{"slug":"best-code-formatter","title":"Best code formatter","question":"What is the best code formatter for a multi-language codebase in 2026?","verdict":"As of 2026-08-23, ChatGPT, Claude, Gemini and Grok collectively rank dprint #1 for code formatter on ModelsAgree by aggregate score. The models' case: Best overall fit for a genuinely polyglot repository: extremely fast native core, deterministic formatting, one configuration/CLI, and a strong plugin system covering. The models' main caveat: Coverage quality depends on individual plugins, so obscure languages may rely on relatively young third-party integrations rather than a first-party. The strongest alternative is Prettier — Broadest native support for ubiquitous frontend, configuration, and documentation languages (JS/TS, JSON, YAML, Markdown, CSS, HTML, GraphQL) with an. Not unanimous: Gemini picks Prettier. Source: https://modelsagree.com/best/best-code-formatter (modelsagree.com, CC BY 4.0).","category":"DevEx","url":"https://modelsagree.com/best/best-code-formatter","updated":"2026-08-23","models":["ChatGPT","Claude","Gemini","Grok"],"consensus":"3 of 4 models rank dprint the top pick","disagreement":"Gemini picks Prettier","combined":[{"rank":1,"product":"dprint","domain":"dprint.dev","score":19,"appearances":4,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":2,"Grok":1},"reason":"Best overall fit for a genuinely polyglot repository: extremely fast native core, deterministic formatting, one configuration/CLI, and a strong plugin system covering TypeScript/JavaScript, JSON, Markdown, TOML, YAML, Dockerfile, CSS-family languages, HTML/Vue/Svelte/Astro, GraphQL, Python via Ruff, C# via Roslyn, Go via gofumpt, and more; it can even delegate to Prettier or other formatters when needed. ([Dprint Plugins][1])"},{"rank":2,"product":"Prettier","domain":"prettier.io","score":16,"appearances":4,"modelRanks":{"ChatGPT":3,"Claude":2,"Gemini":1,"Grok":2},"reason":"Broadest native support for ubiquitous frontend, configuration, and documentation languages (JS/TS, JSON, YAML, Markdown, CSS, HTML, GraphQL) with an opinionated, zero-debate AST formatting engine and universal editor integration."},{"rank":3,"product":"treefmt","domain":"treefmt.com","score":9,"appearances":3,"modelRanks":{"ChatGPT":2,"Claude":4,"Gemini":3},"reason":"Near-tie with dprint for highly polyglot codebases because it takes the pragmatic approach of orchestrating each language's best native formatter behind one command, runs formatters in parallel, and can restrict work to changed files; particularly strong when a repo spans ecosystems such as Go, Rust, Python, Nix, C++, and TypeScript rather than mostly web languages. ([GitHub][2])"},{"rank":4,"product":"Spotless","domain":"github.com","score":5,"appearances":2,"modelRanks":{"ChatGPT":4,"Grok":3},"reason":"Mature build-system-native compositor (Gradle/Maven primary) that cleanly wraps best-of-breed formatters (Prettier, clang-format, Black, ktlint, google-java-format, etc.) across dozens of languages with incremental/git-ratchet intelligence, license-header handling, and idempotency safeguards—highest real-world value when the project already lives in a JVM build"},{"rank":5,"product":"Biome","domain":"biomejs.dev","score":4,"appearances":2,"modelRanks":{"ChatGPT":5,"Claude":3},"reason":"Single Rust binary that formats and lints JS/TS/JSX/JSON/CSS/GraphQL at very high speed with ~97% Prettier compatibility and near-zero config; excellent for teams wanting one fast tool replacing Prettier+ESLint."},{"rank":6,"product":"Clang-Format","domain":"llvm.org","score":2,"appearances":1,"modelRanks":{"Gemini":4},"reason":"Battle-tested, high-speed LLVM-backed binary delivering deep AST-aware formatting across multiple core systems and enterprise languages (C, C++, C#, Java, Objective-C, Protobuf, JSON, JavaScript)."},{"rank":7,"product":"Ruff","domain":"astral.sh","score":1,"appearances":1,"modelRanks":{"Claude":5},"reason":"For Python-heavy multi-language repos, the fastest and now-standard Python formatter+linter in one Rust binary, Black-compatible output with far greater speed and an integrated lint autofix path."},{"rank":8,"product":"Trunk","domain":"trunk.io","score":1,"appearances":1,"modelRanks":{"Gemini":5},"reason":"Turnkey multi-language formatting platform that hermetically provisions, caches, and runs formatters across dozens of programming languages with seamless IDE and CI integration."}],"perModel":{"ChatGPT":[{"rank":1,"product":"dprint","reason":"Best overall fit for a genuinely polyglot repository: extremely fast native core, deterministic formatting, one configuration/CLI, and a strong plugin system covering TypeScript/JavaScript, JSON, Markdown, TOML, YAML, Dockerfile, CSS-family languages, HTML/Vue/Svelte/Astro, GraphQL, Python via Ruff, C# via Roslyn, Go via gofumpt, and more; it can even delegate to Prettier or other formatters when needed. ([Dprint Plugins][1])","fix":"Coverage quality depends on individual plugins, so obscure languages may rely on relatively young third-party integrations rather than a first-party formatter."},{"rank":2,"product":"treefmt","reason":"Near-tie with dprint for highly polyglot codebases because it takes the pragmatic approach of orchestrating each language's best native formatter behind one command, runs formatters in parallel, and can restrict work to changed files; particularly strong when a repo spans ecosystems such as Go, Rust, Python, Nix, C++, and TypeScript rather than mostly web languages. ([GitHub][2])","fix":"It is a formatter multiplexer rather than a formatter engine, so teams must install, configure, version, and understand the underlying tools themselves."},{"rank":3,"product":"Prettier","reason":"Still the strongest default when “multi-language” mostly means web-stack languages and config files: mature, intentionally opinionated output, excellent editor/CI integration, broad built-in web-language support, and an extensible plugin API for additional languages. ([Prettier][3])","fix":"Its native sweet spot remains the web ecosystem; truly polyglot repositories involving languages such as Go, Rust, Python, Java, or C++ generally need separate formatters or third-party plugins."},{"rank":4,"product":"Spotless","reason":"Exceptionally capable for large mixed-language repositories built around Gradle or Maven: provides one enforcement layer while delegating to proven formatters including google-java-format, ktfmt, scalafmt, clang-format, Black, Prettier, Biome and others, plus useful capabilities such as formatting ratchets, license headers, exclusions, and custom transformations. ([GitHub][4])","fix":"Its Gradle/Maven and JVM-centric operating model is unnecessary friction for polyglot repositories that are not already anchored in the Java build ecosystem."},{"rank":5,"product":"Biome","reason":"Outstanding speed, ergonomics, deterministic formatting, and a unified formatter/linter architecture make it arguably the best choice for JS/TS-heavy repositories that also contain CSS, JSON and GraphQL; its language footprint has expanded substantially, making it a credible multi-language tool rather than merely a Prettier replacement. ([Biome][5])","fix":"Important polyglot languages remain unsupported or unfinished, including Python, Go, Rust, Java and C/C++, while several web formats such as HTML/Vue/Svelte/Astro are still experimental. ([Biome][5])"}],"Claude":[{"rank":1,"product":"dprint","reason":"Purpose-built multi-language formatter with a fast Rust/WASM plugin engine; one config file and one binary format TypeScript/JS, JSON, Markdown, TOML, CSS, Dockerfile, and (via plugins) Ruff/malva-style additions, with incremental caching that makes large monorepos fast; pluginauthorable so teams can add languages.","fix":"Plugin ecosystem is thinner than Prettier's for niche web frameworks (Vue/Svelte/templating), and community momentum is smaller, so some ecosystems lack a mature plugin."},{"rank":2,"product":"Prettier","reason":"The de facto formatter for the web stack with the widest real language coverage across one tool — JS/TS, JSX, HTML, Vue, Svelte, Angular, CSS/SCSS/Less, GraphQL, Markdown, YAML, JSON — mature, battle-tested, opinionated defaults that end style debates, and near-universal editor/CI integration.","fix":"JavaScript-based and slow on large codebases; opinionated with almost no config, and outside the web/JS ecosystem it doesn't format systems languages (Go, Rust, Python)."},{"rank":3,"product":"Biome","reason":"Single Rust binary that formats and lints JS/TS/JSX/JSON/CSS/GraphQL at very high speed with ~97% Prettier compatibility and near-zero config; excellent for teams wanting one fast tool replacing Prettier+ESLint.","fix":"Language scope is still web-centric and narrower than Prettier (limited HTML/Vue/Markdown/YAML), so it's not a true all-languages solution on its own."},{"rank":4,"product":"treefmt","reason":"A meta-formatter/orchestrator, not a formatter itself — the pragmatic real-world answer for genuinely polyglot repos: it dispatches each file type to the best native formatter (gofmt, rustfmt, Black/Ruff, Prettier, etc.) under one config and one command, with caching, so you get best-in-class per-language output.","fix":"Only as good as the tools you wire up; requires installing and version-pinning many underlying formatters, so setup and reproducibility overhead is real (mitigated but not eliminated by Nix)."},{"rank":5,"product":"Ruff","reason":"For Python-heavy multi-language repos, the fastest and now-standard Python formatter+linter in one Rust binary, Black-compatible output with far greater speed and an integrated lint autofix path.","fix":"Python-only — it solves one language superbly but must be paired with another tool for a multi-language codebase, so it earns a spot only as the Python component."}],"Gemini":[{"rank":1,"product":"Prettier","reason":"Broadest native support for ubiquitous frontend, configuration, and documentation languages (JS/TS, JSON, YAML, Markdown, CSS, HTML, GraphQL) with an opinionated, zero-debate AST formatting engine and universal editor integration.","fix":"Node.js runtime overhead causes sluggish performance on massive monorepos, and it lacks native first-party support for major compiled backend languages like Go, Rust, C++, and Python."},{"rank":2,"product":"dprint","reason":"Ultra-fast Rust- and WASM-based pluggable formatting engine specifically designed for multi-language repositories (covering TS/JS, JSON, Markdown, TOML, Dockerfile, with Prettier bridge capabilities); near-tie with Prettier for performance-sensitive workflows.","fix":"First-party native plugin coverage is limited for backend-heavy languages, requiring reliance on external tool delegation or community plugins."},{"rank":3,"product":"treefmt","reason":"Purpose-built polyglot formatter orchestrator that unifies canonical language-native formatters (e.g., ruff, rustfmt, gofumpt, prettier) into a single parallelized, git-aware execution tree with centralized caching.","fix":"It is an orchestrator rather than a standalone formatting engine, requiring external toolchains and language runtimes to be pre-installed and managed on host systems."},{"rank":4,"product":"Clang-Format","reason":"Battle-tested, high-speed LLVM-backed binary delivering deep AST-aware formatting across multiple core systems and enterprise languages (C, C++, C#, Java, Objective-C, Protobuf, JSON, JavaScript).","fix":"Completely lacks support for modern web markup, stylesheets, and standard configuration formats (YAML, TOML, Markdown), making it ineffective for full-stack repositories."},{"rank":5,"product":"Trunk","reason":"Turnkey multi-language formatting platform that hermetically provisions, caches, and runs formatters across dozens of programming languages with seamless IDE and CI integration.","fix":"Commercial platform backing with telemetry overhead and a heavier client footprint than lightweight, standalone open-source CLI formatters."}],"Grok":[{"rank":1,"product":"dprint","reason":"Purpose-built pluggable Rust/WASM platform that unifies formatting across languages via official plugins (TS/JS, JSON, Markdown, TOML, Dockerfile, Jupyter) plus mature wrappers (Ruff for Python, Roslyn for C#, Mago for PHP, Malva for CSS, markupfmt for HTML/Vue/Svelte, Prettier/Biome/Oxc adapters, and exec for any CLI); single config, incremental caching, sandboxed plugins, and extreme speed make it the highest-value single tool for real polyglot/monorepo work","fix":"Ecosystem and editor integrations still lag Prettier; plugin management and occasional wrapper quirks mean it is not zero-friction for pure-JS teams that never leave the Prettier/Biome world"},{"rank":2,"product":"Prettier","reason":"Most mature and widely battle-tested multi-language formatter with deep plugin coverage for the languages that dominate real codebases (JS/TS, CSS, HTML, Markdown, YAML, GraphQL and many more via community plugins); universal editor/CI support and opinionated consistency deliver immediate practical value without custom infrastructure","fix":"JS runtime and sequential processing make it slow on large multi-language monorepos; systems languages (Go, Rust, C++, Python) still require external tools so it never fully replaces a polyglot stack"},{"rank":3,"product":"Spotless","reason":"Mature build-system-native compositor (Gradle/Maven primary) that cleanly wraps best-of-breed formatters (Prettier, clang-format, Black, ktlint, google-java-format, etc.) across dozens of languages with incremental/git-ratchet intelligence, license-header handling, and idempotency safeguards—highest real-world value when the project already lives in a JVM build","fix":"Fundamentally a build plugin rather than a lightweight standalone CLI; overhead and configuration surface make it overkill or awkward for non"}]},"missedByModel":{"ChatGPT":[{"product":"clang-format","reason":"excellent and highly configurable for C/C++/Objective-C and several related languages, but its language breadth is too narrow for a general polyglot-codebase winner"},{"product":"Trunk","reason":"useful repository-wide formatter/linter orchestration, but adds a broader tooling platform where treefmt or dprint provides a simpler formatter-focused solution"}],"Claude":[{"product":"EditorConfig","reason":"near-universal baseline for whitespace/EOL rules but not a real code formatter — it can't reformat code structure"},{"product":"Spotless","reason":"excellent Gradle/Maven-native polyglot orchestrator like treefmt, but effectively tied to the JVM build ecosystem, limiting it outside Java/Kotlin-centric repos"}],"Gemini":[{"product":"Biome","reason":"delivers exceptional formatting performance but remains largely confined to the web and JavaScript ecosystem rather than broad polyglot stacks"}]}}