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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Formatters for logging `tracing` events."><title>tracing_subscriber::fmt::format - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="logo-container" href="../../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">Module format</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></section><h2><a href="../index.html">In tracing_subscriber::fmt</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../../tracing_subscriber/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../../index.html">tracing_subscriber</a>::<wbr><a href="../index.html">fmt</a>::<wbr><a class="mod" href="#">format</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#1-2179">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Formatters for logging <code>tracing</code> events.</p>
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<p>This module provides several formatter implementations, as well as utilities
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for implementing custom formatters.</p>
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<h2 id="formatters"><a href="#formatters">Formatters</a></h2>
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<p>This module provides a number of formatter implementations:</p>
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<ul>
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<li>
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<p><a href="struct.Full.html" title="struct tracing_subscriber::fmt::format::Full"><code>Full</code></a>: The default formatter. This emits human-readable,
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single-line logs for each event that occurs, with the current span context
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displayed before the formatted representation of the event. See
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<a href="struct.Full.html#example-output" title="struct tracing_subscriber::fmt::format::Full">here</a> for sample output.</p>
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</li>
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<li>
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<p><a href="struct.Compact.html" title="struct tracing_subscriber::fmt::format::Compact"><code>Compact</code></a>: A variant of the default formatter, optimized for
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short line lengths. Fields from the current span context are appended to
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the fields of the formatted event, and span names are not shown; the
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verbosity level is abbreviated to a single character. See
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<a href="struct.Compact.html#example-output" title="struct tracing_subscriber::fmt::format::Compact">here</a> for sample output.</p>
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</li>
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<li>
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<p><a href="struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty"><code>Pretty</code></a>: Emits excessively pretty, multi-line logs, optimized
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for human readability. This is primarily intended to be used in local
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development and debugging, or for command-line applications, where
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automated analysis and compact storage of logs is less of a priority than
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readability and visual appeal. See <a href="struct.Pretty.html#example-output" title="struct tracing_subscriber::fmt::format::Pretty">here</a>
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for sample output.</p>
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</li>
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<li>
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<p>[<code>Json</code>]: Outputs newline-delimited JSON logs. This is intended
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for production use with systems where structured logs are consumed as JSON
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by analysis and viewing tools. The JSON output is not optimized for human
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readability. See <a href="Json#example-output">here</a> for sample output.</p>
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</li>
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</ul>
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</div></details><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Compact.html" title="struct tracing_subscriber::fmt::format::Compact">Compact</a></div><div class="desc docblock-short">Marker for <a href="struct.Format.html" title="struct tracing_subscriber::fmt::format::Format"><code>Format</code></a> that indicates that the compact log format should be used.</div></li><li><div class="item-name"><a class="struct" href="struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a></div><div class="desc docblock-short">The default <a href="../trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields"><code>FormatFields</code></a> implementation.</div></li><li><div class="item-name"><a class="struct" href="struct.DefaultVisitor.html" title="struct tracing_subscriber::fmt::format::DefaultVisitor">DefaultVisitor</a></div><div class="desc docblock-short">The <a href="../../field/trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a> produced by <a href="struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields"><code>DefaultFields</code></a>’s <a href="../../field/trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor"><code>MakeVisitor</code></a> implementation.</div></li><li><div class="item-name"><a class="struct" href="struct.FieldFn.html" title="struct tracing_subscriber::fmt::format::FieldFn">FieldFn</a></div><div class="desc docblock-short">A <a href="../trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields"><code>FormatFields</code></a> implementation that formats fields by calling a function
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or closure.</div></li><li><div class="item-name"><a class="struct" href="struct.FieldFnVisitor.html" title="struct tracing_subscriber::fmt::format::FieldFnVisitor">FieldFnVisitor</a></div><div class="desc docblock-short">The <a href="../../field/trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a> produced by <a href="struct.FieldFn.html" title="struct tracing_subscriber::fmt::format::FieldFn"><code>FieldFn</code></a>’s <a href="../../field/trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor"><code>MakeVisitor</code></a> implementation.</div></li><li><div class="item-name"><a class="struct" href="struct.FmtSpan.html" title="struct tracing_subscriber::fmt::format::FmtSpan">FmtSpan</a></div><div class="desc docblock-short">Configures what points in the span lifecycle are logged as events.</div></li><li><div class="item-name"><a class="struct" href="struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a></div><div class="desc docblock-short">A pre-configured event formatter.</div></li><li><div class="item-name"><a class="struct" href="struct.Full.html" title="struct tracing_subscriber::fmt::format::Full">Full</a></div><div class="desc docblock-short">Marker for <a href="struct.Format.html" title="struct tracing_subscriber::fmt::format::Format"><code>Format</code></a> that indicates that the default log format should be used.</div></li><li><div class="item-name"><a class="struct" href="struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty">Pretty</a></div><div class="desc docblock-short">An excessively pretty, human-readable event formatter.</div></li><li><div class="item-name"><a class="struct" href="struct.PrettyFields.html" title="struct tracing_subscriber::fmt::format::PrettyFields">PrettyFields</a></div><div class="desc docblock-short">An excessively pretty, human-readable <a href="../../field/trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor"><code>MakeVisitor</code></a> implementation.</div></li><li><div class="item-name"><a class="struct" href="struct.PrettyVisitor.html" title="struct tracing_subscriber::fmt::format::PrettyVisitor">PrettyVisitor</a></div><div class="desc docblock-short">The <a href="../../field/trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a> produced by <a href="struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty"><code>Pretty</code></a>’s <a href="../../field/trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor"><code>MakeVisitor</code></a> implementation.</div></li><li><div class="item-name"><a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a></div><div class="desc docblock-short">A writer to which formatted representations of spans and events are written.</div></li></ul><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::format::FormatEvent">FormatEvent</a></div><div class="desc docblock-short">A type that can format a tracing <a href="../../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a> to a <a href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a>.</div></li><li><div class="item-name"><a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::format::FormatFields">FormatFields</a></div><div class="desc docblock-short">A type that can format a <a href="../../field/trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">set of fields</a> to a <a href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a>.</div></li></ul><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.debug_fn.html" titl
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provided function or closure.</div></li><li><div class="item-name"><a class="fn" href="fn.format.html" title="fn tracing_subscriber::fmt::format::format">format</a></div><div class="desc docblock-short">Returns the default configuration for an [event formatter].</div></li></ul></section></div></main></body></html>
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