awesome-repositories.com
Blog
MCP
awesome-repositories.com

Discover the best open-source repositories with AI-powered search.

ExploreCurated searchesOpen-source alternativesSelf-hosted softwareBlogSitemap
ProjectMCP serverAboutHow we rankPress
LegalPrivacyTerms
© 2026 Bringes Technology SRL·VAT RO45896025·hello@awesome-repositories.com
fmtlib avatar

fmtlib/fmt

0
View on GitHub↗
23,596 stars·2,910 forks·C++·MIT·20 viewsfmt.dev↗

Fmt

fmt is a type-safe C++ text formatting library used to convert data into formatted strings and text. It serves as a high-performance string buffer utility and provided the basis for the formatting features introduced in the C++20 standard.

The library shifts format string validation and size computation to the compilation phase to prevent runtime crashes and increase execution speed. It utilizes a memory-efficient interface to write formatted data directly into buffers, minimizing allocations and eliminating intermediate string overhead.

The project covers a broad range of text processing capabilities, including the serialization of containers, floating-point numbers, and temporal data. It includes utilities for ANSI console text styling and supports custom type formatting through a standardized extension interface.

The library can be imported as a C++20 module using native build targets.

Features

  • Compile-Time Format Validators - Analyzes format strings during compilation to ensure specifiers match the provided argument types before execution.
  • Text Formatting - Provides a type-safe text formatting system using positional arguments and specifiers for general variable conversion.
  • Custom Type Converters - Provides a standardized extension interface to support user-defined types in the formatting system.
  • Format String Validators - Checks format specifiers against argument types during compilation to prevent runtime crashes caused by mismatched data types.
  • Formatted Output Buffers - Provides a memory-efficient interface to write formatted data directly into buffers to eliminate intermediate string allocations.
  • Formatted String Buffers - Provides a memory-efficient interface for writing formatted data directly into buffers to minimize allocations.
  • String Formatting Utilities - Provides a type-safe API and generic dispatch for formatting C strings into memory buffers.
  • C++ Text Formatting Libraries - Converts variables and complex data types into human-readable strings using a type-safe and performant API.
  • Standard Library Extensions - Serves as the basis for the std::format feature introduced in the C++20 standard.
  • Standard Library Type Formatting - Provides built-in formatting rules for C++ standard types including durations, time points, and filesystem paths.
  • User-Defined Type Formatters - Allows user-defined types to be formatted by specializing a standard formatter template.
  • Buffered Input Output Managers - Implements high-performance buffered output to optimize write operations and prevent buffer overflows.
  • Output Stream Managers - Writes data directly into stream buffers to eliminate intermediate memory allocations and maximize output speed.
  • Datetime String Formatting - Renders temporal data and datetime objects into human-readable strings using customizable formats.
  • Collection Serialization - Serializes collections and containers into a readable string representation.
  • Terminal Output Stylers - Adds colors and visual emphasis to terminal output using standardized style objects.
  • High-Performance Console Output - Writes styled text and data to streams or consoles while minimizing memory allocations and avoiding buffer overflows.
  • Compile-Time Formatting - Validates format strings and computes output sizes during compilation to prevent runtime errors and increase speed.
  • Positional Argument Mapping - Resolves variables in a format string using numeric indices to support localized text reordering.
  • Generic Dispatch Mechanisms - Uses template metaprogramming to resolve the correct formatting function for a given type without runtime overhead.
  • Floating-Point String Conversion - Converts floating-point numbers to strings with guaranteed correctness and precise rounding.
  • Constant-Expression Parsing - Evaluates format string syntax at compile time to reduce the processing required during program execution.
  • Console Markup Support - Supports styled terminal output using ANSI colors and text markup for console and file printing.
  • Text Styling Utilities - Applies visual styles and emphasis to output using dedicated style objects for terminal-based decoration.
  • Date and Time Formatting - Renders dates, times, and durations into customizable human-readable strings with guaranteed correctness.
  • Data Formatting - Modern and efficient formatting library.
  • Developer Tools - Modern C++ formatting library.
  • Developer Tools and Utilities - Modern, fast formatting library.
  • Formatting and Logging - Modern, fast, and safe formatting library.
  • General Utilities - Safe and fast formatting library for C++.

Star history

Star history chart for fmtlib/fmtStar history chart for fmtlib/fmt

How this analysis was created: This summary and feature list are AI-generated from collected project material and can contain mistakes. Stars, license and language are imported from GitHub. Inclusion does not mean that we have tested or audited this project. Check the source documentation for any feature you depend on. Learn more on our About page.

AI search

Explore more awesome repositories

Describe what you need in plain English — the AI ranks thousands of curated open-source projects by relevance.

Start searching with AI

Projects sharing features with Fmt

These projects share indexed features with Fmt. Shared tags can include platform or build tooling; verify the primary use case before treating a result as a replacement.
  • cppformat/cppformatcppformat avatar

    cppformat/cppformat

    23,626View on GitHub↗

    cppformat is a type-safe C++ formatting library that serves as a high-performance alternative to standard C++ input and output streams for converting data into formatted strings. It integrates a compile-time format validator to ensure format specifiers match argument types, preventing runtime crashes. The library includes a positional argument engine that enables the reordering of text arguments for internationalization and localization. It also features a Unicode text formatter to ensure consistent and portable character representation across different operating systems. The project provide

    C++
    View on GitHub↗23,626
  • gabime/spdloggabime avatar

    gabime/spdlog

    28,922View on GitHub↗

    spdlog is a high-performance C++ logging library designed to record diagnostic messages and application events. It serves as an asynchronous logging framework and thread-safe library that coordinates access across concurrent threads to maintain message integrity. The project functions as a multi-target log router, distributing single events to multiple destinations such as consoles, files, and system daemons. It includes a log rotation manager that handles file lifecycles through basic, rotating, or daily rollover strategies to prevent disk exhaustion. The library covers a broad range of cap

    C++cppcpp11header-only
    View on GitHub↗28,922
  • viatorus/emioViatorus avatar

    Viatorus/emio

    185View on GitHub↗

    A safe and fast high-level and low-level character input/output library for bare-metal and RTOS based embedded systems with a very small binary footprint.

    C++
    View on GitHub↗185
  • pallets/clickpallets avatar

    pallets/click

    17,560View on GitHub↗

    Click is a Python framework for building command-line interfaces. It provides a declarative approach to defining command structures, allowing developers to map functions to command-line arguments, options, and nested groups using decorators. The framework handles the complexities of parameter parsing, type validation, and help documentation generation automatically. The project distinguishes itself through its hierarchical context system, which propagates configuration and state across nested commands, and its environment-aware parameter resolution that prioritizes command-line inputs, enviro

    Pythoncliclickpallets
    View on GitHub↗17,560
Compare all 30 related projects→

Frequently asked questions

What does fmtlib/fmt do?

fmt is a type-safe C++ text formatting library used to convert data into formatted strings and text. It serves as a high-performance string buffer utility and provided the basis for the formatting features introduced in the C++20 standard.

What are the main features of fmtlib/fmt?

The main features of fmtlib/fmt are: Compile-Time Format Validators, Text Formatting, Custom Type Converters, Format String Validators, Formatted Output Buffers, Formatted String Buffers, String Formatting Utilities, C++ Text Formatting Libraries.

Which projects share features with fmtlib/fmt?

Projects with overlapping indexed features include: cppformat/cppformat — cppformat is a type-safe C++ formatting library that serves as a high-performance alternative to standard C++ input… gabime/spdlog — spdlog is a high-performance C++ logging library designed to record diagnostic messages and application events. It… viatorus/emio — A safe and fast high-level and low-level character input/output library for bare-metal and RTOS based embedded systems… pallets/click — Click is a Python framework for building command-line interfaces. It provides a declarative approach to defining… arthursonzogni/ftxui — FTXUI is a C++ terminal user interface library and cross-platform console framework used for building interactive… willmcgugan/rich — Rich is a Python terminal formatting library and user interface framework. It provides tools for rendering rich text,…