Unclosed YAML Flow Mapping – Fix Missing } Braces

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A flow mapping opened with { must close with }. Without the closing brace, the parser cannot determine where the inline mapping ends.

31 chars · 1 line

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YAML flow mapping troubleshooting

How to fix an unclosed YAML flow mapping

The sample opens a service mapping with { and provides two pairs but never closes the collection. Flow mappings use an explicit } boundary, so reaching the end of the line or file is not enough. 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. Locate the { that starts the failing inline mapping.
  2. Add the matching } after the intended final pair.
  3. Check every comma and colon inside the braces, then validate the YAML again.

Curly braces are structural in YAML flow mappings

Flow mappings are compact equivalents of block mappings, but their boundaries come from braces rather than indentation. Missing one delimiter leaves the parser inside the collection.

Block style can reduce brace and comma mistakes

A mapping with several configuration fields is often clearer with one key per line. Rewriting to block style can make future edits less dependent on matching punctuation correctly.

Missing closing brace in YAML flow mapping

Close the service mapping after its final port pair.

Invalid YAML

service: {name: api, port: 8080

Corrected YAML

service: {name: api, port: 8080}

Common questions

Frequently asked questions

Does YAML use curly braces for mappings?

It can. Curly braces define flow-style mappings, while block mappings usually place key/value pairs on indented lines without braces.

Can flow mappings span multiple lines?

Yes, but the opening { still requires a matching } and the internal pairs must follow flow collection syntax.

Should I use block style instead of fixing the brace?

Either representation can be valid. Block style is often easier to maintain when the mapping contains many fields.

Recommended next steps

Missing Comma in YAML Flow MappingSeparate key/value pairs inside YAML curly-brace flow mappings.Unclosed YAML Flow SequenceClose square-bracket YAML sequences that reach the end without a matching ].YAML Validator Online – Check YAML SyntaxPaste any YAML document and inspect parser feedback locally.

Debugging a specific YAML issue? Browse YAML troubleshooting.