple `---` documents?

Rejected — paste one stream only.

JavaScript Date objects from YAML timestamps?

Rejected with an explicit error — stringify dates in YAML as strings first.

Compared to kubectl conversions?

FastMinify targets clipboard workflows, not cluster APIs.

Tags & anchors?

Resolved by js-yaml; cycles surface as parse errors.

YAML

Convert YAML to JSON, XML, CSV, TOML, TSV, Properties and INI — cross-target TOML via Properties → TOML and INI → TOML in alsoLinks.

Other converter families

JSON

Convert JSON to YAML, XML, CSV, TOML, TSV, SQL, HTML, Properties and INI — all in your browser.

XML

Convert XML to YAML, CSV, JSON, TOML, TSV and HTML.

CSV

Convert CSV to JSON, XML, YAML, TOML and TSV.

TOML

Convert TOML to JSON, YAML, XML, CSV, Properties and INI.

TSV

Convert tab-separated values to JSON and CSV.

SQL

Parse INSERT statements to JSON and CSV.

HTML

Convert HTML to JSON, XML, YAML and Markdown.

Markdown

Convert Markdown to HTML locally.

Properties

Convert Java .properties files to JSON, YAML, INI and TOML.

INI

Convert INI configs to JSON, YAML, Properties (flat INI only) and TOML.

Explore other tool categories

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

Beautify

Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.

Unminify

Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.

CSS preprocessors

Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.

JSON Tools

Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.

SVG Tools

Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.

DevOps & Infra

Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

CI/CD

GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.

Logs & observability

Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

Networking / IP

CIDR, subnets, and IPv4/IPv6 helpers — in your browser.

Security & tokens

JWKS, X.509 certificates, and secrets scan — browser-local.

API & schemas

OpenAPI tools to format, validate, and lint your specs.

Encoding

Encode or decode Base64, URL components and HTML entities — client-side only.

Developer utilities

Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.

Text & Markdown

Count words, build Markdown TOCs, and clean line lists — all in your browser.

AI & LLM

Token counting, pricing estimates, and context-window fit — 100% browser-local.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.