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diff --git a/src/nvim/api/helpers.h b/src/nvim/api/helpers.h
new file mode 100644
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+++ b/src/nvim/api/helpers.h
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+#ifndef NEOVIM_API_HELPERS_H
+#define NEOVIM_API_HELPERS_H
+
+#include <stdbool.h>
+
+#include "api/defs.h"
+#include "../vim.h"
+
+#define set_api_error(message, err)                \
+  do {                                             \
+    strncpy(err->msg, message, sizeof(err->msg));  \
+    err->set = true;                               \
+  } while (0)
+
+/// Start block that may cause vimscript exceptions
+void try_start(void);
+
+/// End try block, set the error message if any and return true if an error
+/// occurred.
+///
+/// @param err Pointer to the stack-allocated error object
+/// @return true if an error occurred
+bool try_end(Error *err);
+
+/// Recursively expands a vimscript value in a dict
+///
+/// @param dict The vimscript dict
+/// @param key The key
+/// @param[out] err Details of an error that may have occurred
+Object dict_get_value(dict_T *dict, String key, Error *err);
+
+/// Set a value in a dict. Objects are recursively expanded into their
+/// vimscript equivalents. Passing 'nil' as value deletes the key.
+///
+/// @param dict The vimscript dict
+/// @param key The key
+/// @param value The new value
+/// @param[out] err Details of an error that may have occurred
+/// @return the old value, if any
+Object dict_set_value(dict_T *dict, String key, Object value, Error *err);
+
+/// Gets the value of a global or local(buffer, window) option.
+///
+/// @param from If `type` is `SREQ_WIN` or `SREQ_BUF`, this must be a pointer
+///        to the window or buffer.
+/// @param type One of `SREQ_GLOBAL`, `SREQ_WIN` or `SREQ_BUF`
+/// @param name The option name
+/// @param[out] err Details of an error that may have occurred
+/// @return the option value
+Object get_option_from(void *from, int type, String name, Error *err);
+
+/// Sets the value of a global or local(buffer, window) option.
+///
+/// @param to If `type` is `SREQ_WIN` or `SREQ_BUF`, this must be a pointer
+///        to the window or buffer.
+/// @param type One of `SREQ_GLOBAL`, `SREQ_WIN` or `SREQ_BUF`
+/// @param name The option name
+/// @param[out] err Details of an error that may have occurred
+void set_option_to(void *to, int type, String name, Object value, Error *err);
+
+/// Convert a vim object to an `Object` instance, recursively expanding
+/// Arrays/Dictionaries.
+///
+/// @param obj The source object
+/// @return The converted value
+Object vim_to_object(typval_T *obj);
+
+/// Finds the pointer for a window number
+///
+/// @param window the window number
+/// @param[out] err Details of an error that may have occurred
+/// @return the window pointer
+buf_T *find_buffer(Buffer buffer, Error *err);
+
+/// Finds the pointer for a window number
+///
+/// @param window the window number
+/// @param[out] err Details of an error that may have occurred
+/// @return the window pointer
+win_T * find_window(Window window, Error *err);
+
+/// Finds the pointer for a tabpage number
+///
+/// @param tabpage the tabpage number
+/// @param[out] err Details of an error that may have occurred
+/// @return the tabpage pointer
+tabpage_T * find_tab(Tabpage tabpage, Error *err);
+
+#endif  // NEOVIM_API_HELPERS_H
+