Expected <block end> – YAML Indentation Error Fix

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Expected block end errors usually mean indentation changed before the current mapping or sequence could close cleanly.

32 chars · 3 lines

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YAML block troubleshooting

How to fix an expected block end YAML error

The preloaded example de-indents port by one space: it no longer aligns with the nested service mapping, but it is not far enough left to become a valid top-level key. The parser is forced out of the current block at an impossible position. This tool is free to use. No account or payment is required.

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What you can do here

  • YAML 1.2 parser validation
  • Duplicate mapping key detection
  • Preloaded broken YAML example
  • Readable parser feedback
  • .yaml and .yml file import
  • Browser-local processing

Steps

  1. Find the mapping or sequence that contains the reported line.
  2. Align intended siblings or de-indent fully to the actual parent level.
  3. Validate the complete document after the block hierarchy is corrected.

Partial de-indentation creates impossible block boundaries

When a nested block uses two spaces, returning by only one space does not match either the child or the parent level. That can produce expected block end or similar block-structure parser errors.

Look above the reported token

The parser often reports the next key because that is where it discovers the previous block cannot continue. Compare the entire surrounding block instead of editing only the highlighted line.

Premature YAML block ending

The port key should align with name inside the service mapping.

Invalid YAML

service:
  name: api
 port: 8080

Corrected YAML

service:
  name: api
  port: 8080

Common questions

Frequently asked questions

What does expected block end mean in YAML?

It means the parser expected the current mapping or sequence block to finish cleanly, but the following indentation or token did not fit a valid block boundary.

Is expected block end always caused by the highlighted line?

No. A malformed indentation level or unfinished structure immediately before the highlighted token can be the real cause.

Can tabs also trigger block errors?

Yes. Leading tabs are invalid block indentation and can make the apparent visual hierarchy differ from the parsed structure.

Recommended next steps

YAML Indentation ErrorFind mapping or sequence lines that are indented at the wrong nesting level.YAML Sequence Indentation ErrorAlign list markers and nested list content at a consistent YAML indentation level.YAML Validator Online – Check YAML SyntaxPaste any YAML document and inspect parser feedback locally.

Debugging a specific YAML issue? Browse YAML troubleshooting.