Taplo
What it is
Taplo is a free toolkit for validating, formatting, and querying TOML documents, with TOML 1.0.0 support. Its validator checks syntax and semantic problems such as duplicate keys, and can also validate against JSON Schema Draft 4. The formatter can edit files in place or use standard input and output; it stops on syntax errors by default. Its command-line interface converts TOML to JSON and retrieves values using query expressions. Taplo includes a TOML language server that communicates over standard input/output or TCP, though it cannot serve multiple TCP clients. The server is excluded from default builds and unavailable through the NPM installation. The Even Better TOML Visual Studio Code extension offers highlighting, validation, folding, navigation, renaming, formatting, and JSON Schema completion. Its listing calls it a preview that may contain bugs or crash. Taplo can retrieve schemas from catalogs such as JSON Schema Store and match them to files by name. Installation options include precompiled releases, Cargo, Homebrew, NPM, and Docker; precompiled releases are listed for Linux, macOS, and Windows on several architectures.
For and against
For
- Supports TOML 1.0.0 and JSON Schema Draft 4 validation.
- Formats files in place or through standard input/output.
- Converts TOML to JSON and extracts queried values.
- Available through several installation methods.
Against
- Language server is absent from default builds.
- Language server is unavailable in the NPM installation.
- Language server cannot support multiple TCP clients.
- VS Code extension preview may contain bugs or crash.
The verdict
Taplo offers a broad set of TOML tools, from validation and formatting to conversion and editor features. Check the language-server availability limits and the preview status of the Visual Studio Code extension if those are central to your workflow.
Who it suits
Taplo suits developers who work with TOML and want command-line validation, formatting, conversion, queries, or editor support. Its language-server and extension caveats matter for users relying on those tools.
Plans and prices
Taplo
No paid tiers or usage limits are stated on the official pages reviewed.
Read 4 Oct 2026 · taplo.tamasfe.dev
On the record
- Conversion and queries
- The CLI converts TOML to JSON and extracts values using query expressions.taplo.tamasfe.dev · read 4 Oct 2026
- Editor integration
- The Even Better TOML Visual Studio Code extension offers syntax highlighting, validation, folding, navigation, renaming, formatting, and JSON Schema completion.marketplace.visualstudio.com · read 4 Oct 2026
- Embedding
- Taplo aims to be embeddable in software across programming languages and environments.taplo.tamasfe.dev · read 4 Oct 2026
- Extension status
- The Visual Studio Code listing describes the extension as a preview that may contain bugs or crash.marketplace.visualstudio.com · read 4 Oct 2026
- Formatting
- The formatter can edit files in place or use standard input and output, and it stops on syntax errors by default to avoid destructive edits.taplo.tamasfe.dev · read 4 Oct 2026
- Install options
- The CLI is available as precompiled releases, through Cargo, Homebrew, NPM, and Docker.taplo.tamasfe.dev · read 4 Oct 2026
- Language server
- The TOML language server communicates over standard input/output or TCP; multiple TCP clients are not supported.taplo.tamasfe.dev · read 4 Oct 2026
- Language server limit
- The language server is excluded from default builds and is unavailable in the NPM installation.taplo.tamasfe.dev · read 4 Oct 2026
- Purpose
- Taplo is a TOML toolkit for validating, formatting, and querying TOML documents.taplo.tamasfe.dev · read 4 Oct 2026
- Schema integration
- Taplo supports schema catalogs such as JSON Schema Store for retrieving schemas and matching them to files by name.taplo.tamasfe.dev · read 4 Oct 2026
- Security and trust
- The official pages reviewed do not state security certifications or compliance claims.taplo.tamasfe.dev · read 4 Oct 2026
- Supported operating systems
- Precompiled releases are listed for Linux, macOS, and Windows on several architectures.taplo.tamasfe.dev · read 4 Oct 2026
- TOML support
- Taplo supports TOML 1.0.0.taplo.tamasfe.dev · read 4 Oct 2026
- Validation
- Taplo validates TOML syntax and semantic errors such as duplicate keys, and supports JSON Schema Draft 4 validation.taplo.tamasfe.dev · read 4 Oct 2026
