Background and Purpose: English is an official language of Pakistan and it is not only taught as a subject, but it is also used as a medium of instruction in Pakistan. However, students find English language learning a difficult experience. Their difficulties are compounded by monolingual English language teaching policies and their individual differences which are linked with their motivation, level of anxiety and confidence. This study aimed at finding out the relationship between code-switching and learners’ affective response and its impacts on attaining success in ESL classrooms.
 
 Methodology: Data for this mixed method study were collected through purposive sampling via questionnaires, interviews, and field notes from the students majoring in English at a private university in Pakistan. Quantitative data is analyzed throughSPSS whereas qualitatively the data is analyzed by using constant comparative technique.
 
 Findings: The findings unveil that code-switching is an effective teaching strategy in ESL classrooms to deal with the learning of vocabulary, comprehension of abstract concepts, the performance of a difficult task, participation in classroom discussions, and the clarity of concepts. Moreover, switching to L1 also gives them satisfaction, fosters attention span, creates enjoyment, and boosts confidence, resultantly their performance improves.
 
 Contribution: The study provides implications for stakeholders including teachers, teacher trainers and policy makers to introduce pedagogical code-switching in ESL classrooms to foster the motivation and self-confidence of the students. The study concludes that though code-switching carries benefits, however, it should be used strategically to improve learners’ performance.
 
 Keywords: Code-switching, affective-response, success, ESL classrooms.
 
 Cite as: Nawaz, N., Atta, A., & Naseem, N. (2023). The impact of code-switching in affective support and learners’ success in Pakistani ESL classrooms at university level. Journal of Nusantara Studies, 8(1), 95-116. http://dx.doi.org/10.24200/jonus.vol8iss1pp95-116
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