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Data helper

JSON ⇔ YAML Converter

Convert JSON and YAML in both directions by simply pasting your data.
Switch between JSON to YAML and YAML to JSON instantly and view formatted results in real time.

This tool provides immediate feedback when formatting errors occur, helping you quickly identify syntax issues in configuration files or API payloads.
Converted results can be copied with a single click, making it easy to reuse them
in development, deployment, or documentation workflows.

All conversions are performed directly in your browser.
No input data is sent to any server, ensuring a fast and secure experience
for developers working with configuration files and structured data.

Guide: How to use & features

  • Paste JSON on the left or YAML on the right, then click the corresponding convert button.
  • If parsing fails, the status message turns red and shows the error details.
  • Swap inputs or clear both panels to iterate quickly.

Samples: Sample input & output

Transform JSON to YAML

Input

{"service":"api","port":8080,"enabled":true}

Output

service: api
port: 8080
enabled: true

FAQ: FAQ

  • Are YAML comments kept after conversion?

    No. Comments are not part of the data structure, so a round-trip conversion like JSON ⇔ YAML, which reads the data and writes it back out, drops them. When converting a commented config, plan to re-add any comments you need afterward.

  • How are anchors and aliases (& and *) handled?

    JSON has no anchors or aliases, so on a YAML→JSON conversion the references are expanded (resolved) into their concrete values. Shared structures end up duplicated wherever they were referenced, and the original reference relationship is not restored.

  • Are there type-interpretation gotchas to watch for?

    YAML may read yes/no/on/off as booleans and unquoted digits as numbers. Quote values you want treated as strings — such as a version like "1.10" or a zip code with a leading zero — to avoid bugs from unintended type coercion.

Use cases: Common use cases

  • Converting config formats

    Flip between YAML and JSON to match what tools like Compose or Helm expect.

  • Formatting for documentation

    Share readable YAML in design docs or store machine-friendly JSON for automation.

  • Prepping files for diffing

    Normalize differing formats before comparing so you focus on content changes only.

Notes: Notes & limitations

  • Work stays in your browser

    Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.

  • Validate critical data

    Results are helper outputs—double-check them before sending to production systems or sharing externally.

  • Large payloads depend on your device

    Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.

Formatted results will appear here.

Bidirectional JSON ⇔ YAML Converter

Convert interchangeably and instantaneously between JSON (JavaScript Object Notation) and YAML (YAML Ain’t Markup Language), two standard serialization formats critical for configuration files.
Whether you are writing Kubernetes manifests, Docker Compose scripts, or GitHub Actions workflows, developers constantly run into scenarios like needing to stringify YAML or wanting to validate potentially indented-broken YAML constructs locally in the browser. This secure, stateless utility reliably handles those nuances in real-time.

Common use cases

  • Work with config files: Convert between JSON and YAML for Kubernetes, CI, Docker, and application settings.
  • Validate indentation-sensitive YAML: Catch formatting issues before committing configuration.
  • Prepare API examples: Convert JSON responses into YAML examples for documentation.

Format note

YAML supports features that JSON does not, including comments and some shorthand syntax. After converting YAML to JSON, review whether comments, anchors, or special values were intentionally omitted or normalized.

Articles for this tool

Introduction
2026-01-11

JSON vs. YAML: Choosing the Right Format and How to Convert

JSON and YAML are ubiquitous in development. Compare their features and use cases, see a real conversion example, and learn when to convert between them.

Introduction
2026-05-02

CSV and JSON Conversion: Choosing the Right Format for APIs and Data Migration

Learn how to convert between CSV and JSON safely, including headers, delimiters, value types, nested data, and practical workflow tips.

Introduction
2026-05-02

JSON Formatting and Validation: How to Read API Responses Safely

Learn how to format JSON, catch syntax errors, inspect value types, and turn API responses into types, schemas, or documentation.

Recent Articles

Use Case
2026-08-04

CREATE TABLE Reference: MySQL vs PostgreSQL vs SQLite Types & Constraints

A cross-database CREATE TABLE (DDL) reference with cheat sheets for data types, auto-increment keys (AUTO_INCREMENT / IDENTITY / rowid), foreign key ON DELETE behavior, and the CHECK constraint that MySQL silently ignores.

Introduction
2026-08-03

How CREATE TABLE Generation From a Visual Table Design Works | DDL Builder

A look inside DDL Builder, which turns a visually designed table into CREATE TABLE statements and an ER diagram. Covers the MySQL/PostgreSQL/SQLite type-mapping rules and the column-inference algorithm used for JSON samples.

Use Case
2026-07-21

GitHub Actions needs Design Patterns: Speed Up CI, Avoid the Anti-Patterns

A pattern reference for GitHub Actions job dependencies (needs). Covers diamond-shaped fan-out, concurrency cancellation, fail-fast tradeoffs, matrix-plus-needs gotchas, and reusable workflows, with copy-paste YAML examples.

Use Case
2026-07-21

SQL JOIN Types: Complete Reference to INNER, LEFT, RIGHT & FULL

A reference for SQL JOIN types (INNER/LEFT/RIGHT/FULL/CROSS/SELF) with a cheat sheet and row-count walkthroughs. Covers why one-to-many joins duplicate rows, the WHERE-vs-ON NULL trap, and how to write multi-table joins.

Introduction
2026-07-16

Case Converter: camelCase, snake_case & kebab-case — 9 Styles at Once

Convert identifiers between camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case and more — all nine styles side by side. Handles acronym runs like HTTPServer, digits, and bulk multi-line conversion.

Introduction
2026-07-16

LLM API Cost Calculator: Compare Claude, GPT & Gemini Pricing Side by Side

Paste a prompt, set the expected output tokens, and compare per-request API costs across Claude, GPT and Gemini models. Covers input/output pricing structure, auto-updated price tables, and estimate limits.

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