Free report·
Sizing programming language communities - Q1 2026
How many developers are using each programming language in Q1 2026
JavaScript continues to hold the top spot with 27.3M developers worldwide.
This 31st edition of SlashData's State of the Developer Nation series sizes the leading programming language communities as of Q1 2026, establishing which languages are growing fastest and how they rank against each other. It examines how language choices shift as developers progress through their careers, and identifies the sectors most associated with the top languages. The report estimates 50M active software developers worldwide, up from approximately 48M in Q3 2025, and tracks movement across the ranking table from Q1 2024 to Q1 2026. It covers the competition for the top spot between JavaScript and Python, Java's enterprise entrenchment, the sustained growth of C/C++, and the steady rise of C#. The experience analysis shows how adoption peaks for mid-career developers, while PHP and C# retain developers as careers mature. Findings are grounded in the Developer Nation Survey combined with SlashData's global developer population modelling.
Key findings
- JavaScript continues to hold the top spot with 27.3M developers worldwide.
- C# is becoming a strategic powerhouse, growing from 10.2M to 13.9M developers in two years, a growth backed by Unity's dominance in mobile gaming and Microsoft's push to make NET a credible cross-platform environment.
- Python (26.3M) has overtaken Java (24M) for the second wave in a row, claiming a clear second place.
- Mid-career developers (six to ten years of experience) are the most strategically valuable cohort. They use the widest range of languages on average and represent peak adoption for nearly every major language.
- C/C++ is a notable growth story, with a population surging significantly in the past two years, from 13.7M in Q1 2024 to 21.6M in Q1 2026.
Questions this report answers
Which programming language has the most developers in Q1 2026?
JavaScript, including TypeScript, remains the world's most widely used language with 27.3M active developers worldwide as of Q1 2026.
Has Python overtaken Java?
Yes. As of Q1 2026, Python has extended its advantage over Java (26.3M vs. 24.0M), cementing a reversal that first emerged in the previous wave.
How fast is the C/C++ community growing?
The combined C/C++ community has grown from 13.7M in Q1 2024 to 21.6M in Q1 2026, an increase of nearly 8M active developers in two years, while standalone C++ grew from 11.6M to 19.4M over the same period.
How many active software developers are there worldwide?
As of Q1 2026, SlashData estimates there are 50M active software developers worldwide, up from approximately 48M in Q3 2025.
Which developers use the widest range of languages?
Developers with six to ten years of experience use the widest range of languages on average (5.3 vs an average of 4.5), making them most likely to encounter, evaluate, and adopt new tools.
Why do PHP and C# behave differently to other languages across experience levels?
Unlike most languages, PHP and C# do not fall sharply at 11+ years of experience: PHP holds at 25% across both the six-to-ten and 11+ bands, while C# rises to 34% at six to ten years and holds at 32% at 11+ years, reflecting their prevalence in enterprise and legacy systems.
Who it's for
- Product executives deciding which languages to prioritise for SDKs, APIs and documentation
- Engineering leaders tracking the size and trajectory of language communities
- Toolmakers and developer-focused vendors targeting specific languages or sectors