3-Aminophenylacetic acid is primarily used as an intermediate in the synthesis of various pharmaceuticals. It plays a crucial role in the production of anti-inflammatory drugs and analgesics, contributing to the development of medications that alleviate pain and reduce inflammation. Additionally, this compound is utilized in the preparation of dyes and pigments, where it acts as a building block for creating colorants with specific properties. Its application extends to organic synthesis, where it serves as a precursor for the development of complex organic molecules used in research and industrial processes.