Flatten YAML

Flatten YAML converts nested YAML structures into dot notation for each key. Paste or import and instantly flatten your data.

Paste your input above or import a file below.
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Supported file types: .yaml, .yml, .txt
Total characters: 0
Options
Maximize output

How to Use:

  • Paste your YAML input into the left-hand box or upload a .yaml, .yml, or .txt file
  • The tool automatically processes the YAML and flattens any nested objects
  • Nested keys are joined using dot notation (e.g., user.contact.email)
  • Click Flatten to manually reprocess the input if needed
  • Click Copy Output to copy the flattened result to your clipboard
  • Click Export to File to save the output as a .yaml or .txt file
  • Use the Maximize output toggle in the Options box to expand the output box for easier reading
  • Click Clear All to reset all fields, options, and counters to default

What Flatten YAML can do:

Flatten YAML reads deeply nested YAML files and restructures them so each value is represented by a single key, where the nesting is shown with dots. For example, a structure like user: { name: Alice, contact: { email: [email protected] } } becomes user.name: Alice and user.contact.email: [email protected]. This is incredibly useful when you need to convert structured data into key-value pairs for systems that don’t support complex YAML such as environment variables, flat config stores, spreadsheet rows, or translation files. Everything happens right in your browser, so your data never leaves your device.

Example:

YAML Input:

user:
  name: Alice
  contact:
    email: [email protected]
    phone: 123-456-7890

Flattened Output:

user.name: Alice
user.contact.email: [email protected]
user.contact.phone: 123-456-7890

Common Use Cases:

Flatten YAML is ideal for simplifying configs before export, generating input for systems that only accept flat data, or prepping keys for spreadsheets, forms, or APIs. It’s also great for developers working on i18n, NoSQL setups, or pipelines that require a simplified format.

Useful Tools & Suggestions:

After decoding your YAML, it’s a good idea to Validate YAML to catch any issues that might’ve crept in during encoding. And if you’re planning to convert it, Transform YAML into JSON keeps your workflow smooth and consistent.

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